CN1034711C - Infant Vision Tester - Google Patents

Abstract

The invention discloses an infant vision tester, which comprises a light source, a screen with markers of different sizes, a lens, a monitoring system and a spectroscope, wherein one beam of light split by the tester is turned by a right-angle prism for 180 degrees and then directly enters the monitoring system, and the other beam of light enters a tested eye for imaging and then enters the monitoring system after being reflected by the spectroscope. The invention is characterized in that a motor is utilized to drive a marker on a screen to move according to the visual dynamic tremor characteristics of eyes, and a monitoring system is used to observe whether the marker and the detected eye move synchronously, thereby judging the eyesight. The invention has simple structure and low cost, and is widely applicable to the visual detection of infants.

Description

Infant eyesight test instrument

The present invention relates to a kind of viseon tester, particularly a kind of infant eyesight test instrument of need not the measured expressing.

Present identifier's refraction of eye degree (vision), the most general method is to adopt visual acuity chart, pass through the ophthalmic refractive system imaging on retina according to the symbol on the visual acuity chart, express according to its meeting of seeing by the testee with language or gesture, to react the quality of its vision,, only adapt to the measured that can express sensation though this method is simple and convenient, and the gesture of can't term making peace is expressed, particularly infant but can not use.Utilize in the prior art instrument to the ophthalmic refractive degree test as Chinese patent CN85101007A disclosed " laser speckle refractor " and Chinese patent CN88219318.X disclosed " automatic laser rafractive ", their test philosophy mainly is to utilize the speckle effect of laser that the ophthalmic refractive degree is tested.The deficiency that these two kinds of instruments exist is that test must just can be carried out under the prerequisite that the measured understands method of testing, has so just increased many troubles to test process, in addition, watches speckle for a long time attentively and also easily makes eyestrain, influences measuring accuracy.April in 1991, the U.S. on the 30th patent USPN5011276 disclosed a kind of " measuring the instrument of eyes refracting power ", eyes will allow the measured pass through the moving object of one group of optical system observing far away from 3.5 meters with the characteristics of object of which movement when it proposes to utilize human eye that moving object is observed.This group optical system just also can be measured the movement display of tested eyeball the distance of the former axis of eyeball axis runout.But the optical system complexity that this patent is carried, test site requires to be at least 3.5 meters, the most critical issue is to monitor the tested oculomotor while, the motion of monitoring object simultaneously, therefore, whether also need the complicated electric control system of a cover to finish with the synchronous judgement of moving object to tested eye, the instrument cost is inevitable also very expensive, so neither be very practical.

The objective of the invention is at above-mentioned the deficiencies in the prior art provide a kind of do not need measured's self-expression, can be to tested eye and moving object is monitored simultaneously and system is simple, with low cost infant eyesight test instrument.

According to infant eyesight test instrument of the present invention, it comprises lighting source, has the transparent screen imaging len and the video system of different big or small density bullet things, it is characterized in that between transparent screen and imaging len, being provided with spectroscope along light path, tested eye is positioned at after the imaging len, on spectroscopical reflected light path, also be provided with and make turn back 180 ° corner cube prism of reflected light, surveillance is positioned at the reflected light of corner cube prism and the reflected light place of the tested eye that spectroscope reflects, and transparent screen is bent handle by one and is connected with motor.Its test philosophy is, the transparent screen of the illumination bright band density bullet thing that sends by lighting source, each point scattering luminous energy becomes an area source on the screen, because top density bullet thing absorbs luminous energy, so this density bullet thing is by spectroscope transmission and imaging len imaging on the retina of tested eye, density bullet thing after the imaging is to the vision of amphiblestroid subtended angle with regard to corresponding tested eye, and it enters half visual field of surveillance by the spectroscope reflection after reflection again.Enter half visual field in addition of surveillance again by 180 ° of corner cube prism turnovers through spectroscopical reflected light by density bullet thing on the screen of light source irradiation.Because transparent screen is connected with motor by a handle in the wrong, so it can move by the oscillation cycle that is used as of bending handle under the drive of motor, density bullet thing on the screen is movement therewith also, according to the apparent motion of the eyes characteristic of trembling, when tested eye is seen on the screen density bullet thing, just will be synchronized with the movement along with the density bullet thing, if tested eye be can't see the density bullet thing, then do not have this motion, so, the doctor can observe density bullet thing and tested eye simultaneously by surveillance, judges according to the situation of being synchronized with the movement whether tested eye sees the density bullet thing, to confirm its vision.Change the size of density bullet thing, just can change it, thereby reach the purpose that changes tested vision amphiblestroid subtended angle.

The present invention compared with prior art, its distinguishing feature is that (1) can observe moving object and tested eyes in same visual field, is easy to judge whether tested eye and moving object are synchronized with the movement, and promptly differentiate the vision of tested eye; (2) apparatus structure is simple, and is easy to use, do not need measured's self-expression and cost low, is easy to promote the use of.The present invention is widely used in baby or the intellectually challenged person's eyesight testing because of ability to accept and the common eyesight testing of understandability restriction can not carrying out.

Concrete structure of the present invention is provided by the following drawings and embodiment.

Accompanying drawing is the infant eyesight test instrument light path sketch map that proposes according to the present invention.

The invention will be further described below in conjunction with accompanying drawing.

With reference to accompanying drawing, infant eyesight test instrument is by light source (1), transparent screen (2), spectroscope (3), imaging len (4), corner cube prism (6), surveillance (7) and motor (9) are formed, the stain that has one group of different size on the transparent screen (2), the vision labelling of representing the different number of degrees, transparent screen (2) links to each other with motor (9) by a handle in the wrong (8), it can move by the oscillation cycle that is used as of bending handle (8) under motor (9) drives, the one side of spectroscope (3) is coated with semi-transparent semi-reflecting spectro film, the size of spectroscope (3) and position are to make reflection light field account for half of surveillance (7) visual field, angle at 45 is positioned on screen (2) light path afterwards, surveillance (7) both can be made up of ccd video camera and monitor, also can directly be observer's eyes, it is to be positioned at corner cube prism (6) and spectroscope (3) afterwards, receive by the object beam of corner cube prism (6) reflection with through the light beam that resembles of the tested eye of spectroscope (3) reflection object beam and resemble light beam and in surveillance, respectively account for a half field-of-view simultaneously.Change the diverse location of transparent screen (2), the size of stain in the visual field is changed, just can change stain to amphiblestroid subtended angle, thereby reach the purpose that changes the tested eye vision.Light source in the instrument (1), imaging len (4), corner cube prism (6) is the optical universal element.

Claims (4)

1, a kind of infant eyesight test instrument that is used for the vision quantitative test, it comprises lighting source [1], the transparent screen [2] that has different big or small density bullet things, imaging len [4] and surveillance [7], it is characterized in that between transparent screen [2] and imaging len [4], being provided with spectroscope [3] along light path, tested eye [5] is positioned at imaging len [4] afterwards, on the reflected light path of spectroscope [3], also be provided with and make turn back 180 ° corner cube prism [6] of reflected light, surveillance [7] is positioned at the reflected light of corner cube prism [6] and the reflected light place of the tested eye [5] that spectroscope [3] reflects, and transparent screen [2] is bent handle [8] by one and is connected with motor [9].

2, infant eyesight test instrument according to claim 1 is characterized in that surveillance [7] is made up of ccd video camera and monitor.

3, infant eyesight test instrument according to claim 1 is characterized in that surveillance [7] can directly be observer's eyes.

4, according to claim 1 or 2 or 3 described baby's viseon testers, it is characterized in that spectroscope [3] is coated with semi-transparent semi-reflecting spectro film, the size of spectroscope [3] and position are to make reflection light field account for half of surveillance [7] visual field.