Nidek Co., Ltd. (Manufacturer) Nidek Co., LTD (Tokyo Office)

NIDEK CO., LTD.
: 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan

(Manufacturer) Telephone: (0533) 67-6611
Facsimile: (0533) 67-6610
NIDEK CO., LTD : 6th Floor, Takahashi Bldg., No.2, 3-chome, Kanda-jinboucho
(Tokyo Office) Chiyoda-ku, Tokyo 101-0051, Japan
Telephone: (03) 3288-0571
Facsimile: (03) 3288-0570
Telex: 2226647 NIDEK J
NIDEK INCORPORATED : 47651 Westinghouse Drive, Fremont, California 94539, U. S. A.
(United States Agent) Telephone: (510) 226-5700
Facsimile: (510) 226-5750
NIDEK SOCIETE ANONYME : Europarc 13, rue Auguste Perret, 94042 CRETEIL, France
(Authorized Representative) Telephone: (01) 49 80 97 97
Facsimile: (01) 49 80 32 08
March 2006
32163-P902E
Printed in JAPAN
NIDEK
AUTO REF/KERATOMETER
Model ARK-730A
OPERATOR’S MANUAL
BEFORE USE OR MAINTENANCE, READ THIS MANUAL.
This Operator’s Manual contains information necessary for the operation of the NIDEK
AUTO REF/KERATOMETER Model ARK-730A.
This manual includes the operating procedures, safety precautions, specifications, and
information about accessories and maintenance.
The device complies with ISO 10342 (Ophthalmic devices—Eye Refractometers). IEC
60601-1 and UL 60601-1 standards are applied in this manual. The dioptric powers are
indicated with a reference of wavelength λd = 587.56 nm. This manual is necessary for
proper use. Especially, the safety precautions and operating procedures must be
thoroughly understood prior to operation of the device. Keep this manual handy for
reference.
There are no user-serviceable parts inside the device except printer paper and fuses.
Therefore, if you encounter any problems or have questions about the device, please
contact NIDEK or your authorized distributor.
MEDICAL ELECTRICAL EQUIPMENT

34VK
UL60601-1
CAN/CSA C22.2 NO. 601.1
WITH RESPECT TO ELECTRICAL SHOCK, FIRE AND
MECHANICAL HAZARDS ONLY IN ACCORDANCE WITH
UL6060l-1 AND CAN/CSA C22.2 NO. 601.1
(This applies to products whose power source is 100/120 Vac.)

Table of Contents
Page
§1 INTRODUCTION ......................................................................................................... 1-1
1.1 Outline of the Device ................................................................................................ 1-1
1.2 Indications for Use .................................................................................................... 1-1
1.3 Classifications .......................................................................................................... 1-1
1.4 Symbol Information ................................................................................................... 1-3
§2 SAFETY ......................................................................................................................... 2-1

2.1 Cautions in Storage, Transportation and Installation ................................................. 2-1
2.2 Connecting the Device to a Wall Outlet and Handling the Power Cord .................... 2-4
2.3 Cautions during Use .................................................................................................. 2-5
2.4 Maintenance .............................................................................................................. 2-9
2.5 Disposal .................................................................................................................... 2-9
2.6 Labels ..................................................................................................................... 2-10
§3 CONFIGURATION ...................................................................................................... 3-1
§4 OPERATING PROCEDURES .................................................................................... 4-1

4.1 Operation Flow ......................................................................................................... 4-1
4.2 Auto-Off Mode .......................................................................................................... 4-1
4.3 Preparation for Measurement .................................................................................... 4-2
4.4 AR (refractive error), KM (corneal curvature radius) Measurements ...................... 4-6
4.4.1 When both auto-tracking and auto-shot are ON ................................................ 4-6
4.4.2 When both auto-tracking and auto-shot are OFF ............................................ 4-14
4.4.3 When auto-tracking is ON and auto-shot is OFF ............................................ 4-16
4.5 CS (Corneal Size) Measurement ............................................................................. 4-17
4.6 PS (Pupil Size) Measurement ................................................................................. 4-19
4.7 PD (Pupillary Distance) Measurement .................................................................... 4-21
4.8 Measuring Sagittal Radius ...................................................................................... 4-23
§5 PRINTOUT ................................................................................................................... 5-1

5.1 Printing Measured Data ............................................................................................ 5-1
5.2 Eyeprint .................................................................................................................... 5-4
§6 DATA TRANSFER USING EYE CARE CARD SYSTEM ......................................... 6-1

6.1 Writing Measured Data to the Eye Care Card ........................................................... 6-1
6.2 Importing LM Data to be Used for the View Comparison Function .......................... 6-3
6.3 Erasing Data on the Eye Care Card ........................................................................... 6-4
§7 ENTERING PATIENT ID USING BARCODE SCANNER ....................................... 7-1

7.1 Connecting the Barcode Scanner ............................................................................... 7-1
7.2 Reading a Patient ID ................................................................................................. 7-2
Page
§8 VARIOUS SETTINGS .................................................................................................. 8-1
8.1 Setting Parameters .................................................................................................... 8-1
8.2 Setting Date and Time ............................................................................................. 8-10
8.3 Entering Comments ................................................................................................. 8-11
8.4 Measuring Hard Contact Lenses ............................................................................. 8-14
§9 TROUBLESHOOTING GUIDE ................................................................................. 9-1

§10 MAINTENANCE ........................................................................................................ 10-1
10.1 Replacing the Printer Paper .................................................................................. 10-1
10.2 Setting a Stack of Chinrest Paper .......................................................................... 10-3
10.3 Replacing Fuses .................................................................................................... 10-4
10.4 Cleaning the Measuring Window .......................................................................... 10-6
10.5 Cleaning the Exterior ............................................................................................ 10-7
10.6 List of Replacement Parts ..................................................................................... 10-7
§11 SPECIFICATIONS ..................................................................................................... 11-1

11.1 Specifications ....................................................................................................... 11-1
11.2 Accessories ........................................................................................................... 11-5
11.2.1 Standard accessories ................................................................................... 11-5
11.2.2 Optional accessories .................................................................................... 11-5
§12 EMC (ELECTROMAGNETIC COMPATIBILITY) ............................................... 12-1

APPENDIX A. GLOSSARY ................................................................................................... A-1
INDEX ............................................................................................................. End of this manual

[This page is intentionally left blank.]
§1 INTRODUCTION
1.1 Outline of the Device

The ARK-730A is an auto ref/keratometer which contains both a refractometer and a keratometer
in one unit. The refractometer objectively measures the refractive errors of sphere, cylinder, and
axis for the lens that corrects the patient’s vision into emmetropia. The keratometer measures
the corneal curvature radius, corneal refractive power, corneal cylindrical power, and corneal
cylinder axis. Weak infrared rays are used for these measurements.
This device has a main body and a measuring unit integrated on one base. On the base are a
chinrest on the patient’s side and a printer on the operator’s side which outputs measured results.
On the main body are a TV monitor, a control panel, and a joystick, which are used to make
alignment and perform operations. The measuring unit has a measuring window into which the
patient looks and where the infrared ray radiates on the patient’s eye. Also, there is an auto-
tracking mechanism, which automatically moves the measuring unit up, down, right, left, back
and forth to follow the eye movement, and an auto-shot function, which automatically takes
serial measurements when the device is in focus.
1.2 Indications for Use

The Auto-Ref/Keratometer ARK-730A is used to measure the refractive errors such as sphere,
cylinder and its axis as well as corneal radius of curvature of the eye. The measured values are
mainly used for the prescription of refractive correction with spectacle lenses or contact lenses.
1.3 Classifications
[Classification under the provision of 93/42/EEC (MDD)] Class IIa
The ARK-730A is classified as Class IIa.
[Form of protection against electric shock] Class I

The ARK-730A is classified as Class I.
A Class I is a device in which the protection against electric shock does not rely on basic
insulation only, but which includes an additional safety precaution in such a way that means
are provided for the connection of the device to the protective (ground) conductor in the fixed
wiring of the installation in such a way that accessible metal parts cannot become live in the
event of a failure in the basic insulation.
Use a power outlet which is equipped with a grounding terminal.
[Degree of protection against electric shock] Type B Applied Part

The ARK-730A is classified as a device with a Type B Applied Part.
A Type B Applied Part provides a particular degree of protection against electric shock,
particularly regarding the following:
- allowable leakage currents
- reliability of the protective earth connection (if present)
1-2
[Degree of protection against ingress of liquids] IP 20
The ARK-730A is classified as IP20*1.
The ARK-730A is an ordinary device, as such does not provide protection with respect to
harmful effects due to the ingress of water although it is protected against access to hazardous
parts with a solid matter such as a finger of 12.5 mm in diameter.
Avoid exposing water to the device.
[Degree of protection against flammability]

The ARK-730A is classified as a device not suitable to be used in a potentially flammable
environment.
Do not use near flammable materials.
[Method(s) of sterilization or disinfection recommended by the manufacturer]

The forehead rest and chinrest should be wiped using a cloth dampened with alcohol as
necessary.
[Mode of operation]
Classification of the ARK-730A: continuous operation
*1 In accordance with IEC 60529

1-3
1.4 Symbol Information

This symbol indicates that important descriptions are contained in the operator’s manual
and that the operator must refer to the operator’s manual prior to operation or
maintenance.
This symbol indicates that the degree of protection against electric shock is of a Type B
Applied Part.
This symbol of the power switch indicates that when the switch is pressed to this symbol
side, power is supplied to the device.
This symbol of the power switch indicates that when the switch is pressed to this symbol
side, power is not supplied to the device.
This symbol indicates the fuse rating.
This symbol indicates the input port.
This symbol indicates the output port.
This indicates that the device must be supplied only with alternating current.
This indicates the knob for adjusting the contrast.
This indicates the knob for adjusting the brightness.

§2 SAFETY
The following safety precautions should always be followed.
In this manual, a signal word is used to designate the degree or level of safety alerting.
The definition is as follows:
CAUTION: Indicates a potentially hazardous situation which, if not avoided,

may result in minor or moderate injury or property damage accident.
Even situations indicated by CAUTION may result in serious injury under certain
conditions. Safety precautions must be strictly followed at all times.
2.1 Cautions in Storage, Transportation and Installation

CAUTION
• The following environmental conditions must be maintained in storage (on the condition
that the device is packed).
- Place that is not exposed to rain or water.
- Place that is free from harmful gas or liquid.
- Place that does not contain salt, sulfur content or thick dust.
- Place that is not exposed to direct sunlight.
- Temperature: –20 to 60ºC, Humidity: 10 to 95% (Non-condensing)
• Do not drag the device by its cables.

Injury or device damage may result.
• The device must be carried by two persons with its base held with their both hands from
both sides of the device. Never hold the forehead rest, main body or measuring unit.
Injury or device damage may result if the device is carried by one person or areas other
than the base are held.
• To transport the device to another location, store it in a shipping carton. In such cases,
never lock the main body with the locking knob.
Breakdown of the device may result if it is subjected to excessive vibration or shock.
• Connect the power cord and interface cable on a stable, level place with enough space
since the power inlet and interface connectors are provided at the base of the device.
• Install the device in a place that will never be exposed to water.

If water gets into the internal structure of the device, electric shock or device malfunction
may result.
2-2
CAUTION
• The installation location must satisfy the following environmental conditions:
- Place with low dust content
- Place with less light interference
- Stable, level place that is free from vibration or shock
The device may not perform measurement properly or may malfunction. In addition, if
the device falls because of any accidental shock, injury may result.
• Install and use the device in an environment that can be maintained under the following
conditions:
Temperature: 10 to 35ºC
Humidity: 30 to 75% (Non-condensing)
Atmospheric pressure: 800 to 1060 hpa
• This device has been tested and found to comply with the limits for medical devices to the
IEC 60601-1-2: 2001, EN55011: 2000, Class B, Group 1. These limits are designed to
provide reasonable protection against harmful interference in a typical medical installation.
This device generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to other
devices in the vicinity. However, there is no guarantee that interference will not occur in
a particular installation. If this device does cause harmful interference to other devices,
which can be determined by turning the device off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
- Reorient or relocate the receiving device
- Increase the separation between the devices.
- Connect the device into an outlet on a circuit different from that to which the other
device (s) are connected.
- Consult the manufacturer or field service technician for help.
2-3
CAUTION
• In installation and operation of the device, observe the following instructions about EMC
(electromagnetic compatibility):
- Do not use the device simultaneously with other electronic equipment to avoid
electromagnetic interference with the operation of the device.
- Do not use the device near, on, or under other electronic equipment to avoid
electromagnetic interference with the operation of the device.
- Do not use the device in the same room with other equipment such as life-support
equipment, other equipment that has major affects on the life of the patient and results
of treatment, or other measurement or treatment equipment that involves small electric
current.
- Do not use the device simultaneously with portable and mobile radio frequency
communication systems because it may have an adverse effect on operation of the
device.
- Do not use cables and accessories that are not specified for the device because that
may increase the emission of electromagnetic waves from the device or the system
and decrease the immunity of the device to electromagnetic disturbance.
• The Electromagnetic Compatibility Directive sets the essential requirements for electrical
and electronic equipment that may disturb, or be disturbed by, other equipment. The
ARK-730A complies with these requirements as tabled on pages 12-1 to 12-3. Follow
the guidance in the tables for use of the device in an electromagnetic environment.
2-4
2.2 Connecting the Device to a Wall Outlet and Handling

the Power Cord
CAUTION
• Be sure to use a (HOSPITAL GRADE) wall outlet equipped with a grounding terminal in
order to avoid electric shock or fire in the event of power leak.
• Be sure to use an outlet equipped with a grounding terminal which meets the specified
power requirements.
The device may not deliver full performance, or malfunction or fire may result. In
addition, if the outlet is not equipped with a grounding terminal, there is a fear of electric
shock in the event of power leak.
• Securely connect the mains plug into an outlet.

Insecure connection may result in fire.
• To disconnect the mains plug, hold it.

If the power cord is pulled, short circuit or electric shock may result in case of break in
the wires inside the power cord.
• Never put heavy objects on the power cord nor catch the cord between any objects.
The cover of the power cord may become worn and fire or electric shock may result.
• If the metal core of the power cord is exposed, the power turns on and off by shaking the
power cord, or cord or plug gets so heated that one cannot hold it, it means that the cord
is damaged. Replace the power cord immediately.
Electric shock or fire may result.
• Wipe between the prongs of the mains plug with a dry cloth occasionally.
If dust settles between the prongs, the dust easily takes up moisture, and short circuit
and fire may result.
• If the device will not be used for a long time, disconnect the power cord from the wall
outlet.
Fire may result.
2-5
2.3 Cautions during Use

CAUTION
• Do not use the device for other than the intended purpose.
NIDEK is not responsible for accidents or malfunction caused by misuse.
• Never disassemble nor touch the inside of the device.

Electric shock or device malfunction may result.
• In advance of measurement of each patient, wipe the forehead rest and chinrest with a
clean cloth such as gauze. If necessary, wipe the forehead rest and chinrest using a cloth
dampened with rubbing alcohol.
• Keep fingerprints and dust off of the measuring window.

Reliability of the measured data may be lowered substantially.
• When the device is not in use, turn it off and place the cover over the device.
If the device is not covered, dust may accumulate and affect measurement accuracy.
• In the event of failure in the device, do not touch the inside of the device, but disconnect
the power cord from the outlet and contact NIDEK or your authorized distributor
2-6
CAUTION
• Information on the avoidance of overexposure to potentially hazardous optical radiation
(ISO 15004: 1997)
Spectrally weighted photochemical radiances LB and LA give a measure of the potential
that exists for a beam of light to cause photochemical hazard to the retina. LB gives the
measure for eyes in which the crystalline lens is in place. LA gives this measure either
for eyes in which the crystalline lens has been removed (aphakes) and has not been
replaced by a UV-blocking lens or for the eyes of very young children.
The value stated for this ophthalmic device gives a measure of hazard potential when
the device is operated at maximum intensity and maximum aperture. The values of LA
or LB for the ARK-730A are sufficiently low as shown on the following page.
The retinal exposure dose for a photochemical hazard is a product of the radiance and
the exposure time. For instance, at a radiance level of 1 mW/(cm2•sr), 240 min irradiation
of the dilated (8 mm diameter) pupil would cause the retinal exposure dose level to
attain the recommended exposure limit. If the value of radiance were reduced to 0.1
mW/(cm 2•sr), ten times that time (i.e. 2400 min) would be needed to reach the
recommended limit. The recommended exposure dose is based on calculations arising
from the American Conference of Governmental Industrial Hygienists (ACGIH) -
Threshold Limit Values for Chemical Substances and Physical Agents (1995 - 1996
edition).
The following page shows the graph of spectrum output for the ARK-730A. Patients
will be at low risk of acute optical radiation with the ARK-730A. However, it is
recommended that the intensity of light directed into the patient’s eye be limited to the
minimum level which is necessary for diagnosis. The total of the retinal exposure dose
must be carefully watched for infants, aphakes and persons with diseased eyes who are
at greater risk when other ophthalmic devices with a high level of radiance are used in
conjunction.
2-7
CAUTION
Spectrum output of all light source during AR measurement (maximum light intensity)
ARK-710A / 光放射ｴﾈﾙｷﾞｰ / AR測定時
6
放射照度：(μW/c㎡)
4
Irradiance:
0
300 400 500 600 700 800 900 1000
波長：(nm)
Wavelength:
Spectrum irradiance
*1 LA (µW/cm2/sr) 380 - 700 nm 0.788
*2 LB (µW/cm2/sr) 305 - 700 nm 0.089
Spectrum output of all light source during KM measurement (maximum light intensity)
ARK-710A / 光放射ｴﾈﾙｷﾞｰ / KM測定時
6
放射照度：(μW/c㎡)
4
Irradiance:
0
300 400 500 600 700 800 900 1000
波長：(nm)
Wavelength:
Spectrum irradiance
*1 LA (µW/cm2/sr) 380 - 700 nm 0.008
*2 LB (µW/cm2/sr) 305 - 700 nm 0.001
*1 LA: Spectrally weighted photochemical aphakic source radiance

*2 LB: Spectrally weighted photochemical phakic source radiance
2-8
{ Patient environment
The patient environment represents a space where there is a possibility of direct contact between
the patient or the operator and third person.
When another type of device is used in the patient environment, use a device that complies
with IEC 60601-1. If the devices that do not comply with IEC 60601-1 are used, it is necessary
to use an isolating transformer to power the device or to connect the devices to additional
protective grounding.
Radius of 1.5 m
2.5 m
1.5 m 1.5 m
2-9
2.4 Maintenance
CAUTION
• Before fuse replacement, turn the device off and disconnect the power cord from the wall
outlet.
Electric shock may result.
• Replace the fuses with the specified fuses only.

Fire may result.
• Never use an organic solvent such as paint thinner to wipe off the exterior.
This may ruin the surface.
• Service work should be performed only by service persons authorized by NIDEK.

NIDEK is not responsible for any accidents resulted from improper servicing.
• When the device is not in use, turn off the power switch and place a cover over the device.
If the device is not covered, dust may affect measurement accuracy.
• When the device is sent back to NIDEK for repair or maintenance, wipe the surface
(especially, the area where the patient’s skin contacts) of the device with a clean cloth
immersed in ethyl alcohol for disinfection.
• Contact NIDEK or your authorized distributor to check whether the device needs
measurement accuracy calibration if the AR-measured results are largely different from
the subjective measurements.
NIDEK is not responsible for any accidents resulted from improper servicing.
2.5 Disposal
NOTE
• Follow local governing ordinances and recycling plans regarding disposal or recycling of
device components.
The device contains the circuit board with the lithium battery. Because the disposal
method of lithium batteries varies according to the government, follow the local
governing ordinates and recycling plans when disposing of the circuit board with the
lithium battery.
• When disposing of packing materials, sort them by material and follow local governing
ordinances and recycling plans.
2 - 10
2.6 Labels
The following labels and indications are affixed to draw the operator’s attention.
or
or
(Only marketed for or

NIDEK INCORPORATED)
or
§3 CONFIGURATION
Measuring unit
Main body
TV monitor
Start button Display panel
Joystick
Memory indicator
Auxiliary button cover
Print button (clear button)
Change button Locking knob
R/K button
Base unit
IOL button
Power switch
Printer
3D auto button
UP button
View Comparison button
DOWN button
TV monitor Auxiliary button cover

Displays the patient’s eye, target, focusing in- Used to cover the buttons that are seldom
dicator, KM measured data (corneal curvature used.
radius), measurement count, and mire ring See page 3-5 for details of the buttons in-
projected on the patient’s eye. side the cover.
Display panel Locking knob

Displays measured data of AR (refractive er- Used to fix the main body to the base unit.
ror), CS (Corneal Size), PS (Pupil Size), and To lock the main body, bring it to the center
PD (Pupillary Distance) measurements. of the base unit and turn the knob counter-
SPH: Spherical power clockwise while holding it down. To tempo-
CYL: Cylindrical power rarily lock the body at any position, turn the
AXIS: Cylinder axis knob clockwise.
The R (right) or L (left) indicator shows the Do not lock the main body with this locking
eye to be measured as well as the eye of mea- knob during transportation. Otherwise, break-
sured data on the display. down of the device may result.
3-2
Used to move the guidelines on the TV moni- Used to change from AR/KM measurement
tor during CS and PS measurements. to CS/PS/PD measurement.
It is also used to change parameter settings, By pressing this button, the mode changes
date & time settings and enter comments. in the order of CS,→ PS,→ Manual PD,
→ CS... . (To change back from CS/PS/
PD measurements to AR/KM measure-
Used for the comparison function. ments, press .)
Changes the current viewing condition
(unaided eye or corrected with glasses that
the patient uses) and the viewing condi- Prints measured results.
tion corrected according to AR measure- Holding down this button for 2 seconds
ment. does not print but clears measured data.
Memory indicator
Used to check the viewing condition for near Indicates that measured data is being stored
vision. in the memory.
Pressing this button again returns the de- Illuminated: Being stored
vice to its original state. It is also used to Not illuminated: Not being stored
move the guidelines on the TV monitor Flashing: Auto-off mode
during CS and PS measurements, and
change parameter settings, date & time Joystick
settings and enter comments. Used to move the main body right, left, back
and forth.
Manipulating the lever moves the main
Changes between ON and OFF of the auto- body right, left, back and forth. Turning
tracking and auto-shot functions. the upper part of the lever moves the mea-
suring unit up and down.
Used when an IOL-implanted eye or an eye Start button

with a contact lens is measured. Used to start AR, KM, and PD measurements.
If such eyes are measured without turning It is also used to change the item number
on the IOL mode, an error may appear and of system parameters.
measurement may not be completed.
Used to change modes to select whether to

perform AR measurement and KM measure-
ment in succession or separately.
The mode changes in the order of R/K
mode (AR and KM in succession),→ R
mode (AR measurement),→ K mode (KM
measurement)→ R/K mode... .
3-3
Auto-shot ON mark
Auto-tracking ON mark
Mire ring
Cylinder mode indication

Focusing indicator
Measurement mode
Measurement count
Target
KM measurement
(Latest values)
R1: Flattest meridian
Min. pupil marker
R2: Steepest meridian
AXIS: Corneal cylinder axis [Measurement Screen]
COMPARE indication
Data to be compared with

AR-measured data
AR-measured data
SPH: Spherical power
[Screen during View Comparison] CYL: Cylindrical power
AXIS: Cylinder axis
3-4
Auto-shot ON mark COMPARE indication
Shows that the auto-shot function is active. Indicates that the View Comparison function
is active.
Shows that the auto-tracking function (up, Data to be compared with AR-measured
down, left and right) and/or auto-focusing data
function are active. “ ”⇒ Unaided eye
“LM”⇒ Patient’s glasses
Mire ring When data of the patient’s glasses is trans-
Used as a reference ring for alignment. ferred from a lensmeter, the dioptric pow-
When the auto-tracking function is on, ers of the glasses will be shown.
bring this ring close to the target so that When the patient looks at the chart with
the device automatically starts alignment. these dioptric powers, “ ” or “LM” on
When the auto-tracking function is off, the left of the monitor will flash.
place the ring concentric with the target.
The ring can also be used to observe the AR-measured data
shape of the corneal surface. Indicates median values or latest values.
When the patient looks at the chart with
Cylinder mode indication these dioptric powers, “AR” on the left of
Indicates the current cylinder mode. the TV monitor will flash.
Focusing indicator
Indicates the distance between the measuring
unit and the patient’s eye when the auto-track-
ing function is on.
Target
Used as a guide to place the patient’s eye in
the center of the TV monitor during AR and
KM measurements.
Min. pupil marker

Indicates the minimum pupil size measurable.
The device may not perform measurement
when the pupil size is smaller than this
marker or eyelashes are within this marker.
3-5
Contrast control
Brightness control
Setting button
CYL mode
change button Eyeprint button
[Auxiliary Buttons]
3-6
Contrast control
Used to adjust the contrast of the TV moni- Changes the cylinder mode, the reading di-
tor. rection of cylinder data.
+ mode ....... Cylinder data will be indicated
Brightness control by a + reading.
Used to adjust the brightness of the TV moni- – mode ........ Cylinder data will be indicated
tor. by a – reading.
MIX mode .. Cylinder data will be indicated
by a + reading when the refrac-
Used to set system parameters, date and time, tive error is positive for any me-
and enter comments. ridian. In other cases, cyl. data
will be indicated by a – read-
ing.
Prints the eyeprint view of measured data.
• The cylinder mode can be changed even af-
The eyeprint is printed out regardless of its
ter measurement.
parameter setting. It is also used to change
• Data will be printed out with the mode sta-
parameter settings, date & time settings and
tus at the time of printing.
enter comments.
3-7
Forehead rest
Measuring window
Eye level marker
LED for corneal illumination Chinrest
PD window
Chinrest knob
[Top view]
TV monitor H control
[Underside view]
TV monitor V control
Interface connectors
Power inlet Fuses
[Underside]
3-8
Measuring window side:
Patient looks at the chart through this win- Connect the interface cable from a NIDEK
dow. lensmeter to import measured data.*2
To read a patient ID using the optional barcode
Eye level marker scanner, it is connected to this side.*3
Used as a guide for the patient’s eye level for By connecting the lensmeter to the side
measurement. and the refractor to the side, LM data
The height of the chinrest should be ad- can be transferred to the refractor via the ARK.
justed so that the center of the patient’s eye Pressing the print button on the lensmeter
almost aligns with this line. starts data transfer.
Chinrest knob TV monitor H control*4

Turning the chinrest moves the chinrest up Adjusted with a screwdriver when the TV moni-
and down. Use the eye level marker as a guide tor does not lock horizontally. Can be found on
to adjust the patient’s eye level to a comfort- the underside of the main body.
able height for measurement.
TV monitor V control*4
Interface connectors*1 Adjusted with a screwdriver when the TV moni-
side: tor does not lock vertically. Can be found on
Connect the interface cable to transfer measured the underside of the main body.
data to a NIDEK refractor. The optional Eye
Care card system is connected to this side.
*1 Accessory equipment connected to the analog and digital interfaces must be certified according
to the representative appropriate national standards (for example, UL 1950 for Data Processing
Equipment UL 60601-1 for Medical Equipment, and CSA C22.2 No. 601-1, EN 60601-1, and
IEC 60601-1.) Furthermore, all configurations shall comply with the system standard IEC
60601-1-1. Anyone who connects additional equipment to the signal input part or signal output
part configures a medical system, and is therefore responsible that the system complies with
the requirements of the system standard IEC 60601-1-1. If in doubt, consult the technical
service department or your local representative.
*2 When communicating with a lensmeter, set communication parameters for each device as
follows: For the setting procedure, see the Operator’s Manual of each device.
• ARK-730A • NIDEK Lensmeter
53: Baud Rate = 9600 RS-232C = NIDEK Data Bits = 8
54: Bit Length = 8 Baud Rate = 9600 Stop Bits = 1
56: IN Port Sel. = LM Parity = Odd
*3 When connecting the optional barcode scanner, set parameters as follows: See “8.1 Setting Parameters”
(p. 8-1).
53: Baud Rate = 9600
54: Bit Length = 8
56: IN Port Sel. = Barcode
*4 The LCD type monitor is not provided with these controls.

§4 OPERATING PROCEDURES
4.1 Operation Flow

Power ON
4.3 Preparation for Measurement (p. 4-2)
Measurements
→4.4 AR (refractive error), KM (corneal curvature radius) Measurements

→4.4.1 When both auto-tracking and auto-shot are ON (p. 4-6)
→4.4.2 When both auto-tracking and auto-shot are OFF (p. 4-14)
→4.4.3 When auto-tracking is ON and auto-shot is OFF (p. 4-16)
→4.5 CS (Corneal Size) Measurement (p. 4-17)
→4.6 PS (Pupil Size) Measurement (p. 4-19)
→4.7 PD (Pupillary Distance) Measurement (p. 4-21)
→4.8 Measuring Sagittal Radius (p. 4-23)
5. PRINT OUT (p. 5-1)
Power OFF
(Determine final prescription by subjective refraction.)
4.2 Auto-Off Mode

The device will go into the auto-off mode automatically to save power if no operation is performed
for five minutes*1. OFF
The auto-off mode places the device into the
following conditions: Time
• The TV monitor goes off.
Flashing
• Time appears on the display panel.
• The memory indicator flashes.
The device recovers to the normal mode from the auto-off mode by the following methods:
• Press any switch.
• Manipulate the joystick to move the base R or L.
NOTE
• The device may not go into the auto-off mode depending on the condition of the screen.
• When the device goes into the auto-off mode from the Comparison View function
screen, it will recover to the normal mode. (Only when the “Compare SW” parameter
is set to “Manu.”)
• When the device goes into the auto-off mode from the screen of CS, PS or PD
measurement, it will recover to the normal mode.
*1 Time to activate the auto-off mode can be changed. The parameter setting can be set so that the
auto-off mode will not activate. See “8.1 Setting Parameters” (p. 8-1).
4-2
4.3 Preparation for Measurement Auto-shot ON mark
1. Turn on the power switch.

The display panel is indicated as shown on the
right. On the TV monitor are the target,
focusing indicator and min. pupil marker in the
center, auto-tracking ON mark, and auto-shot
ON mark in the upper center, cylinder mode on
the upper right, and measurement count on the
lower left.
Min. pupil marker
Focusing indicator
Target
When the power is turned on, the main body

makes small right/left movements in order to
determine the initial setting position for auto-
tracking. This does not mean that the device
has been broken.
NOTE
• If “<PD ERR>” is shown on the left side
of the TV monitor, the device may not
recognize the left eye or right eye
(measurement may not be performed
binocularly), and also the PD (pupillary
distance) may not be measured. Check
the PD window. If the PD window is
covered by anything, remove it. If
covered by dust, wipe lightly with a swab
with a little alcohol to clean it. PD window
If “<PD ERR>” is still shown on the
monitor even after performing the
corrections described above, install the
device in a low light interference
environment since the error may have
occurred due to light interference.
NOTE
• “Err” will appear on the display panel if the power is turned on with no printer paper
set.
To correct the condition, turn on the power switch again after setting the printer
paper.
4-3
2. Open the auxiliary button cover and set measurement conditions.
The cover can be opened by sliding it to the
left.
a. :
See “6. VARIOUS SETTINGS” for details of
setting parameters.
b. :
Set the cylinder mode, indication of cylinder
reading direction.
CYL +..... Indicates cylindrical power by a + reading.
CYL – ..... Indicates cylindrical power by a – reading.
CYL ±..... Indicates the cylindrical power by a + reading when the refractive error is positive
(MIX) for any meridian. Indicates the cylindrical power by a – reading in other cases.
* The cylinder mode can be changed even after measurement.
* Data will be printed out with the mode status at the time of printing.
* When the cylinder mode is set to CYL+, the AXIS value of KM measurement indicates the
angle of the steepest meridian. In other cases (CYL–, CYL±), the AXIS value indicates the
angle of the flattest meridian.
4-4
3. Press to select the measurement mode.
The mode changes in the order of R/K→ R→ K→ R/K... .
R/K mode ............. AR/KM measurement in succession
R mode ................. AR measurement
K mode ................. KM measurement
4. If you are AR-measuring an IOL-implanted eye or an eye with a contact lens, turn on the
IOL mode by pressing .
The IOL ON mark will appear on the top left of the TV monitor.
NOTE
IOL ON mark
• When an IOL-implanted eye or an eye
with a contact lens is measured, the IOL
mode must be turned on. If such eyes are
measured without turning on the IOL
mode, an error message may appear and
measurement may not be completed.
• The IOL mode will automatically turn off

by sliding the main body or after printout.
• The IOL mode will automatically turn on

when a measurement error has occurred
three times in a row. (Auto IOL*2)
5. Prepare the patient.
1) Clean the forehead rest and chinrest with clean gauze.

If a stack of chinrest paper is fixed to the chinrest, remove one sheet of paper.
2) Instruct the patient to take off his/her glasses or contact lenses and have a seat.
*2 <Auto IOL>
See “8.1 Setting Parameters” for details of setting parameters.
4-5
3) Instruct the patient to place his/her chin on
the chinrest and forehead on the forehead
rest.
Eye level marker
Chinrest knob
4) Adjust the height of the chinrest by turning

the chinrest knob until the center of the
patient’s eye aligns with the eye level
marker.
NOTE
• To relax the patient, explain as follows before measurement. “This device measures
your eye with an infrared ray to find which kind of lens fits you. The infrared ray does
no harm to your eyes.”
4-6
4.4 AR (refractive error), KM (corneal curvature radius)

Measurements
4.4.1 When both auto-tracking and auto-shot are ON

Alignment and focusing are automatically performed and measurement starts when in the optimum
position. When the auto-tracking function is ON, auto-focusing is also performed.
1. Make sure that (auto-shot ON mark) and (auto-tracking ON mark) are shown on
the upper part of the TV monitor.
When they are not shown, press to turn on the auto-tracking and auto-shot functions.
2. Perform rough alignment.
1) Instruct the patient to: “Look through the measuring window. As you will see a picture of a
balloon, watch the center of it without straining.
2) Manipulate the joystick to place the patient’s eye onto the TV monitor.
By moving the joystick laterally, the main body moves right, left, back and forth. By turning
the upper part of the joystick, the main body moves up and down. Align the eye position to
the measuring point with right, left, up and down movements. Adjust the focus with back
and forth movements.
NOTE
• If the mire ring is not in the center of the pupil and the min. pupil marker is on the iris,
turn off the auto-tracking function and bring the min. pupil mark into the center of the
pupil to perform measurement, ignoring the mire ring.
• Auto-tracking or auto-shot may not work on keratoconus or postoperative cornea. In

such a case, turn off the auto-tracking and auto-shot functions. See “4.4.2 When both
auto-tracking and auto-shot are OFF” (p. 4-14).
4-7
3. Bring the mire ring close to the target so that the device starts alignment automatically.
The auto-tracking function does not work unless the mire ring is at around the center of the
measurement field. If the ring is too far off the center, manipulate the joystick to move it in.
When the position of the mire ring gets out of the working range of auto-tracking, “<LIMIT>”
appears on the left. In such a case, either manipulate the joystick in the direction of the arrows
or pull the joystick forward once and perform alignment again.
↑: Turn the grip of the joystick clockwise.

↓: Turn the grip of the joystick counterclockwise.
→: Tilt the joystick slightly to the right.
←: Tilt the joystick slightly to the left.
: Push the joystick backward.
: Pull the joystick forward.
Move the joystick back and forth until the

focusing indicator shows the optimum state
“ ”.
Too close to the patient’s eye
Pull the joystick forward to move the main body away from the
patient’s eye.
Optimum state
Push the joystick backward to move the main body toward the patient’s
eye.
Too far from the patient’s eye
NOTE
• Measurement starts automatically when the device is properly aligned and in focus.
• The device may not perform correct measurement when the eyelashes are within the
min. pupil marker. In such cases, instruct the patient to open his/her eye wider. If the
patient cannot open wider, lift the patient’s eyelid, paying attention not to press against
the eyeball.
4-8
4. Measurement starts automatically when the device is properly aligned and in focus.
NOTE
• Instruct the patient not to blink during measurement.
• The operator can start measurement by pressing the start button.

Press the start button to start measurement when measurement has difficulty starting
for patients who blink often.
• When an error or erroneous data*3 appears,

the cause may be one of those described
below. If those signs appear again after
repeating measurement, check the
following:
a. Patient blinked during measurement.
b. The eyelid or eyelashes are within the min. pupil marker.
c. The patient’s pupil is smaller than the min. pupil marker. (Have the patient sit in
a dark room for a while and wait until the pupil diameter becomes large enough
for measurement.)
d. Retinal reflection is extremely low due to an optical condition such as a cataract.
e. There is some unusual reflection on the cornea during measurement. (In this case,
measurement may not be performed unless the IOL mode ( ) is on.)
f. There is extreme distortion of the cornea.
A. When the measurement mode is set to <<R/K>>:
A short beep is heard.
KM measurement starts.
The measurement count will be shown on the TV monitor.
When the median values are obtained and then KM measurement is completed, the latest values
of the KM-measured data will be shown on the TV monitor.
A short beep is heard again.
The patient’s view is fogged.
*3 <Erroneous data>
Data in which the confidence index of AR measurement is “E”. See “8.1 Setting Parameters”.
4-9
AR measurement starts.
A long beep will be heard and the measurement count will be shown on the TV monitor.
When the median values are obtained,

measurement will be completed.
“<FINISH>” will appear on the left of the TV
monitor. The latest values are always shown
on the display panel.
* When the “Compare SW” parameter is set

to “Auto”, the screen will change to the View
Comparison function screen after
measurement.
NOTE
• The AI mode*4 is automatically activated regardless of its parameter setting and
measurement starts in the High-speed mode*5 without pressing the start button.
• If “Error Data” of the parameter is set to “YES” and there are no variations in the three
measurements, measurement will be completed. If there is erroneous data (confidence
coefficient=E) in the measurements, the median value will not be obtained.
• To continue AR measurement, pressing the start button clears “<FINISH>” and restarts
auto-tracking and measurement (except when the “Compare SW” parameter or “Print”
parameter is set to “Auto”).
• The device can store up to 10 measurements each for the right and left eyes. If
measurements exceed 10, the oldest data will be cleared in order.
⇒ Go on to step 5 (p. 4-11).
*4 <AI mode>
This is a mode in which AR/KM measurement is completed as soon as the median values are
obtained.
*5 <High-speed mode>
This mode allows continuous AR measurement with the fogging maintained from the second
measurement. See “8.1 Setting Parameters” for details of setting parameters.
4 - 10
B. When the measurement mode is set to <<R>>:
AR measurement starts.
A long beep will be heard and the measurement count will be shown on the TV monitor.
When the median values are obtained,

“<FINISH>” will appear on the left of the TV
monitor. The latest values are always shown
on the display panel.
* When the “Compare SW” parameter is set

to “Auto”, the screen will change to the View
Comparison function screen after
measurement.
NOTE
• To continue AR measurement, pressing the start button clears “<FINISH>” and restarts
auto-tracking and measurement (except when the “Compare SW” parameter or “Print”
parameter is set to “Auto”).
⇒ Go on to step 5 (p. 4-11).

4 - 11
C. When the measurement mode is set to <<K>>:
KM measurement starts.
The measurement count will be shown on
the TV monitor.
When the median values are obtained, KM

The latest values of KM-measured data will
be shown on the TV monitor.
⇒ Go on to step 7 (p. 4-13).
5. If necessary, change the patient’s viewing condition using the View Comparison function
(only when AR measurement has been performed).
The View Comparison function allows the patient to compare the current viewing condition
(unaided eye or corrected with glasses that the patient uses) and the viewing condition corrected
according to AR measurement. By changing the distance to the chart, the patient can also
check the viewing condition for near vision.
Step 5 can be performed after both eyes are measured.
1) Press to set the viewing condition

corrected according to AR measurement.
T h e m o n i t o r w i l l s h o w t h e Vi e w
Comparison function screen.
“AR” flashes, which indicates the viewing
condition corrected according to AR
measurement. When the “Compare SW”
parameter is set to “Auto”, the monitor will
show the View Comparison function screen
automatically as soon as the median values
are obtained.
Flashing indicates the current viewing condition.
“ ” flashes: View without correction (unaided eye)
“LM” flashes: View corrected with glasses that the
patient uses
“AR” flashes: View corrected according to AR
measurement
4 - 12
2) Press again to set the viewing condition without correction (unaided eye).
“ ” flashes, which indicates the viewing condition without correction.
If data of the patient’s glasses has been transferred from a NIDEK lens meter, “LM” will
flash instead of “ ” and the patient can experience the viewing condition corrected with
his/her glasses. The optional interface cable is required for data transfer.
3) Change the current viewing condition (unaided eye or corrected with glasses that the patient
uses) and the viewing condition corrected according to AR measurement by pressing to
allow the patient to recognize the variation between them.
NOTE
• The dioptric power that the patient can
experience during the View Comparison
function includes only spherical
component, not cylindrical component.
Therefore, spherical equivalent (SE value) Sample of spherical equivalent
or highest power (spherical power and

cylindrical power) is used instead of actual
AR-measured data. The dioptric power
to be used is shown on the display panel. Sample of highest power
Whether to use spherical equivalent or highest power can be selected by the “Compare
(AR)” parameter.
Spherical equivalent is used for the viewing condition with data of the patient’s glasses
transferred from a lensmeter.
• The View Comparison function must be performed with the target aligned in every
direction and in focus, as well as in measurement. When the target is misaligned,
perform alignment and focusing again, following step 3.
• If the patient’s eye is hyperopic, the view does not change as much compared with a
myopic eye. This is because the patient can see the chart with accommodation even
with the unaided eye (“ ” flashing).
4 - 13
6. If necessary, change the patient’s viewing condition for near vision.
1) Set the condition that “AR” flashes.
2) Press .
The working distance to the chart will
change from the normal distance (5 m-
equivalent) to 35 cm-equivalent*6. “
35CM” will appear on the left of the TV
monitor. The patient can experience the
viewing condition corrected according to
AR measurement for near vision. Pressing
again will return the working distance
to the normal distance (5 m-equivalent).
Pressing with “ ” (or “LM”) flashing allows the patient to experience the viewing
condition without correction (unaided eye).
3) Pressing the start button with “ 35CM”

shown adds the addition power of 1.75D*7.
“ADD1.75D” will appear on the left side of
the TV monitor. The patient can know
whether the addition power needs to be
added with bifocal lenses or progressive
lenses.
Pressing the start button again cancels the

addition power.
If the chart distance returns to the normal distance (5 m-equivalent) by pressing , the
addition power will be cleared.
If the viewing condition is changed between AR measurement and the unaided eye by pressing
, the addition power will be cleared.
7. Measure the other eye in the same manner.
8. Press .
See “5.1 Printing Measured Data” (p. 5-1).
Measured data will be printed out and the View Comparison function screen will return to the
normal measurement screen.
*6 The near working distance of the chart can be set between 35 and 70 cm (5 cm increments) or
14 and 28 inches (2 inch increments) using the parameter.
*7 The addition power can be selected from the parameter settings of 1.5D, 1.75D, and 2.0D.
4 - 14
4.4.2 When both auto-tracking and auto-shot are OFF

1. Make sure that (auto-shot ON mark) and (auto-tracking ON mark) are not shown
on the upper part of the TV monitor.
When they are shown, press to turn off the auto-tracking and auto-shot functions. When
the auto-tracking function is off, auto-focusing is not also performed.
2. Perform rough alignment.
1) Instruct the patient to: “Look through the measuring window. As you will see a picture of a
balloon, watch the center of it without straining.
2) Manipulate the joystick to place the patient’s

eye on the TV monitor.
By moving the joystick laterally, the main
body moves right, left, back and forth. By
turning the upper part of the joystick, the
main body moves up and down. Align the
eye position to the measuring point with
right, left, up and down movements. Adjust
the focus with back and forth movements.
Min. pupil marker Target Mire ring
NOTE
• If the mire ring is not in the center of the pupil and the min. pupil marker is on the iris,
bring the min. pupil marker into the center of the pupil to perform measurement, ignoring
the mire ring.
3) Adjust the focus by moving the joystick back and forth so that the mire ring becomes
minimum.
NOTE
• The device may not perform correct measurement when the eyelashes are within the
min. pupil marker. In such cases, instruct the patient to open his/her eye wider. If the
patient cannot open wider, lift the patient’s lid, paying attention not to press against the
eyeball.
3. Start measurement.
Press the start button.
4 - 15
NOTE
• Instruct the patient not to blink during measurement.
• When the “AI Mode” parameter is set to “NO”, take about three shots for AR
measurement. If the measured data is not stable, take some additional shots.
• When an error or erroneous data appears,

the cause may be one of those described
below. If those signs appear again after
repeating measurement, check the
following:
a. Patient blinked during measurement.
b. The eyelid or eyelashes are within the min. pupil marker.
c. The patient’s pupil is smaller than the min. pupil marker. (Have the patient sit in
a dark room for a while and wait until the pupil diameter becomes large enough
for measurement.)
d. Retinal reflection is extremely low due to an optical condition such as a cataract.
e. There is some unusual reflection on the cornea during measurement. (In this case,
measurement may not be performed unless the IOL mode ( ) is on.)
f. There is extreme distortion of the cornea.
The measuring procedure is the same as “A: When the measurement mode is set to <<R/K>>”
(p. 4-8), “When the measurement mode is set to <<R>>” (p. 4-10) and “When the measurement
mode is set to <<K>>” (p. 4-11). However, the timing when AR or KM measurement is completed
differs from when both auto-tracking and auto-shot functions are ON.
When the “AI Mode” parameter is set to “YES”:
KM measurement; Measurement is performed until median values are obtained.
AR measurement; If there are not any variations in the three measurements, measurement
ends.
When the “AI Mode” parameter is set to “NO”:
KM measurement; Three measurements are performed in succession. The number of
measurements can be set in the parameter.
AR measurement; Serial measurement is performed while the start button is being pressed.
4. If necessary, change the patient’s viewing condition.

See steps 5 - 6 of “4.4.1 When both auto-tracking and auto-shot are ON” (p. 4-11).
6. Press .
4 - 16
4.4.3 When auto-tracking is ON and auto-shot is OFF

This is a method by which alignment and focusing are automatically performed and the operator
determines the measurement timing by pressing the start button.
1. Make sure that (auto-tracking ON mark) is shown and (auto-shot ON mark) is not
shown on the upper part of the TV monitor.
When the screen is not shown as described above, press to change the setting. (The “Tracking
SW” parameter must be set to “T&S/T/M” or “T/M” in advance.)
2. Perform rough alignment and focusing.

See steps 2 - 3 of “4.4.1 When both auto-
tracking and auto-shot are ON” (p. 4-6).
3. Start measurement.
See step 3 of “4.4.2 When both auto-tracking and auto-shot are OFF” (p. 4-14).
4. If necessary, change the patient’s viewing condition.

See steps 5 - 6 of “4.4.1 When both auto-tracking and auto-shot are ON” (p. 4-11).
6. Press .
4 - 17
4.5 CS (Corneal Size) Measurement

Reference line Guide line
1. Press .
“<<CORNEAL SIZE>>”, a reference line, and
a guide line will appear on the TV monitor. The
display panel shows “12.0” which is the default
of CS measurement.
The mode changes as follows for every pressing

of .
AR/KM → CS → PS → PD
↑
2. Manipulate the joystick to align the reference

line with the left side of the patient’s cornea.
3. Move the joystick back and forth to focus

the mire ring.
NOTE
• If the left side of the cornea is out of
alignment, repeat step 2.
4. Move the guide line on the right of the TV

monitor with or to align it with the
right side of the patient’s cornea.
...............The guide line moves to the right.
(The display panel indication increases.)
...............The guide line moves to the left.
(The display panel indication decreases.)
NOTE
• The indication changes in increments of
0.5 mm.
5. Press the start button.

Measured data will be entered.
4 - 18
NOTE
• When the “AI Mode” parameter is set to “YES” and “Print” parameter to “Auto”, CS
measurement must be performed before AR/KM measurement in order to print data
together with AR/KM results.
7. To go on to AR/KM measurement, press .

To go on to PS measurement...................... Press once.
To go on to PD measurement ..................... Press twice.
4 - 19
4.6 PS (Pupil Size) Measurement

Reference line Guide line
1. Press .
(From CS measurement, press once; from AR/
KM measurement, press twice.)
“<<PUPIL SIZE>>”, a reference line, and a
guide line will appear on the TV monitor. The
display panel shows “5.0” which is the default
of PS measurement.
2. When the pupil size is measured in a dark

place, turn off the chart-illuminating lamp
in the measuring window.
Press to turn on or off the chart-illuminating
lamp.
When the chart-illuminating lamp is off,
“LAMP=OFF” will be shown under “<<PUPIL
SIZE>>”. Instruct the patient not to look round
and watch ahead without straining.
3. Manipulate the joystick to align the reference

line with the left side of the patient’s pupil.

the mire ring.
NOTE
• If the left side of the pupil is out of
alignment, repeat step 3.
5. Move the guide line on the right of the TV

monitor with or to align it with the
right side of the patient’s pupil.
..... The guide line moves to the right.
(The display panel indication increases.)
..... The guide line moves to the left.
(The display panel indication decreases.)
NOTE
• The indication changes in increments of
0.5 mm.
4 - 20
Measured data will be entered.
NOTE
• When the “AI Mode” parameter is set to “YES” and “Print” parameter to “Auto”, PS
measurement must be performed before AR/KM measurement in order to print data
together with AR/KM results.
8. To go on to AR/KM measurement, press .

To go on to PD measurement ..................... Press once.
To go on to CS measurement ..................... Press twice.
4 - 21
4.7 PD (Pupillary Distance) Measurement

A. Auto-PD measurement (when the “Auto-PD” parameter is set to “YES”)
At the moment where measurement of both eyes
is completed, PD measurement will have been
completed. The near PD will be automatically
calculated.
PD (Pupillary Distance)
NOTE
• PD value is printed out with measured data.
• The calculated near PD is not shown on the display panel but printed out with AR-
measured data (only when the “Near PD” parameter is set to “YES”).
B. Manual PD measurement (when the “Auto-PD” parameter is set to “NO”)
1. Press .
(From CS measurement, press once; from AR/
KM measurement, press twice.)
Indications for PD measurement will appear on
the display panel.
2. Instruct the patient not to move his/her head

and eyes during measurement.
3. After proper alignment of the right eye and

left eye, press the start button each time.
NOTE
• If the patient’s head is tilted, straighten it before starting measurement.
• To measure monocular PD at the same time as the binocular PD, press the start button
every after proper alignment of the right-eye, center, and the left-eye.
To press the start button in the exact center position, have a patient wear the frames
with a mark on its center and bring the mark in focus.
It is recommendable to use the pupillary distance meter such as the NIDEK PM-600 in
order to obtain precise monocular PD.
4 - 22
NOTE
• The r (right), c (center), and l (left) signs on the display panel disappear in turn as the
start button is pressed to show that detection of each position has been completed.
4. When measurement is completed, measured data will be shown on the display panel.
4 - 23
4.8 Measuring Sagittal Radius

1. Set the “Sagittal”parameter to “YES”.
See “6.1 Setting Parameters” for the procedure.
NOTE
• If the “Print” parameter has been set to
“Auto”, it must be set back to “Manu.”.
2. On condition that KM measurement has

been made, press .
The measurement mode will change to the
sagittal radius measurement mode: The
indications of “L” (Left), “R” (Right), “U” (Up),
and “D” (Down) will appear and “L” will flash
to show the position of the illuminated fixation
light that the patient will look at.
NOTE
• The median KM values or the latest KM
values will be shown on the TV monitor.
• To quit sagittal radius measurement, press

.
3. Instruct the patient to look at the red light

on the left side and not to move his/her head.
4. Manipulate the joystick to place the mire

ring concentric with the target.

the mire ring until it becomes its thinnest.
4 - 24
The sagittal radius of the right part of the cornea
will be measured.
“L” changes to “*”, then “R” starts flashing.
NOTE
• If measurement is erroneous, “L” changes
to “E (Error)” and then “NEXT→ ”
appears. In such a case, repeat
measurement by pressing the start button.
If “E” remains after repeating
measurement, press to proceed to the
“R” side.
7. Instruct the patient to look at the red light

on the right hand side and repeat steps 4 - 6
for the sagittal radius of the left side of the
eye.
8. Perform measurement of the “D” (Down)

and “U” (Up) sides in the same manner.
When all four measurements for a single eye
are completed, an eccentricity value (E=) will
appear and the mode will return to the R/K
mode.
NOTE
• Median values of each side (L, R, U and D) are individually obtained by the serial
measurement, and the eccentricity data will be obtained by calculation on the basis of
the median values for the 4 sides and KM measurement (either the median values or
latest values). When the “Sagit Axis” parameter is set to “AXIS”, these values will be
converted for the angle of the steepest meridian which has been obtained by KM
measurement.
• Concerning the side at which “E” is indicated, the value of the opposite side on the
same meridian will be used for the calculation of eccentricity.
• If the eccentricity is indicated as “E = Err”, press to repeat measurement. Repeating

measurement, however, clears the former data.
4 - 25
9. Repeat the same procedure for the right eye.
It is possible to start binocular sagittal radius measurement after KM measurement of both eyes
have been completed.
10. Press to print sagittal radius measurement.
NOTE
• If KM measurement is performed once again without pressing after sagittal radius
measurement, the eccentricity data will be recalculated according to the new KM median
value, which is based on the stored former data and the newly measured data. When
measuring an additional patient, be sure to press the print button beforehand to print
and clear data.
* The following are sample printouts for the left eye and explanations of each item of data.
< Sample printout 1 >

* This is the printout for when the “Sagit Print” parameter is set to “Short”.
4 - 26
< Sample printout 2 >
* This is the printout for when “Sagit Print” parameter is set to “All”.
< SAGITTAL > = Sagittal radius of each side

SUP. = Superior side
INF. = Inferior side
TEM. = Temporal side
NAS. = Nasal side
A = Axis of the steepest meridian (of KM mea-
surement)
(F = Fixation Angle)
S = Sagittal data obtained by adding the dRo value
to or subtracting it from the sagittal radius values
e = Eccentricity values of each sagittal radius
eh = Eccentricity on the horizontal meridian
ev = Eccentricity on the vertical meridian
E = Total Eccentricity
ASTc = Corneal cylinder at the center
ASTp = Corneal cylinder at the periphery
Rh = Average of corneal curvature on the horizontal
meridian
Rv = Average of corneal curvature on the vertical
meridian
Ro = Average of corneal curvature at the center
dRo = Difference of corneal curvature between R1
and R2
dAST = Difference of corneal cylinder between the
center and the periphery
§5 PRINTOUT
5.1 Printing Measured Data

Measured data will be printed out by pressing after measurement.
NOTE
• When the “Print” parameter is set to “Auto”, printing will start automatically as soon
as both eyes are measured (FINISH).
• Do not touch the printer paper while measured data is printed out. A loss of text and
lightly printed text may result.
• The memory indicator is illuminated while measured data is being stored in the memory.
As long as the indicator is illuminated, data can be printed any number of times.
• After printing, the existing data will automatically be cleared when the next
measurement has begun. If the “Print & CLR” parameter is set to “YES”, data will
automatically be cleared right after printing.
• When the memory indicator is illuminated, holding down for approximately 2
seconds clears the existing data completely.
• When the memory indicator is not illuminated, serves to feed the paper.
<Sample Printout 1>
Memory indicator
NOTE
• This sample shows the printout performed on the condition that the parameters related
to printout have not been changed since shipment (factory-settings).
5-2
< Sample Printout 2 >
Description of printed contents
Patient number
Space for name and sex
Date and time of measurement
Vertex distance*1
Near working distance*2
AR measurement, Confidence index*3

S = Spherical power, C = Cylindrical power, A = Cylinder axis
AR median values*4
SE value*5
Eyeprint*6
Trial lens data*7

CL conversion values*8
KM measurement
R1 = Flattest meridian, R2 = Steepest meridian
AVE = Average of R1 and R2
CYL = Corneal cylindrical power
deg = Corneal cylinder axis
KM median values*9
CS measurement,
PS measurement (ON or OFF of the lamp during PS measurement)
Measurable range over error*10
Pupillary distance: Distance PD, (Monocular PD), Near PD*11

Comment*12
NOTE
• Whether or not to include the data with in the above printout “Sample Printout 2”
can be set by the parameters No. 24 to 37.
5-3
*1 < Vertex distance >
The distance between the corneal vertex to the posterior surface of a spectacle lens.
*2 < Near working distance >

Used for near PD calculation. Changeable in the 35 to 70 cm range by the corresponding
parameter.
*3 < Confidence index >

One of six steps (9, 8, 7, 6, 5, or E) is printed out. “E” stands for erroneous data. For information,
when the “IOL (*) Mark” parameter is set to “YES” and AR measurement is performed with
on, measured data on printout will be marked with “*” just before the confidence index.
*4 < AR median values >

Printed out when three or more AR measurements (except for errors) are in the memory.
*5 < SE (Spherical Equivalent) value >

Calculated for the median values (or the latest values when the median values have not been
obtained) and CL conversion value.
*6 < Eyeprint >

Tells graphically the patient’s refractive status based on the median value. The eyeprint has 8
patterns.
• Emmetropia • Astigmatism • Simple myopic astigmatism
• Myopia • Myopic astigmatism • Simple hyperopic astigmatism
• Hyperopia • Hyperopic astigmatism

5-4
*7 < Trial lens data >
Based on the AR median values, the cylinder reading direction is automatically converted so
that a spherical trial lens will have lower power as reference data.
*8 < CL conversion values >

The AR median values are converted into CL values, letting the vertex distance (VD) be 0 mm.
*9 < KM median values >

Printed out when three or more KM measurements (except for errors) are in the memory.
*10 < Measurable range over error >

Err +o .................. The spherical power is over the measurable limit of the + side.
Err –o................... The spherical power is over the measurable limit of the – side.
Err co ................... The cylindrical power is over the measurable limit.
When the “Error Code” parameter is set to “YES”, the error code will be printed out as soon as
an error occurs.
*11 < Near PD >

PD for a near working distance of 35 cm (factory-setting). Use it for prescriptions of reading
glasses or bifocals.
*12 < Comment >

It is possible to enter desired letters or symbols on the printout. For the procedure of entering
comments, see “8.3 Entering Comments”.
5.2 Eyeprint
Aside from normal printouts, serves to print
the eyeprint and PD value only based on the
median values or latest values. The eyeprint will
be printed out regardless of the parameter
settings. It will help you to explain to the patient
the refractive condition of his or her eyes. The
Eyeprint has 8 patterns, the same as those on the
normal printout described in “5.1 Printing
Measured Data”.
§6 DATA TRANSFER USING EYE CARE CARD SYSTEM
Data transfer via the Eye Care card using the optional Eye Care card system “EyeCa-RW” is
explained.
The Eye Care card system should be connected to the interface connector for output ( ) provided
at the bottom of the device. As for the DIP switch settings, only set SW3 of the DIP switchpack
of the Eye Care card system located at the bottom to the “ON” position.
6.1 Writing Measured Data to the Eye Care Card

The procedures for writing AR-(objectively-)measured data to the Eye Care card using the Eye
Care card system “EyeCa-RW” that is connected to the ARK-730A is explained. (If KM
measurement has been performed, KM-measured data will also be written.) With the following
procedures, objectively-measured data is transferred to an AUTO OPTOMETRY SYSTEM via
the Eye Care card.
In the case of AUTO OPTOMETRY SYSTEM COS-550
Objectively
measured data
EyeCa-RW
Eye Care card
EyeCa-RW
Auto Ref/Keratometer
ARK-730A
There are two methods of writing objectively-measured data to the Eye Care card:
<When it is necessary to print the data>

1. Insert the Eye Care card into the ARK-730A
on the condition that no measured data is in Access indicator
the memory of the device.
The EyeCa-RW will emit a short beep and the
access indicator will illuminate in green.
If no measured data is in the memory of the
ARK-730A, the memory indicator of the ARK-
730A is off.
2. Perform measurement.
3. Press .
The measured data will be printed out.
The access indicator will illuminate in orange and the data will be written to the Eye Care card.
After the data has been written successfully, the EyeCa-RW will emit a short beep and the
access indicator will flash in green.
4. When the orange access indicator changes to the green flashing one, remove the Eye Care
card.
6-2
<When it is unnecessary to print the data>
Set the “Print” parameter to “Manu.” or “NO” in advance.
1. After measurement, insert the Eye Care card.

The EyeCa-RW will emit a short beep and the access indicator will illuminate in green. Then
the green access indicator will change to the orange one, and the data will be written to the Eye
Care card. After the data has been written successfully, the EyeCa-RW will emit a short beep
and the access indicator will flash in green.
2. When the orange access indicator changes to the green flashing one, remove the Eye Care
card.
The data in the memory of the ARK-730A will be cleared when the next measurement has
begun.
CAUTION
• Never remove an Eye Care card while it is being accessed.
While the card is being accessed, the access indicator will illuminate in orange.
The access indicator flashing in orange indicates an error occurrence. In this case,
the operator is only allowed to remove the card.
When trying to remove the card while it is being accessed, data will not be written
successfully and the Eye Care card may be irreparably damaged.
6-3
6.2ImportingLMDatatobeUsedfortheViewComparisonFunction
Import LM data (data of glasses that the patient uses) to the ARK-730A by inserting the Eye
Care card with the LM data written to into the Eye Care card system “EyeCa-RW” that is connected
to the ARK-730A. The imported data is then used for allowing the patient to experience the
viewing condition with his or her glasses instead of unaided eyes using the View Comparison
function.
* Set the “EyeCareC (LM)” parameter to “YES” in advance.
In the case of AUTO OPTOMETRY SYSTEM COS-550
Objectively LM data
measured data
LM data
Eye Care card
EyeCa-RW
Eye Care card
[Operation (A)]
(A)
[Operation (B)]
EyeCa-RW EyeCa-RW
Auto Ref/Keratometer Lensmeter

ARK-730A
[Operation (A)] ⇒ Insert the Eye Care card. The LM data will
automatically be imported to the ARK-730A.
[Operation (B)] ⇒ See “6.1 Writing Measured Data to the Eye
Care Card”.
As for the procedure of writing data measured by the ARK-730A to the Eye Care card, see
“6.1 Writing Measured Data to the Eye Care Card”.
As for importing of LM data, it will automatically start as soon as the Eye Care card with
LM data written by the EyeCa-RW that is connected to the lensmeter is inserted into the
EyeCa-RW that is connected to the ARK-730A. In this case, the LM data in the Eye Care
card will not be erased.
NOTE
• The LM data on the Eye Care card will automatically be erased if one of the following
conditions is met:
• If LM data is transferred to an AUTO OPTOMETRY SYSTEM.
• If new LM data is written. (The new data will be written over the existing data on
the card.)
Therefore, if patient A’s LM data is not transferred to the AUTO OPTOMETRY
SYSTEM and the next patient B receives AR measurement only, there are possibilities
that one Eye Care card holds both LM data of patient A and objectively measured data
of patient B. In such cases, to avoid confusion, erase the data on the Eye Care card
before writing the objectively measured data of patient B. See “6.3 Erasing Data on
the Eye Care Card”.
6-4
NOTE
• It is possible to import LM data by connecting the ARK-730A and a NIDEK Lensmeter
with the optional interface cable (see the “*2” footnote on page 3-8).
In this case, when the print button (or “DATA” button) of the lensmeter is pressed
just after measurement using the lensmeter, the measured LM data will be imported
to the ARK-730A.
6.3 Erasing Data on the Eye Care Card

All the data on the Eye Care card is erased.
1. Hold down the clear switch for about 1

second.
The EyeCa-RW will emit a short beep and the
access indicator will illuminate in red.
Clear switch
2. Insert the Eye Care card.

The access indicator will illuminate in orange and all the data on the Eye Care card will be
erased. If the data has been erased, the EyeCa-RW will emit a longer beep and the access
indicator will flash in green.
§7 ENTERING PATIENT ID USING BARCODE SCANNER
It is possible to read a patient ID by scanning a barcode using the optional barcode scanner.
7.1 Connecting the Barcode Scanner

The procedure for connecting the optional barcode scanner is explained.
CAUTION
• Connections must be made on a stable, level place with enough space.
If the device falls, malfunction or injury may result.
• Connections must be made after turning off the ARK-730A.
1. Turn off the power switch and disconnect the power cord from the wall outlet.
2. Lock the main body to the base unit with the locking knob and lay the ARK-730A down
gently.
3. Connect the cable of the barcode scanner to the interface connector for input ( ) located
at the bottom of the ARK-730A (see page 3-7).
4. Stand up the ARK-730A, and loosen the locking knob to release the main body.
5. Connect the power cord to the wall outlet and turn on the power switch.
6. Set the “No. 56: IN Port Sel.” parameter to “Barcode”.

See “8.1 Setting Parameters” (p. 8-1).
NOTE
• The power to the barcode scanner is supplied via the cable connected to the interface
connector of the ARK-730A.
7-2
7.2 Reading a Patient ID

A patient ID is read from a barcode. The read patient ID will be used in the NIDEK ADVANCED
VISION INFORMATION SYSTEM NAVIS. The read patient ID as well as measured data will
be included in a printout produced by the ARK-730A (see page 5-2).
NOTE
• Although a patient ID can be read before and after measurement, it is advisable to read
it before printing measured data.
1. Let the scanner window scan the barcode.

Scanner window
2. Press the trigger button.

The scanner window will flash in red and the
barcode will be read. After the barcode has been
read successfully, the confirmation LED will Trigger button
illuminate and the scanner will emit a short
beep. At the same time, when the barcode has
been read successfully, the ARK-730A will
show “ID” on the TV monitor.
Confirmation LED
NOTE
• When the patient ID is read using the barcode and then the read data is printed, it will
be automatically erased from the memory regardless of the setting of the “Print&CRL”
parameter.
• When the measured data that has been printed is displayed, it will be automatically
erased after the patient ID is read.
§8 VARIOUS SETTINGS
8.1 Setting Parameters

The ARK-730A is equipped with a function to change parameters of various device conditions
according to the operator’s needs. The method of changing and confirming each parameter
setting is described as follows.
1. Press .
The TV monitor shows “PARAMETER SET << 1/6 >>”, and the display panel shows the
setting and the parameter number.
Setting Parameter No.
2. Establish the parameter setting mode which contains the desired parameter, referring to
the parameter tables on pages 8-4 to 8-9.
For each pressing of , the setting mode changes in the order shown below.
Parameter setting mode 1 (Parameter No. 1 to 10) → Mode 2 (Parameter No. 11 to 17) → Mode
3 (Parameter No. 21 to 30) → Mode 4 (Parameter No. 31 to 38) → Mode 5 (Parameter No. 41
to 48) → Mode 6 (Parameter No. 51 to 58) →Date & Time setting mode → Parameter setting
mode 1 → ... .
8-2
3. In the selected mode, press .
The parameter settings in each mode will be printed as follows.
No. Parameter name Setting

8-3
4. Make the desired parameter number appear on the display panel.
For each pressing of the start button, the parameter number increases.
NOTE
• Pressing the start button when the last number of the selected mode is shown makes
the first parameter number of that mode appear again.
5. Change the setting by pressing or .
NOTE
• Refer to the parameter tables on the following page for the setting contents.
An underlined setting option indicates the factory setting. (Factory-settings may
vary with destinations.)
6. To finish setting ⇒ Press .

To activate the date and time setting mode ⇒ Press .
To change another parameter setting ⇒ Go back to step 2.
NOTE
• The parameter settings will be maintained in the memory due to an internal battery*1
even though the power switch is turned off.
*1 The battery is rechargeable. When you are operating the device for the first time after unpacking
or when the device has not been operated for a long time (about one month or longer), the
clock may reset to zero, and the system parameters and comment settings may return to their
factory settings. In such a case, turn on the device and leave it “ON” to recharge the battery.
The battery needs 24 hours for a full charge. If you are using the device 8 hours a day, you will
have to keep the device on for three days before the battery is fully charged. Once the battery
is fully charged, the device operates normally for daily use.
A rechargeable lithium battery is used in the device. When disposing of the battery-mounted
circuit board, follow local governing ordinances and recycling plans regarding disposal or
recycling of lithium batteries.
8-4
Parameter Tables
< Setting Mode 1 >
No. Parameter name Setting option
1 Step 0.01D / 0.12D /0.25D
2 Vertex D. 0 mm / 10.5 mm /12 mm
13.75 mm / 15 mm / 16.5 mm
3 Axis Step 1º / 5º
4 Meas. Mode Con. / Nor.
5 AI Mode YES / NO
6 Tracking SW S&T/M / S&T/T/M / T/M
7 Compare SW Auto / Manu. / NO
8 Compare (AR) SE / –SPH
9 ADD. SW YES / NO
10 ADD. Sel. 1.50D / 1.75D / 2.00D
[No. 1] The indication step of SPH and CYL data for AR measurement.
[No. 2] The distance between the corneal vertex to the posterior surface of spectacle lenses when
the patient wears them.
* “13.75 mm” for the default of devices destined for NIDEK INCORPORATED.
[No. 3] The indication step of AXIS data for AR measurement.
[No. 4] The way of fogging for AR serial measurement.
Con. (High-speed mode): The fogging is maintained throughout the serial
measurement. This mode is useful for children who cannot
fixate their eyes very long.
Nor.: Holding the start button keeps fogging for each measurement. This mode is
useful for patients who accommodate their eyes easily.
[No. 5] Selection of whether or not to use the AI mode.
When this parameter is set to “YES”, measurement will be automataically completed when
the median values are obtained.
[No. 6] Selction of how to switch the auto-tracking and auto-shot functions to ON or OFF when
is pressed.
S&T / M: Every time is pressed, both the auto-tracking and auto-shot functions are
switched bewteen ON and OFF.
S&T/ T/ M: Every time is pressed, these functions are switched as: Both the auto-
tracking and auto-shot functions are turned on.→ Only the auto-tracking
function is turned on.→ Both the auto-tracking and auto-shot functions
are turned off.
T/ M: Every time is pressed, these functions are switched as: Only the auto-tracking
function is turned on.→ Both the auto-tracking and auto-shot functions are turned
off. With this setting, the auto-shot function is disabled.
[No. 7] Selection of how to enter the View Comparison function screen.
Auto: The View Comparison function screen will automatically be shown when one
eye has been measured.
Manu.: The View Comparison function screen will be shown when is pressed.
NO: The View Comparison function screen is not shown.
8-5
[No. 8] Selection of the SPH value (spherical power) to be used for the viewing condition of AR
measurement during the View Comparison function.
SE: The spherical power of the SE value (Spherical Equivalent) is used.
–SPH: The highest power (spherical power + cylindrical power) is used.
[No. 9] Selection of whether or not to add addition power by pressing the start button during the
View Comparison function for near vision.
[No. 10] Selection of the addition power to be added during the View Comparison function for near
vision.
< Setting Mode 2 >

11 KM Unit mm / D
12 KM Display R1, R2 / AVE, CYL
13 Ref. Index 1.3320 / 1.3360 / 1.3375
14 KM Continue 1 to 10 (3)
15 Sagittal YES / NO
16 Sagit Axis Axis / FIX
17 Sagit Print All / Short
18
19
20
[No. 11] Selection of whether or not to indicate the corneal curvature with radius (mm) or refractive
power (D).
* “D” for the default of devices destined for NIDEK INCORPORATED.
[No. 12] Selects the KM measurement indication between R1 (flattest meridian) & R2 (steepest
meridian), and AVE (average of R1 and R2) & CYL (corneal cylinder axis).
[No. 13] Selection of the corneal refractive index.
[No. 14] Setting of the number of serial measurements for KM measurement in the R/K or K mode.
[No. 15] Selection of whether or not to measure sagittal radius after KM measurement in the R/K or
R mode.
[No. 16] Selection of whether or not to convert the sagittal radius measurement for the axis of the
steepest meridian which has been obtained by KM measurement. To convert data, choose
AXIS.
[No. 17] Selection of the print format of the sagittal radius measurement.
All: All data is printed out (see page 4-26).
Short: Only the sagittal radius values and the total eccentricity are printed out (see page
4-25).
8-6
< Setting Mode 3 >

21 Print Manu. / Auto / NO
22 Econo. Print YES / NO
23 Print & CLR YES / NO
24 Patient No. YES / NO
25 Patient No. 0001 to 9999
26 Name Print YES / NO
27 Date Format Y.M.D / M.D.Y / D.M.Y / NO
28 Eye Print YES / NO
29 AR Print All / Short
30 KM Print All / Short / All (KM)
[No. 21] Selection of how to start printing, or not to print.

Manu.: Data is printed out by pressing .
Auto: Data is printed out automatically after both eyes have been measured.
NO: Data is printed out.
[No. 22] Selection of whether or not to use the economical print function.
When this parameter is set to “YES”, the data will be printed with narrow line-spacing so
that the printer paper can be saved.
[No. 23] Selection of whether or not to erase measured data in the memory right after printing.
When this parameter is set to “NO”, the measured data will be erased when the next
measurement is performed after printing.
[No. 24] Selection of whether or not to print the patient number.
[No. 25] Setting of the patient number to be printed out.
⇒ The patient number increases.
⇒ The patient number decreases. ( works as a reset button. If the button is
pressed at first, the value will reset to “0001”.)
[No. 26] Selection of whether or not to provide spaces for writing the patient’s name and sex on
the printout.
[No. 27] The format of the date on the printout. (e.g.: In the case of 4 o’clock PM on December
20, 2002)
Y.M.D = Year, Month, Day (e.g.: 2002. 12. 20 4:00 PM)
M.D.Y = Month, Day, Year (e.g.: DEC/20/2002 4:00 PM)
D.M.Y = Day, Month, Year (e.g.: 20/DEC/2002 4:00 PM)
NO = Date and time are not printed.
[No. 28] Selection of whether or not to print the eyeprint.
[No. 29] The print format of AR measurement.
All: All data and median values are printed out.
Short: Only the median values are printed out.
[No. 30] The print format of KM measurement.
All: All data and median values are printed out.
Short: Only the median values are printed out.
All (KM):When the K mode is selected for the measurement mode, all data and median
values are printed out. When another mode is selected, only the median
values are printed out.
8-7
< Setting Mode 4 >

31 SE Print YES / NO
32 TL Print YES / NO
33 CL Print YES / NO
34 Conf. Index YES / NO
35 IOL(*)Mark YES / NO
36 Near PD YES / NO
37 Error Print YES / NO
38 ID Print YES / NO
39
40
[No. 31] Selection of whether or not to print SE values for the median values (or the latest values
when the median values have not been obtained).
[No. 32] Selection of whether or not to print trial lens data which is based on the median values.
[No. 33] Selection of whether or not to print CL conversion values which are based on the median
values, and SE values of the CL conversion values.
[No. 34] Selection of whether or not to print the confidence index.
[No. 35] Selection of whether or not to print “*” just before the confidence index indicating that
the data was measured in the IOL mode.
[No. 36] Selection of whether or not to print Near PD data.
[No. 37] Selection of whether or not to print error occurred during AR measurement.
[No. 38] Selection of whether or not to print the patient ID. The patient ID is scanned by the
optional barcode scanner.
8-8
< Setting Mode 5 >

41 Window check YES / NO / DAY
42 Auto IOL YES / NO
43 Auto PD YES / NO
44 Working D. 35 to 70 cm / 14 to 28 inch
45 TV Auto-OFF 5 min / 10 min / 15 min / NO
46 Beep High / Low / NO
47 Error Code YES / NO
48 Error Data YES / NO
49
50
[No. 41] Selection of whether or not to automatically check the measuring window for soiling (p.
10-6).
NO: The measuring window is not checked.
YES: The measuring window is checked at every startup.
DAY: The measuring window is checked at the first startup of the day.
[No. 42] Selection of whether or not to use the auto IOL function.
When set to “YES”, the IOL mode ( ) automatically turns on after three erroneous
measurements in a row.
[No. 43] Selection of whether or not to measure PD during AR measurement. (Applies only when
both eyes are measured.)
[No. 44] Setting of the near working distance, which is referred at near PD calculation, between
35 to 70 cm (5 cm increments). After this, there is an option for the indication in inches
between 14 to 28 inches (2 inch increments). The setting is also in effect as the near
working distance during the View Comparison function.
* “14” inches for the default of devices destined for NIDEK INCORPORATED.
[No. 45] Selection of whether or not to use the auto-off function and the time of no operation after
which the TV monitor is shut off.
Auto-off mode: The TV monitor turns off automatically when there is no operation for
more than the set time period and the display panel shows the time.
The monitor ON condition is recovered by pressing any button.
[No. 46] Selection of the tone of the beeps which is emitted during measurement.
[No. 47] Selection of whether or not to display and print error codes occurred during AR
measurement.
[No. 48] Selection of whether or not to display and print erroneous data obtained during AR
measurement.
(When this parameter is set to “YES”, an error will appear once and then the flashing
error data will appear on the display.)
8-9
< Setting Mode 6 >

51 I/F Mode NIDEK / NCP10
52 I/F Format All / Short
53 Baud-Rate 9600 / 4800 / 2400 / 1200
54 Bit Length 7/8
55 CR Code YES / NO
56 IN Port Sel. LM / Barcode
57 LM Data Prt. YES / NO
58 EyeCareC (LM) YES / NO
59
60
[No. 51] Setting of the device to be communicated with.

NIDEK: Communication with a NIDEK-brand device
(Set this parameter to “NIDEK”.)
[No. 52] The format of data to be sent. Selectable between “All”, which sends out all the measured
data, and “Short”, which sends out only the restricted data.
[No. 53] Selection of baud-rate (bit transmission speed) for communication.
[No. 54] The bit number for a single character used for communication.
[No. 55] Selection of whether or not to attach a CR (carriage return) code at the end of data to be
sent.
[No. 56] Selection of the device to be connected to the interface connector.
LM: Lensmeter
Barcode: Barcoder scanner
[No. 57] Selection of whether or not to print the data measured by the lensmeter connected to the
interface connector with the printer built into the AR.
When this parameter is set to “YES”, the printout of the data will come out from the
printer built into the ARK-730A by pressing the print button of the lensmeter. Use a
lensmeter provided with the function for printing data. For details, refer to the Lensmeter
Operator’s Manual.
[No. 58] Selection of whether or not to read LM (lensmeter) data from the optional Eye Care card
system connected to the interface connector. The read LM data will be used for the
View Comparison function. In addition, when using the old-type IC card Reader/Writer,
set this parameter to “NO”.
8 - 10
8.2 Setting Date and Time

1. Press .
2. Press six times so that the date and time setting mode is established.
The TV monitor shows “CLOCK SET” while the display panel shows the date with “year”
flashing. The flashing number indicates that the number is changeable.
Year Month Day Hour Minute AM/PM
3. Press the start button to select the position that you want to change.
The selection order is as follows:
Year → Month → Day → Hour → Minute → Year →……
4. Press or to change the setting.

........................ The number increases.
........................ The number decreases.
5. Repeat steps 3 and 4 to set date and time.
6. After setting the desired parameters, press to exit the date and time setting mode.
Pressing instead of returns the mode to parameter setting mode 1.
NOTE
• The internal clock will continue to work due to an internal battery even though the
device is turned off. If the date and time setting becomes incorrect, recharge the battery
(see “*1” on page 8-3).
8 - 11
8.3 Entering Comments

1. Turn off the power switch.
2. While holding down, turn on the power switch.

The following will be printed out.
< Sample Printout >
Parameters
Parameters
for servicing
Parameters
for servicing
Date and time
Comment
Model name
8 - 12
3. Press seven times to establish the mode for entering comments.
The TV monitor shows “COMMENT SET” while the display panel shows the following.
Character code Line No. Column No.
NOTE
• It is possible to input up to 24 × 2 characters.
Column No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1
Line No.
2
4. Make the desired column number and the desired line number appear on the display
panel.
When the start button is pressed, the column number increases. When the start button is pressed
after column number 24 is displayed, the line number changes.
5. Press or to change the character code to the desired one.

........................................... The character code increases.
........................................... The character code decreases.
For the character code, refer to the table on the following page.
8 - 13
Character Code Table
The following characters (symbols) are available to input.
Ten place of character code
2 3 4 5 6 7 8 9 A b
0 SPC 0 @ P P J ― タミ
1 ! 1 A Q a Q 。アチム
2 “ 2 B R b R 「イツメ
One place of character code
3 # 3 C S c S 」ウテモ
4 $ 4 D T d T 、エトヤ
5 % 5 E U e U ・オナユ
6 & 6 F V f V ヲカ二ヨ
7 ‘ 7 G W g W ァキヌラ
8 ( 8 H X h X ィクネリ
9 ) 9 I Y i Y ゥケノル
A ∗ : J Z j Z ェコハレ
B + ; K [ k [ ォサヒロ
C , < L ¥ l { ャシフワ
D - = M ] m } ユスへン
E . > N Ç n Æ ョセホ゛
F / ? O È o のッソマ °
< Example >

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1 N I D E K A R K - 7 3 0 A
2
• If you want to input the letter “N” in column number 10 of line number 1, display “4E 1-7” on
the display panel.
6. Repeat steps 4 and 5 to enter a desired comment.
7. After entering the comment, press to exit the setting mode.

Pressing instead of returns the mode to parameter setting mode 1.
NOTE
• The set comment will be kept in the memory due to an internal battery even though the
power switch is turned off. If the setting returns to the default, recharge the battery
(see “*1” on page 8-3).
8 - 14
8.4 Measuring Hard Contact Lenses

1. Fix the mount for the optional CL holder
onto the upper end of the headrest post and
fix it with the fixing screw.
2. Fill the concave top of the CL holder with

water.
3. Put a contact lens in the water with the

surface to be measured facing upward.
When measuring the concave surface, place the
lens with the concave surface up. When
measuring the convex surface, place the lens
the other way.
NOTE
• Be careful not to let bubbles get under the
lens or water or dust on the lens.
4. Insert the pin of the CL holder into the cavity

on the top of the mount and turn the holder
with the surface to be measured facing
toward the measuring window.
5. Select KM measurement mode and measure

the lens in the same manner as usual KM
measurement.
NOTE
• When the convex surface of a contact lens is measured, the axis angle can be read
directly. When the concave surface is measured, however, the measured axis will be
read inversely.
• Soft contact lenses cannot be measured.

§9 TROUBLESHOOTING GUIDE
In the event that the device does not work correctly, correct the problem according to the following
table before contacting NIDEK or your authorized distributor.
Symptom Suggestion
• The power cord may not be correctly connected.
Reconnect it securely.
The TV monitor and disdplay panel do not • The power switch may not have been turned on. Check
turn on. the power switch.
• The fuses may be blown. If so, replace with new ones

(p. 10-4).
• The auto-off function may have been executed. Try to
recover the monitor ON condition by pressing any
The TV monitor does not turn on button.
(not clear) even though
the power is on. • The brightness may be darkly adjusted. Open the AUX.
button cover and adjust the brightness by turning the
brightness control.
• The auto-off function may have been executed. Try to
The screen disappears suddenly. recover the monitor ON condition by pressing any
button.
The screen rolls. • The screen may not be horizontally or vertically locked.
* This symptom does not occur in the LCD Adjust it with the H or V control (p. 3-7).
type monitor.
• The locking knob may be fixing the main body.
Release the main body by turning the locking knob
which is beside the joystick.
The main body cannot be moved laterally.
• The locking knob may be impeding the main body.
Release the main body by turning the locking knob
which is beside the joystick.
• Check the printer paper. If the paper has been used up,
set new printer paper (p. 10-1).
Printing cannot not be executed.
• The "Print" parameter may be set to "NO". Reset the
parameter setting.
9-2
Symptom Suggestion
• The printer roll may be set with the wrong side up.
The printer does operate, however,
Set it with the correct side up.
printed results cannot be obtained.
• The auto-tracking function or auto-shot function

may not have been turned on.
Press to turn it on.
• Room illumination may be reflecting on the cornea.

Change the location and try measurement again.
• The auto-tracking function or auto-shot function

may not work on some eyes such as keratoconus
or recently-operated cornea. In such cases, turn
off the auto-tracking function and start
The auto-tracking function or auto-shot measurement.
function does not work.
• The patient who has substantial ocular ataxia or
who cannot fixate his or her eyes, the auto-
tracking function may not work. In such cases,
turn off the auto-tracking function and start
measurement.
• If the device is installed in the vicinity of a window

where the device is exposed to sunshine, light
interference may adversely affect these functions.
Change the installed position of the device and
start measurement again.
Date and time settings go out of order • The internal battery may be dead. Turn the power
or system parameters and comment on and leave it on for 24 hours to recharge the
setting return to their factory settings.battery.
When the power is turned on, the • The internal battery may be dead. Turn the power
following error appears: on and leave it on for 24 hours to recharge the
Err a, d battery.
The error message "Memory failure on
RAM, Clock Error" is printed out.
"<PD ERR>" appears on the TV • Make sure that the PD measuring window is not
monitor. blocked (p. 4-2).
9-3
Symptom Suggestion
• The patient may have blinked during
measurement. Instruct the patient not to blink and
try measurement again.
• The eyelid or eyelashes may obstruct

measurement. Instruct the patient to open his or
her eye wider. If the patient cannot open wider, lift
the patient's lid, paying attention not to press
against the eyeball.
A measurement error appears. • The pupil may be too small for measurement.
Have the patient sit in a dark room for a while until
the pupil enlarges enough and try measurement
again.
• An IOL-implanted eye or eye with a contact lens

may be measured. Turn on and try
measurement again. ("IOL" will appear on the
upper left of the monitor.)
• The data may exceed the measurable limit.

• Clean the measuring window. See "10.4 Cleaning
the Measuring Window".
The message "Check measuring
window" is printed out on startup. • If the measuring window is not dirty, make sure
that the measuring window is not blocked on
The following error appears on the t t the printer paper. The paper may be used
• Check
display panel at power-up: up or the printer lever may be incorrectly set.
Err 7 Push the lever down (p. 10-1).
The following error appears on the • Check the connection of the interface cable.
display panel:
Err IF
The following error appears on the • Contact NIDEK or your authorized distributor.
display panel at power-up:
Err 1 - 4, 9, b, c
• Contact NIDEK or your authorized distributor.
The error message "Memory failure on
E2PROM, PC22 Error" is printed out.
* If the problem cannot be solved by following the suggestions above, contact NIDEK or your
authorized distributor.
§10 MAINTENANCE
10.1 Replacing the Printer Paper

When a red line appears on the side of the printer paper, it means that the paper is running short.
In such a case, stop using the printer and replace the paper with a new one.
NOTE
• Do not run the printer without printer paper.
It ruins the printer head.
• Do not pull the printer paper in the printer forcefully. This may cause malfunction of
the printer.
• Replace the printer paper with the power switch off.
1. Pull the printer cover to open.
2. Raise the lever on the right and turn the gear

backward in order to feed the paper out.
Lever
Gear
3. Take out the used paper and remove the shaft

from the roll.
10 - 2
4. Insert the shaft into the new roll of printer
paper.
5. Cut the end neatly with scissors and pass the paper through the printer housing as shown
in the figure on the right.
NOTE
• If the roll is set in such a way that the
paper becomes upside down, it is not
possible to print data on the paper.
• When the paper comes to point “ ”, turn

the gear forward to feed the paper. Gear
6. Set the printer paper into the printer.
NOTE
• To remove the slack from the paper, turn
the gear forward.
7. Push down the lever on the right. Lever
8. Pass the paper through the printer cover.
9. Push the printer cover toward the main body.

10 - 3
10.2 Setting a Stack of Chinrest Paper

1. Remove the two fixing pins from the chinrest.
2. Take out a proper number of chinrest papers from a pack of the paper.
It is impossible to set a whole stack of chinrest paper. Be sure to set a stack with a thickness of
6 mm or less. Pay attention not to scatter the chinrest paper.
3. Insert the fixing pins into the holes in the

Fixing pin
chinrest paper.
Insert the removed pins into both holes of the
stack of paper. Stack of chinrest paper
4. Set the stack of chinrest paper onto the

chinrest.
1) Insert the pins into the holes in the chinrest
while holding both fixing pins and stack of
paper.
2) Push the pins into the holes of the chinrest

with the other hand.
10 - 4
10.3 Replacing Fuses

If the device does not work even though the power switch is on, the fuses may be burnt out. In
such a case, replace them.
CAUTION
• Replace fuses in a stable and open space. If the device falls, it may cause device
malfunction or personnel injury.
• Never use fuses other than specified.

This may cause fire.
AC 100 V, 120 V: T2A 250 V
AC 200 - 220 V, 230 - 240 V: T1A 250 V
1. Turn off the power and remove the power

cord.
2. Lock the main body to the base unit with

the locking knob and lay it down gently.
3. Turn the fuse holders counterclockwise as

indicated by the arrow with a screwdriver
and remove them.
4. Pull out the fuse holders from the base unit.

10 - 5
5. Remove the used fuses from the fuse holders
and insert new fuses into the fuse holders.
6. Turn the fuse holders clockwise while

pressing them down with the screwdriver
and set it into the main body.
CAUTION
• If fuses blow frequently, do not touch the inside of the device but contact NIDEK or
your authorized distributor.
If you touch the inside of the device, electric shock may result.
10 - 6
10.4 Cleaning the Measuring Window

When the measuring window gets fingerprints or dust on it, the reliability of the measured values
will be lowered substantially. Check the measuring window before use, and then clean it if it is
soiled.
1. Blow off the dust on the measuring window with a blower.
2. Wrap the lens cleaning paper around a thin

stick-like object such as a cotton swab and
wipe the glass of the measuring window with
the material moistened with alcohol.
Use an object that will not damage the glass.

(Never use hard objects such as metal products.)
Wipe the measuring window lightly from the

center to the outside along an arc. Wrap a piece of cleaning paper around the tip.
Pay attention not to put alcohol onto the sensor Measuring window
window and cover. Apply only to the measuring
window.
3. Check if the window is clean using a penlight.

If not, clean it again with a new piece of
cleaning paper.
Apply light with a penlight and change the

viewing angle to check the dirt cleanliness
accurately.
NOTE
• When the “Window check” parameter is set to “YES” or “DAY”, the measuring window
will be checked if it is clean at startup.
“YES” ⇒ Check every startup
“DAY” ⇒ Check at the first startup of the day
When the message “Check measuring window.” is printed out, clean the measuring
window.
At startup, do not stand or put objects in front of the measuring window.
If something blocks the front of the measuring window within the range of 1 m, the
measuring window may not be checked correctly.
10 - 7
10.5 Cleaning the Exterior

When covers or panels become dirty, wipe with a dry and soft cloth. For stubborn dirt, immerse
the cloth in a neutral detergent, wring well, and wipe. Finally wipe with a dry and soft cloth.
NOTE
• Never use an organic solvent such as paint thinner.
It could ruin the surface of the device.
10.6 List of Replacement Parts

Article Order Number
Printer paper 80620-00001
Pack of chinrest paper 32903-M047
Fuse (AC 100 - 120 V) 80402-02116
Fuse (AC 200 - 220 V / 230 - 240 V) 80402-02113
§11 SPECIFICATIONS
11.1 Specifications
{ Measurement of refractive error (AR measurement)
• Spherical power (S) Measurable range –20.00 D - +23.00 D (VD = 12 mm)
Indication steps 0.01 D/ 0.12 D/ 0.25 D
• Cylindrical power (C) Measurable range 0 D - ±12.00 D

• Cylinder axis (A) Measurable range 0º - 180º

Indication steps 1º/ 5º
• Minimum pupil diameter measurable φ 2.5 mm
• Vertex distance 0 mm/10.5 mm/12 mm/13.75 mm/15 mm/16.5 mm
• Target fixation Auto-fogging system
• Accuracy
The accuracy specifications are based on the results of eye model testing performed in accordance
with ISO10342, Ophthalmic Instruments-Eye Refractometers.
Maximum scale
Criterion Measuring range Test devicea Tolerance
interval
-15 D to + 15 D
0 D, ±5 D, ±10 D ±0.25 D
(Maximum
Spherical vertex power 0.25 D
meridional vertex
power) ±15 D ±0.50 D
Cylindical vertex power 0 D to 6 D 0.25 D Sph: approx. 0 D ±0.25 D

b
Cylinder axis for Cyl: -3 D
0° to 180° 1° ±5°
cylinder power Axis: 0°, 90°
a
The refractive error of the test device shall not differ by more than 1.0 D from the nominal
value above.
b
Cylinder axis shall be indicated as specified in ISO 8429.
11 - 2
{ Measurement of corneal curvature (KM measurement)

• Corneal curvature (R1, R2, AVE)
Measurable range 5.00 mm - 13.00 mm
Indication steps 0.01 mm
Accuracy ±0.05 mm
• Corneal refractive power (R1, R2, AVE)

Measurable range 25.96 D - 67.50 D (n=1.3375)
Corneal refractive idexn = 1.3375/ 1.336/ 1.332
• Corneal astigmatism (CYL)

Measurable range 0 D - ±12.00 D
• Corneal axis of astigmatism

Measurable range 0º - 180º
Indication steps 1º/ 5º
• KM measurement range φ 3.3 mm on the cornea (For corneal curvature of 7.7 mm)
• Size of mire ring φ 2 mm on the cornea (For corneal curvature of 7.7 mm)
{ Measuring time
• AR measurement Less than 0.3 seconds/eye
• KM measurement Less than 0.1 seconds/eye
{ PD measurement
• Measurable range 30 mm - 85 mm
(Near PD: 28 mm - 79 mm, Near working distance= 35 cm)
• Indication steps 1 mm
{ CS measurement
• Measurable range 10.0 mm - 14.0 mm
• Indication steps 0.5 mm
{ PS measurement
• Measurable range 1.0 mm - 10.0 mm
• Indication steps 0.5 mm
11 - 3
{ Printout
• Date and time of measurement, patient number, patient ID
• Vertex distance
• Near working distance
• AR measurement 10 stored data for each eye, right and left
Median value (when there are 3 or more measurements)
Latest value (when there are 2 or less measurements)
• KM measurement 10 stored data for each eye, right and left
Median value (when there are 3 or more measurements)
Latest value (when there are 2 or less measurements)
• PD measurement Measured value of Distance PD
Calculated value of Near PD
(for near working distance between 35 cm - 70 cm, changeable
in increments of 5 cm)
• CS measurement
• PS measurement
• CL conversion value
• SE (Spherical Equivalent) value
• Err (Measurable range over error)
• Trial lens data
• Eyeprint
{ Chart
• Scenery chart 1
{ Alignment observation
• 5-inch TV monitor
{ Measurement indication
• LED digital display Refractive error measurement, PD measurement,
CS measurement, PS measurement,
Corrective power of the View Compare function
(SE value or –SPH value)
• TV monitor display Corneal curvature measurement, Measurement count,
PD measurement, PS measurement, CS measurement
View Comparison data
11 - 4
{ Interface
• Interface which complies with the RS-232C standard
• Two types of connection of IN/OUT
IN: Connect a lensmeter to import data and then transfer the data to a refractor.
Input a patient ID using the barcode scanner and transfer it with measured data to a
system such as NAVIS.
OUT:Connect a refractor and output all data which can be printed out except for eyeprint.
Connect the Eye Care card system and output all data which can be printed out except
for eyeprint. Or input LM data.
{ Axis-alignment range
• Back and forth: 33 mm, right and left: 85 mm, up and down: 28 mm
Auto-tracking in XY direction, Auto-focusing in Z direction
{ Working range of auto-tracking

• φ 4 mm on the cornea
{ Power source
• A.100/120 Vac ±10% 120 VA 50/60 Hz
B. 200 - 220/ 230 - 240 Vac ±10% 120 VA 50/60 Hz
{ Dimensions and weight

• 260 (W) × 485 (D) × 456 (H) mm 20.5 kg
{ Environmental conditions (during transport and storage)

• Temperature –20ºC - 60ºC
• Humidity 10 - 95% (Non-condensing)
{ Environmental conditions (during use)

• Temperature 10ºC - 35ºC
• Humidity 30 - 75% (Non-condensing)
• Atmospheric pressure 800 - 1060 hpa
11 - 5
11.2 Accessories
11.2.1 Standard accessories

Fuses (Two of them are located in the body.) 4
Printer paper rolls (One of them is set in the body.) 4
Power cord 1
Dust cover 1
Pack of chinrest paper 1
Fixing pins 2
Operator’s manual 1
11.2.2 Optional accessories

Eye Care card system
Motorized stand
Interface cable
Barcode scanner
CL holder set
§12 EMC (ELECTROMAGNETIC COMPATIBILITY)
The Electromagnetic Compatibility Directive sets the essential requirements for electrical and electronic
equipment that may disturb or even be disturbed by other equipment. The ARK-730A complies with
these requirements as tabled below. Follow the guidance on the tables for use of the device in the
electromagnetic environment.
EMC (IEC 60601-1-2: 2001)

Guidance and manufacturer's declaration - electromagnetic emissions
The ARK-730A is intended for use in the electromagnetic environment specified below. The customer or the user
of the ARK-730A should assure that it is used in such an environment.
Emissions test Compliance Electromagnetic environment - guidance
RF emissions Group 1 The ARK-730A uses RF energy only for its internal
CISPR 11 function. Therefore, its RF emissions are very low and
are not likely to cause any interference in nearby
electronic equipment.
RF emissions Class B The ARK-730A is suitable for use in all establishments,
CISPR 11 including domestic establishments and those directly
Harmonic emissions Class A connected to the public low-voltage power supply
IEC 61000-3-2 network that supplies buildings used for domestic
Voltage fluctuations/Flicker Complies purpose.
emissions IEC 61000-3-3
Guidance and manufacturer's declaration – electromagnetic immunity
Immunity test IEC 60601 test level Compliance level Electromagnetic environment - guidance
Electrostatic ±6kV contact ±6kV contact Floor should be wood, concrete or ceramic tile. If
Discharge ±8kV air ±8kV air floors are covered with synthetic material, the
(ESD) relative humidity should be at least 30%.
IEC 61000-4-2
Electrical fast ±2kV for power supply ±2kV for power Mains power quality should be that of a typical
transient/burst lines supply lines commercial or hospital environment.
IEC 61000-4-4 ±1kV for input/output ±1kV for input/output
lines lines
Surge ±1kV for power supply ±1kV for power Mains power quality should be that of a typical
IEC 61000-4-5 lines supply lines commercial or hospital environment.
±2kV for input/output ±2kV for input/output
lines lines
Voltage, dips, ＜5% U T ＜5% U T Mains power quality should be that of a typical
short commercial or hospital environment. If the user of
(＞95% dip in U T ) (＞95% dip in U T )
interruptions and the ARK-730A requires continued operation
voltage for 0,5 cycle for 0,5 cycle during power mains interruptions, it is
variations on 40% U T 40% U T recommended that the ARK-730A be powered
power supply (60% dip in U T ) (60% dip in U T ) from an uninterruptible power supply or a battery.
input lines IEC for 5 cycles for 5 cycles
61000-4-11
70% U T 70% U T
(30% dip in U T ) (30% dip in U T )
for 25 cycles for 25 cycles
＜5% U T ＜5% U T
(＞95% dip in U T ) (＞95% dip in U T )
for 5 sec for 5 sec
Power 3 A/m 3 A/m Power frequency magnetic fields should be at
frequency levels characteristic of a typical location in a
(50/60Hz) typical commercial or hospital environment.
magnetic field
IEC 61000-4-8
NOTE U T is the a.c. mains voltage prior to application of the test level.
12 - 2
Guidance and manufacturer's declaration - electromagnetic immunity
Immunity test IEC 60601 test level Compliance level Electromagnetic environment - guidance
Portable and mobile RF communications
equipment should be used no closer to any part
of the ARK-730A, including cables, than the
recommended separation distance calculated
from the equation applicable to the frequency of
the transmitter.
Recommended separation distance
d =1.2x√P
d =1.2x√P 80MHz to 800MHz
d =2.3x√P 800MHz to 2.5GHz
where P is the maximum output power rating of
Conducted RF 3Vrms 3Vrms the transmitter in watts (W) according to the
IEC 61000-4-6 150kHz to 80MHz (V1=3) transmitter manufacturer and d is the
Radiated RF 3V/m 3V/m recommended separation distance in metres
IEC 61000-4-3 80MHz to 2.5GHz (E1=3) (m).Field strengths from fixed RF transmitters,
as determined by an electromagnetic site
a
survey, should be less than the compliance
b
level in each frequency range. Interference may
occur in the vicinity of equipment marked with
the following symbol:
NOTE 1 At 80MHz and 800MHz, the higher frequency range applies.

NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects and people.
a. Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land
mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with
accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site
survey should be considered. If the measured field strength in the location in which the ARK-730A is used exceeds
the applicable RF compliance level above, the ARK-730A should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the
ARK-730A.
b. Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
12 - 3
Recommended separation distances between portable and mobile RF communications equipment and
the ARK-730A
The ARK-730A is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the ARK-730A can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and
the ARK-730A as recommended below, according to the maximum output power of the communications
equipment.
Rated maximum output power of transmitter Separation distance according to frequency of transmitter
W m
150kHz to 80MHz 80MHz to 800MHz 800MHz to 2.5Hz
d =1.2√P d =1.2√P d =2.3√P
0.01 0.12 0.12 0.23

0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in
metres (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the
maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.
NOTE 1 At 80MHz and 800MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects and people.
APPENDIX A GLOSSARY
• AI mode
The mode in which the device completes AR or KM measurement as soon as the median values are obtained.
• AR median value, KM median value

The central value of the measured values which are put in order in the computer when AR or KM measurement
is performed.
• Auto IOL
The function where the device automatically turns on the IOL mode after three times of erroneous measurement.
• Auto-off mode
A mode in which the TV monitor goes off automatically to save power when there is no operation for the
specified time.
Pressing any button recovers the TV ON condition.
• Auto-shot
The function where the device automatically starts serial measurement as soon as the device is properly aligned
and in focus.
• Auto-tracking, auto-focusing
The function where the device automatically controls the up, down, right, and left movements for alignment
and forward and backward movements for focusing. This function works in a range of 4 mm in diameter on the
cornea.
• Contact Lens (CL) conversion value

The AR median values (or the latest values when the median values have not been obtained) are converted into
CL values, letting the vertex distance (VD) be 0 mm.
• Comment
It is possible to enter some letters or marks as you wish on the printout. The device accepts up to 24 letters ×
2 lines as a comment.
• CS
Abbreviation of Corneal Size.
• Eyeprint
Tells graphically the patient’s refractive status based on the median values (or the latest values when the median
values have not been obtained).
• Fogging
Blurs the patient’s view so as not to achieve focus to eliminate accommodation.
• High-speed mode
This mode enables the patient’s view to keep fogging during AR serial measurement.
A-2
• LIMIT mark
Two arrows which appear in the center of the TV monitor when the position of the mire ring gets out of the
working range of the auto-tracking. “<LIMIT>” appears simultaneously.
• Measurable range over error

Err + o .................... The spherical power is over the measurable limit of the + side.
Err – o .................... The spherical power is over the measurable limit of the – side.
Err co ...................... The cylindrical power is over the measurable limit.
• Min. pupil marker

Indicates the minimum pupil size measurable.
• Near PD
Prospective PD at near, which is calculated by the preset near working distance of 35 cm (factory-setting).
• Near working distance

Distance between the eye and the watched target when one sees the target through reading or multifocal glasses.
• PD
Abbreviation of Pupillary Distance.
• PS
Abbreviation of Pupil Size.
• SE (Spherical Equivalent) value

The value that 1/2 of the cylinder value is added to the sphere value. Calculated for median values (or the latest
values when the median values have not been obtained) and CL conversion value.
• Trial lens data

Based on the AR median values (or the latest values when the median values have not been obtained), the
cylinder reading direction is automatically converted so that a spherical trial lens will have lower power as
reference data.
• Vertex distance
The distance between the corneal vertex to the posterior surface of a spectacle lens.
INDEX
A E
Addition power ......................................... 4-13 Entering comments .....................................8-11
AI mode ...................................................... 4-9 Environmental conditions ...........................11-4
Auto IOL ..................................................... 4-4 Erroneous data ................................... 4-8, 4-15
Auto-off mode ............................................ 4-1 Eye level marker ......................................... 3-7
Auto-PD measurement ............................. 4-21 Eyeprint ................................................ 5-3, 5-4
Auto-shot OFF .......................................... 4-14 Eyeprint button ............................................ 3-5
Auto-shot ON ............................................. 4-6
Auto-shot ON mark ..................................... 3-3 F
Auto-tracking OFF .................................... 4-14 Flattest meridian ......................................... 4-3
Auto-tracking ON ............................... 4-6, 4-16 Focusing indicator ...................................... 3-3
Auto-tracking ON mark ............................... 3-3 Forehead rest ............................................... 3-7
Auxiliary button cover.......................... 3-1, 4-3 Fuses ........................................................... 2-4
Auxiliary buttons ......................................... 3-5
Axis-alignment range ..................................11-4 H
High-speed mode ........................................ 4-9
B
Brightness control ....................................... 3-5 I
Interface .....................................................11-4
C Interface connector ...................................... 3-7
Change button ............................................. 3-1 IOL button............................................. 3-1, 4-3
Character code table ................................. 8-13 IOL ON mark ............................................... 4-3
Chart...........................................................11-3
Chart distance change button ....................... 3-1 J
Chinrest ....................................................... 3-7 Joystick ....................................................... 3-1
Chinrest knob .............................................. 3-7
CL conversion value .................................... 5-3 K
Comment ..................................................... 5-4 K mode .............................................. 4-4, 4-11
Confidence index ......................................... 5-3
Contrast control ........................................... 3-5 L
CYL +.......................................................... 4-3 LED for corneal illumination ...................... 3-7
CYL – .......................................................... 4-3 LIMIT mark ................................................. 4-7
CYL ± .......................................................... 4-3 Locking knob ........................................ 2-1, 3-1
CYL mode change button ............................. 3-5
Cylinder mode indication ............................ 3-3
D
Dimensions and weight ..............................11-4
Display panel .............................................. 3-1
Index - 2
M T
Manual PD measurement.......................... 4-21 Target .......................................................... 3-3
Measurable range over error ....................... 5-4 3D auto button ............................................. 3-1
Measurement indication .............................11-3 Trial lens data ............................................. 5-4
Measurement of corneal curvature .............11-2 Troubleshooting Guide ................................ 9-1
Measurement of refractive error .................11-1 TV monitor .................................................. 3-1
Measurement count ...................................... 3-3 TV monitor H control .................................. 3-7
Measuring time ...........................................11-2 TV monitor V control .................................. 3-7
Measuring window............................... 2-3, 8-6
Median value ........................................ 5-3, 5-4 V
Memory indicator ................................. 3-1, 5-1 Vertex distance ............................................ 5-3
Min. pupil marker ........................3-3, 4-8, 4-15 View Comparison button ............................. 3-1
Mire ring ..................................................... 3-3 View Comparison function .......................... 4-8
N W
Near PD ...................................................... 5-4 Working range of auto-tracking ...................11-4
Near working distance ....................... 4-12, 5-3
P
Parameter tables .......................................... 6-4
PD ERR ...................................................... 4-2
PD measurement .........................................11-2
PD window .......................................... 3-7, 4-2
Power inlet .................................................. 3-7
Power source .............................................11-4
Power switch .............................................. 3-1
Print button ........................................... 3-1, 5-1
Printer ......................................................... 3-1
Printout ............................................... 5-1, 11-3
PS measurement .........................................11-2
R
R mode ............................................... 4-4, 4-10
Replacing fuses ......................................... 10-4
Replacing the printer paper ....................... 10-1
R/K mode ............................................. 4-4, 4-8
S
SE value ...................................................... 5-3
Setting a stack of chinrest paper ................ 10-3
Setting date and time ................................. 8-10
Setting button ............................................... 3-5
Setting parameters ....................................... 8-1
Start button .................................................. 3-1
Steepest meridian ........................................ 4-3

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NIDEK CO., LTD.

: 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan

MEDICAL ELECTRICAL EQUIPMENT

(This applies to products whose power source is 100/120 Vac.)

§2 SAFETY ......................................................................................................................... 2-1

§3 CONFIGURATION ...................................................................................................... 3-1

§4 OPERATING PROCEDURES .................................................................................... 4-1

§5 PRINTOUT ................................................................................................................... 5-1

§6 DATA TRANSFER USING EYE CARE CARD SYSTEM ......................................... 6-1

§7 ENTERING PATIENT ID USING BARCODE SCANNER ....................................... 7-1

§9 TROUBLESHOOTING GUIDE ................................................................................. 9-1

§11 SPECIFICATIONS ..................................................................................................... 11-1

§12 EMC (ELECTROMAGNETIC COMPATIBILITY) ............................................... 12-1

INDEX ............................................................................................................. End of this manual

1.1 Outline of the Device

1.2 Indications for Use

[Form of protection against electric shock] Class I

[Degree of protection against electric shock] Type B Applied Part

[Degree of protection against flammability]

[Method(s) of sterilization or disinfection recommended by the manufacturer]

*1 In accordance with IEC 60529

1.4 Symbol Information

This symbol indicates the fuse rating.

This symbol indicates the input port.

This symbol indicates the output port.

This indicates the knob for adjusting the contrast.

This indicates the knob for adjusting the brightness.

CAUTION: Indicates a potentially hazardous situation which, if not avoided,

2.1 Cautions in Storage, Transportation and Installation

• Do not drag the device by its cables.

• Install the device in a place that will never be exposed to water.

2.2 Connecting the Device to a Wall Outlet and Handling

• Securely connect the mains plug into an outlet.

• To disconnect the mains plug, hold it.

2.3 Cautions during Use

• Never disassemble nor touch the inside of the device.

• Keep fingerprints and dust off of the measuring window.

ARK-710A / 光放射ｴﾈﾙｷﾞｰ / AR測定時

ARK-710A / 光放射ｴﾈﾙｷﾞｰ / KM測定時

*1 LA: Spectrally weighted photochemical aphakic source radiance

• Replace the fuses with the specified fuses only.

• Service work should be performed only by service persons authorized by NIDEK.

(Only marketed for or

TV monitor Auxiliary button cover

Display panel Locking knob

Used when an IOL-implanted eye or an eye Start button

Used to change modes to select whether to

Cylinder mode indication

Data to be compared with

Min. pupil marker

Eye level marker

LED for corneal illumination Chinrest

Power inlet Fuses

Chinrest knob TV monitor H control*4

*4 The LCD type monitor is not provided with these controls.

4.1 Operation Flow

4.3 Preparation for Measurement (p. 4-2)

→4.4 AR (refractive error), KM (corneal curvature radius) Measurements

5. PRINT OUT (p. 5-1)