JP2008284264A - Optometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optometer capable of preventing the increase in a power consumption in a glare test and easily incorporating an optotype added with new colors without enlarging an optometer whole body. <P>SOLUTION: This optometer 10 is provided with a glare light generation means 47 having a luminance higher than the luminance of a liquid crystal display panel 16 emitting a light by an illumination light source 17, and a control circuit 30 generates the glare light using the glare light generation means 47. A memory section 32 stores optotype data 33 indicating a plurality of optotypes 12 added with colors whose values of a contrast ratio to the liquid crystal display panel 16 illuminated by the illumination light source 17 are different, and the control circuit 30 extracts the optotype data 33 corresponding to the optotype 12 added with the color corresponding to the contrast ratio indicated in a command content, from the memory section 32, and outputs a control signal to display the optotype 12 indicated by the extracted optotype data 33 on the liquid crystal display panel 16, to an optotype presenting device 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optometry apparatus for examining the visual function of an eye to be examined.

  For example, when driving a car at night, the dazzling light from the headlights of an oncoming vehicle is irradiated to the eyes, or the surroundings become dark like at night, so the contrast between the surroundings and the object to be viewed decreases. Under the circumstances, the appearance of the object to be visually recognized is different from that in the situation where the surroundings are bright as in the daytime. For this reason, conventionally, an optometry apparatus for inspecting the visual function under such circumstances has been proposed (for example, see Patent Document 1).

  The optometry apparatus is provided separately from a display screen on which a target that is translucent and presented to an eye to be displayed is displayed, an illumination light source for illuminating the display screen, and the illumination light source. A glare light source for irradiating the subject's eye with light having a luminance higher than that of the display screen illuminated by the light source. Further, the optometry apparatus has a translucent optotype plate in which a plurality of optotypes each having a different contrast ratio value with respect to the display screen illuminated by the illumination light source are provided, and the optotype plate A target light source for irradiating the target plate with light so as to display each target shown on the display screen. Each target is formed on the target plate by vapor deposition, for example. The light emitted from the target light source to each target on the target plate enters the display screen from the back side through a prism, a mirror, and the like. Thereby, the image of the target irradiated with the light of the target light source is displayed on the display screen.

  In this optometry apparatus, a reference optotype with a contrast ratio value with respect to the display screen of each optotype is displayed on the display screen and a glare light source is applied to the eye to be examined. By confirming the appearance of the visual target on the display screen by the eye to be examined, it is possible to examine the visual function of the eye to be examined in a situation where dazzling light is irradiated on the eye to be examined.

In addition, the target displayed on the display screen by irradiating light from the target light source to the target with a color whose contrast ratio is smaller than that of the reference target. Inspecting the visual function of the subject's eye in a situation where the contrast between the surroundings and the visual target is low by checking the appearance of the target on the display screen by the subject's eye with a small difference in brightness Can do.
JP 2004-167230 A

  However, in order to perform a glare test that examines the visual function of the subject's eye under the condition that the subject's eye is illuminated with dazzling light, a glare light source dedicated to glare testing is separate from the illumination light source that illuminates the display screen Since it is used, at the time of the glare test, in addition to the power for turning on the illumination light source, the power for turning on the glare light source is required. For this reason, the power consumption during the glare test is increased as compared with the power consumption when the display screen is simply illuminated with the illumination light source without turning on the glare light source.

  In addition, in order to perform a contrast test for inspecting the visual function of the subject's eye in a situation where the contrast between the surroundings and the visual target object is low, a plurality of colors each having a different contrast ratio value with the display screen are attached. Since an optotype plate on which a target is recorded is used, when a target with a color different from the color of each target already written on the target plate is to be displayed on the display screen, It is necessary to replace the incorporated target plate with a target plate on which a new target is written. For this reason, the work for incorporating a new visual target into the optometry apparatus becomes complicated. Further, since the size of the target plate needs to be increased as the number of the target marks written on the target plate increases, the size of the entire optometry apparatus is increased.

  Accordingly, an object of the present invention is to prevent an increase in power consumption during a glare test, and to easily add a target with a new color without causing an increase in the size of the entire inspection apparatus. An object of the present invention is to provide an optometry apparatus that can be incorporated.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a display device having a liquid crystal display panel on which various targets to be presented to the eye to be displayed and an illumination light source for illuminating the liquid crystal display board. And a memory unit that stores target data indicating a plurality of targets having different contrast ratio values with respect to the liquid crystal display panel illuminated by the illumination light source, and an operation of the display device And a glare light generating means for generating glare light having a brightness higher than that of the liquid crystal display panel that emits light from the illumination light source, using the illumination light source, and the control When receiving an instruction to perform a contrast test for inspecting the visual function of the subject's eye in a situation where the contrast between the surroundings and the object to be viewed is low, the contrast indicated in the instruction content The target data with a color corresponding to a ratio is extracted from the memory unit, and a control signal for displaying the target indicated by the extracted target data on the liquid crystal display panel is output to the display device. When receiving an instruction to perform a glare test for inspecting the visual function of the eye under the condition that the dazzling light is applied to the eye, the glare light is generated using the glare light generating means. It is characterized by that.

  The invention according to claim 2 is the invention according to claim 1, wherein the glare light generating means is displayed on the liquid crystal display plate so as to cover the entire surface of the liquid crystal display plate, and in a non-display state. A test in which a window having a color whose brightness is lower than the color of the liquid crystal display panel when illuminated by the illumination light source and allowing the light of the liquid crystal display panel to emit light by the illumination light source is formed Test image data indicating the test image is stored in the memory unit. When the control unit receives an instruction to perform the glare test, the test image data is received from the memory unit. Data is extracted, and the test image indicated in the test image data is displayed on the liquid crystal display panel, and a control signal for displaying the target on the test image is output to the display device. Special To.

  According to a third aspect of the present invention, in the first aspect of the present invention, a light guide plate is arranged on the back side of the liquid crystal display plate so as to overlap the liquid crystal display plate, and each edge portion of the light guide plate In the vicinity of at least one of the edges, a plurality of illumination light sources including the illumination light source are arranged along the edge so that light enters the light guide plate from the edge. In addition, the edge corresponding to the edge of the light guide plate among the edges of the liquid crystal display panel is formed with an overhang that projects from the edge so as to cover the light sources for illumination, The glare light generating means is a covering image displayed on the overhanging portion so as to cover the entire surface of the overhanging portion and having a color that prevents transmission of light from each of the illumination light sources. The covering image data indicating is stored in the memory unit, the control unit When the glare test is not executed, the covering image data is extracted from the memory unit, the covering image is displayed on the overhanging portion, and when receiving an instruction to perform the glare test, the covering image is displayed. A control signal for removal from the overhanging portion is output to the display device.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the control unit receives an instruction to perform the glare test, the light amount of the illumination light source is changed. The operation of the light source for illumination is controlled so as to be maximized.

  According to the first aspect of the present invention, the optometry apparatus includes the glare light generating means for generating glare light having a luminance higher than that of the liquid crystal display panel that emits light by the illumination light source, using the illumination light source. The control unit, when receiving an instruction to perform the glare test, generates glare light using the glare light generating means.

  From this, the glare test can be performed using the light of the illumination light source for illuminating the liquid crystal display panel. Therefore, when performing the glare test, what is the illumination light source for illuminating the liquid crystal display panel? There is no need to turn on a glare light source exclusively for glare tests as in the prior art.

  Therefore, it is possible to reliably prevent the power consumption during the glare test from increasing as compared with the conventional power consumption when the liquid crystal display panel is simply illuminated by the illumination light source.

  In addition, target data indicating a plurality of targets with different contrast ratio values for the liquid crystal display panel illuminated by the illumination light source is stored in the memory unit, and the control unit performs a contrast test. When receiving an instruction to do so, the target data corresponding to the target with a color corresponding to the contrast ratio indicated in the instruction content is extracted from the memory unit, and the target indicated by the extracted target data is extracted. A control signal for displaying on the liquid crystal display panel is output to the display device.

  For this reason, in the present invention, the visual target is displayed on the display screen as in the case of using a conventional visual target plate on which a plurality of visual targets each having a different contrast ratio value with respect to the display screen are attached. Instead of displaying using a mechanical structure, the control signal is output from the control unit to the display device, so that a target with a color corresponding to the contrast ratio value indicated in the instruction content is displayed. It can be electrically displayed on the liquid crystal display panel.

  Thus, in order to newly display a target set with a color different from the color set for each target on the liquid crystal display board, to incorporate the target set with a new color into the optometry apparatus, It is sufficient to add the target data indicating the new target to the memory unit.

  Therefore, compared with the case where it is necessary to replace the target plate already incorporated in the optometry apparatus already written on the target plate with a target board on which a new target is written, a new target is added to the optometry apparatus. Can be reliably and easily incorporated.

  Further, by adding the target data to the memory unit, a target with a new color can be incorporated into the optometry apparatus, so that the amount of data stored in the memory unit increases, but the size of the memory unit itself is increased. Therefore, the overall size of the optometry apparatus as in the case of using a conventional optotype plate is not increased.

  According to the second aspect of the present invention, the glare light generating means is a test image displayed on the liquid crystal display plate so as to cover the entire surface of the liquid crystal display plate. The test image has a color whose brightness is lower than the color of the liquid crystal display panel when illuminated by the illumination light source in the non-display state, and the test image data indicating the test image is stored in the memory unit. . The test image is formed with a window portion that allows light to pass through the liquid crystal display panel that emits light from the illumination light source. Upon receiving an instruction to perform a glare test, the control unit extracts test image data from the memory unit, displays the test image indicated in the test image data on the liquid crystal display panel, and tests the target. A control signal for displaying on the image is output to the display device.

  From these things, in the state where the test image is displayed on the liquid crystal display panel, most of the light emitted from the illumination light source to the liquid crystal display panel is blocked by the test image, The lightness of the color of the liquid crystal display panel is lower than the lightness of the color when illuminated by the illumination light source in the non-display state, and becomes the lightness of the color of the test image as a whole. Further, part of the light emitted from the illumination light source to the liquid crystal display panel is emitted from the window formed in the test image toward the eye to be examined without being blocked by the test image.

  By emitting light from the liquid crystal display panel from the window portion, glare light having a brightness higher than the brightness of the liquid crystal display panel on which the test image is displayed over the entire surface, that is, the brightness of the light emitted by the color of the test image is emitted. Therefore, by irradiating the eye to be inspected with the light emitted from the window portion, the eye to be inspected can be placed under a situation in which dazzling light is irradiated when the surroundings are dark.

  According to the third aspect of the present invention, at least one of the edge portions of the light guide plate disposed on the back side of the liquid crystal display plate is in the vicinity of the edge portion, and light is emitted from the edge portion in the light guide plate. A plurality of light sources for illumination are arranged along the edge portion, and an edge portion corresponding to the edge portion of the light guide plate among the edge portions of the liquid crystal display panel is provided from the edge portion. An overhanging portion is formed so as to cover the light source for use. The glare light generating means is a covering image displayed on the overhanging portion so as to cover the entire overhanging portion. The cover image has a color that prevents transmission of light from each illumination light source, and cover image data indicating the cover image is stored in the memory unit. When the glare test is not executed, the control unit extracts the cover image data from the memory unit, displays the cover image on the overhanging unit, and receives the instruction to perform the glare test, the cover unit displays the cover image. A control signal to be removed from is output to the display device.

  For these reasons, when the glare test is not performed, the light emitted from each illumination light source is incident on the liquid crystal display panel from the back side through the light guide plate without passing through the protruding portion. . On the other hand, when the glare test is performed, since the covering image is removed from the overhanging portion, light is allowed to pass through the overhanging portion, so that it is emitted from each illumination light source without passing through the light guide plate. Light incident on the overhanging portion passes through the overhanging portion from the back side to the surface side.

  Since the luminance of the light emitted through the overhanging portion is higher than the luminance of the light emitted through the light guide plate and the liquid crystal display plate, it is possible to generate glare light having a luminance higher than that of the liquid crystal display plate. it can.

  Therefore, by irradiating the eye to be inspected with the light emitted through the overhanging portion, the eye to be inspected can be placed under a situation in which dazzling light is irradiated.

  According to the fourth aspect of the present invention, the control unit controls the operation of the illumination light source to maximize the amount of light of the illumination light source when receiving an instruction to perform a glare test. When the test image is displayed on the plate, the brightness of the glare light emitted from the window portion formed in the test image can be increased, and the projecting portion is formed on the liquid crystal display plate In addition, the luminance of the glare light emitted from the overhanging portion can be increased.

  As a result, when glare light is applied to the subject's eye, the subject's eye can be placed in a situation that is closer to the situation in which the dazzling light from the headlight of the oncoming vehicle is applied to the eye when driving the vehicle at night. .

  The present invention will be described with reference to the illustrated embodiments.

  FIG. 1 shows an example in which the present invention is applied to a subjective optometry apparatus 10 for examining the visual function of a subject's eye based on the subjective judgment of a subject 11.

  As shown in FIG. 1, an optometry apparatus 10 according to the present invention corrects the visual function of an eye to be examined, and an optotype presenting apparatus 13 for presenting various visual targets 12 to the eye of a subject 11. The correction device 14 is provided.

  The optotype presenting device 13 is disposed to face the subject 11. In the example shown in FIG. 2, the housing 15, the liquid crystal display plate 16 on which the optotype 12 is displayed, and the liquid crystal display plate are illuminated. A plurality of illumination light sources 17 and a light guide plate 18.

  An opening 19 is formed in the peripheral wall 15 a facing the subject among the plurality of peripheral walls of the housing 15.

  The liquid crystal display panel 16 is disposed in the opening 19 of the housing 15 so that its display surface faces the subject 11. The target 12 displayed on the liquid crystal display panel 16 is selected by an operation of the controller 26 described later.

  The light guide plate 18 is made of a light-transmitting material such as an acrylic plate, and is disposed in the housing 15 so as to be substantially parallel to the liquid crystal display plate on the back side of the liquid crystal display plate 16. A reflective sheet 20 is provided on the back surface 18b of the light guide plate 18 on the side opposite to the surface 18a on the liquid crystal display plate 16 side so as to cover the entire surface of the back surface.

  In the illustrated example, each of the illumination light sources 17 is configured by an LED, for example, and is arranged along the respective edges in the vicinity of the left and right edges 18c of the light guide plate 18 as viewed in FIG. As is well known, the light emitted from each illumination light source 17 enters the light guide plate 18 from each edge 18c and is totally reflected in the light guide plate 18 to reach the entire area of the light guide plate. Led. The light guided into the light guide plate 18 changes its path by being reflected by the reflection sheet 20, and is incident on the surface 18a of the light guide plate 18 at an angle smaller than the total reflection angle. It is emitted toward Thereby, the liquid crystal display panel 16 is illuminated from the back side by the light of each illumination light source 17 emitted through the light guide plate 18. In a state where the liquid crystal display panel 16 is illuminated by each illumination light source 17, the color of the liquid crystal display panel 16 is white in the illustrated example.

  As shown in FIG. 1, the correction device 14 is attached to an arm 22 provided on an optometry table 21 disposed between the optotype presenting device 13 and the subject 11, and is arranged side by side in the left-right direction. A pair of phoropters 23 is provided.

  Each phoropter 23 includes a housing 25 in which an optometry window 24 is formed. Although not shown in the drawings, each housing 25 accommodates an annular lens disk in which a plurality of correction lenses having different refractive powers are provided along the circumferential direction. Each correction lens is selectively disposed in each optometry window 24 by the rotation of the lens disk under the control of the controller 26.

  Furthermore, the optometry apparatus 10 according to the present invention includes the above-described controller 26 for controlling the operations of the correction apparatus 14 and the optotype presenting apparatus 13.

  As shown in FIG. 3, the controller 26 includes an operation unit 28 operated by an examiner 27 (see FIG. 1) and a display unit 29 on which an operation image described later for the operation unit is displayed.

  As shown in FIG. 4, the controller 26 includes a control circuit 30 that controls the operations of the optotype presenting apparatus 13, the correction apparatus 14, and the display unit 29 based on the operation of the operation unit 28, the display unit 29, the optotype. An image output unit 31 connected to the presentation device 13 and the control circuit 30 and a memory unit 32 are included.

  The memory unit 32 includes target data 33 indicating various targets 12 used for various examinations, operation image data 34 indicating the above-described operation images, spherical power, astigmatism power, and axial angle of each correction lens. The lens data 35 indicating the value of the refractive power such as is stored. Further, the memory unit 32 stores luminance data 53 indicating the luminance of each illumination light source 17. In the example shown in the figure, the luminance shown in the luminance data 53 is stored in 10 steps, and the numerical value N1 indicating the highest luminance level is “10”.

  The optotype data 33 includes data indicating the visual acuity test target 12a used for the visual acuity test of the eye to be examined. As shown in FIG. 5, the visual acuity test target 12 a is composed of a well-known Landolt ring 12 b composed of a letter “C”. Each Landolt ring 12b has a size corresponding to the test visual acuity value S for each visual acuity value S (hereinafter referred to as the test visual acuity value S) of the eye to be examined. The inspection visual acuity value S decreases as the inspection visual acuity value S increases. Further, each Landolt ring 12b is divided into a plurality of target groups 12c in the illustrated example. Each Landolt ring 12b constituting each target group 12c has a size corresponding to a different inspection visual acuity value S. Each Landolt ring 12b has a different color for each target group 12c. The color of each target group 12c is set so that the contrast ratio value for the color of the liquid crystal display panel 16 illuminated by each illumination light source 17 is different for each target group 12c. In the illustrated example, the values of the contrast ratio are divided into 10 levels, that is, the number of the target groups 12c is ten, and each target group 12c has the contrast ratio of the color set for each target group 12c. A numerical value N2 indicating the stage is attached. The numerical value N2 indicating the stage when the contrast ratio value is the largest is “10”, and the color of the visual target group 12c corresponding to that stage is black. The color of each optotype group 12c corresponding to the stage “9” and subsequent stages changes in order according to a gradation along a well-known gray scale as the numerical value N2 decreases.

  As shown in FIGS. 3 and 4, the operation unit 28 is rotated when changing numerical values such as a spherical power, an astigmatic power, and an axis angle displayed in a refractive power display field 40 of a display screen 39 described later. And a test visual acuity value change switch 36 for changing the test visual acuity value S of the visual acuity test target 12 a displayed on the liquid crystal display panel 16. Further, the operation unit 28 has an ON state in which a glare test for inspecting the visual function of the eye to be inspected under a condition where bright light is irradiated on the eye to be examined, and an OFF state in which the glare test is not executed. A glare test switch 37 for switching between states is provided. Further, the operation unit 28 is provided with a brightness adjustment switch 54 for adjusting the brightness of each illumination light source 17. Further, the contrast ratio of the visual target 12 with respect to the liquid crystal display panel 16 is executed on the operation unit 28 when executing a contrast test for examining the visual function of the subject's eye in a situation where the contrast between the surroundings and the visual target object is low. A contrast change switch 38 is provided for changing the value of.

  The display unit 29 has the display screen 39 on which an operation image showing the contents set by operating each switch of the operation unit 28 is displayed.

  The display screen 39 is composed of a liquid crystal panel in the illustrated example. As shown in FIG. 6, the display screen 39 displays the refractive power display column 40 in which the refractive power such as the spherical power, the astigmatic power, and the axial angle of the correction lens is displayed, and the liquid crystal display of the target presentation unit 13. A list display field 42 for displaying a list of a plurality of target images 41 indicating the target 12 displayed on the board 16 is provided.

  In addition, the selected target 12 is displayed on the display screen 39 so that the examiner 27 can confirm the target 12 corresponding to the target image 41 selected from the list display field 42 as described later. A target display column 43 to be displayed is provided.

  Images indicating the refractive power display column 40, the list display column 42, and the target display column 43, and the target images 41 are included in the operation image data 34 stored in the memory unit 32, respectively.

  In the present embodiment, a touch panel (not shown) is provided on the display screen 39. The touch panel is arranged on the list display field 42, and although not shown, as is well known in the art, a plurality of conductive film stripes are formed in parallel to each other, and a transparent film provided with resistance films at both ends is provided. It is formed by bonding a pair of panel members such as a film and glass so that the conductive film stripes are orthogonal to each other.

  When the surface of the touch panel is pressed, the conductive film stripes formed on the panel members are electrically connected to each other so that they are electrically connected to each other. The touch sensor 44 (FIG. 5) indicates that any one of the plurality of conductive film stripes of the panel member is in contact with any one of the plurality of conductive film stripes of the other panel member. 4). Thereby, the pressed position of the touch panel is specified.

  Accordingly, for example, by pressing the target image 41 indicating the target 12 used for the inspection from among the respective target images 41 of the list display field 42 displayed on the display screen 39 from the display screen 39, the target used for the inspection. 12 can be selected from the list display column 42. When the touch sensor 44 detects the pressed position, the touch sensor 44 outputs a detection signal indicating the pressed position to the control circuit 30.

  As illustrated in FIG. 4, the control circuit 30 includes a determination unit 45 connected to the operation unit 28 and the touch sensor 44, and an extraction unit 46 connected to the memory unit 32.

  The determination unit 45 receives operation signals from the operation unit 28 indicating that the dial D, the inspection visual value change switch 36, the brightness adjustment switch 54, and the contrast change switch 38 of the operation unit 28 have been operated, and these operation signals are used as the operation signals. Based on this, the operation positions of the dial D, the inspection visual acuity value change switch 36, the brightness adjustment switch 54, and the contrast change switch 38 are determined, and signals indicating the respective determination results are output to the extraction unit 46.

  In addition, the determination unit 45 receives an operation signal indicating that the glare test switch 37 has been operated from the operation unit 28, and outputs a detection signal indicating that to the extraction unit 46.

  Further, the determination unit 45 receives a detection signal indicating the pressed position from the touch sensor 44, and determines which target image 41 is the target image 41 selected based on the detection signal.

  For example, when the power of the optometry apparatus 10 is switched from the OFF state to the ON state, the determination unit 45 determines that fact and outputs a signal indicating that to the extraction unit 46.

  When the extraction unit 46 receives a signal from the determination unit 45 when the power of the optometry apparatus 10 is switched from the OFF state to the ON state, the extraction unit 46 reads the operation image data 34 from the memory unit 32 and reads the operation image data. An operation image signal to be displayed on the display screen 39 is output to the display unit 29 via the image output unit 31. Thereby, on the display screen 39 of the display unit 29, the refractive power display column 40, each target image 41, the list display column 42, and the target display column 43 included in the operation image data 34 are respectively shown in FIG. Is displayed.

  Further, the extraction unit 46, based on the signals indicating the operation positions of the luminance adjustment switch 54 and the contrast change switch 38 received from the determination unit 45, is a numerical value N1 indicating each stage of the luminance and contrast ratio according to each operation position. , N2 are extracted from the memory unit 32, and image signals indicating that the extracted numerical values N1, N2 are displayed on the display screen 39 are output to the display unit 29 via the image output unit 31, respectively. As a result, the display screen 39 of the display unit 29 has numerical values N1 and N2 indicating the levels of the brightness and contrast ratio corresponding to the respective operation positions of the brightness adjustment switch 54 and the contrast change switch 38 as shown in FIG. Is displayed. In the illustrated example, the luminance of each illumination light source 17 is represented by “BRT”, and the contrast ratio is represented by “CNT”.

  Further, the extraction unit 46 extracts lens data 35 indicating the refractive power corresponding to the operation position from the memory unit 32 based on the signal indicating the operation position of the dial D received from the determination unit 45, and the extracted lens data 35 is A control signal indicating that the correcting lens having the indicated refractive power is disposed in the optometry window 24 of each phoropter 23 is output to the correcting device 14 via the image output unit 31, and further, the refractive power included in the operation image data 34 A refractive power image signal indicating that the refractive power indicated by the lens data 35 is displayed in the display column 40 is output to the display unit 29 via the image output unit 31. Thereby, the correction lens having the refractive power selected by the operation of the dial D is arranged in the optometry window 24 of each phoropter 23. Further, in the refractive power display column 40, as shown in FIG. 6, the refractive power value of the correcting lens selected by operating the dial D is displayed.

  The extraction unit 46 extracts data corresponding to the signal from the memory unit 32 based on the signal indicating the determination result received from the determination unit 45 and the detection signal.

  Further, the optometry apparatus 10 according to the present invention uses the respective illumination light sources 17 to generate the glare light having a luminance higher than that of the liquid crystal display panel 16 that emits light from each illumination light source 17. 47.

  As shown in FIG. 7, the glare light generating means 47 includes a test image 48 displayed on the liquid crystal display panel 16 so as to cover the entire surface of the liquid crystal display panel.

  The test image 48 has a color lower in brightness than the color of the liquid crystal display panel 16 when illuminated by the illumination light sources 17 in a non-display state, that is, white in the illustrated example. The test image 48 is displayed on the liquid crystal display panel 16 by operating the glare test switch 37. In the test image 48, a pair of windows 50 that allow the light transmitted through the liquid crystal display panel 16 to emit light from each illumination light source 17 is formed. Each window part 50 is arrange | positioned at intervals along the left-right direction of the liquid crystal display panel 16, respectively. The test image data 49 indicating the test image 48 is stored in the memory unit 32 as shown in FIG.

  Hereinafter, the control action by the control circuit 30 when examining the visual acuity value of the eye to be examined will be described based on the flowchart of FIG.

  When the control circuit 30 receives the detection signal from the touch sensor 44 by the determination unit 45, the visual target image 41 selected from the list display column 42 based on the pressed position indicated by the detection signal is the visual acuity test target 12a. Is determined by the determination unit 45 (step S1).

  When the determination unit 45 determines that the visual target image 41 selected from the list display field 42 is other than the visual acuity test target 12a, the control circuit 30 extracts a signal indicating the type of the determined visual target image 41. It outputs to the part 46 (step S2).

  When a signal indicating a target image 41 of a type other than the visual target 12a is output from the determination unit 45 to the extraction unit 46, the control circuit 30 displays the target 12 corresponding to the target image 41. The target data 33 is extracted from the memory unit 32 by the extraction unit 46 (step S3).

  The control circuit 30 outputs a target image signal indicating that the target 12 indicated by the extracted target data 33 is displayed on the target display column 43 from the extraction unit 46 to the display unit 29 via the image output unit 31. Further, a target image signal to be displayed on the liquid crystal display panel 16 is output from the extraction unit 46 to the target presentation device 13 via the image output unit 31 (step S4).

  Thereby, the target 12 corresponding to the target image 41 selected from the list display column 42 is displayed on the target display column 43 of the display unit 29 and the liquid crystal display panel 16 of the target presentation device 13. .

  When the control circuit 30 determines in step S1 that the selected visual target image 41 is the visual acuity test target 12a, the glare test switch 37 is turned on based on an operation signal received from the glare test switch 37. It is determined by the determination unit 45 whether or not it is placed (step S5).

  When the determination unit 45 determines that the glare test switch 37 is in the OFF state, the control circuit 30 determines that the operation position of the contrast change switch 38 is based on the operation signal received from the contrast change switch 38 and the contrast ratio. The determination unit 45 determines whether or not the operation position is the maximum, that is, the operation position for setting the color of the Landolt ring 12b displayed on the liquid crystal display panel 16 to black (step S6).

  When the determination unit 45 determines that the operation position of the contrast change switch 38 is the maximum operation position at which the contrast ratio is maximized, the control circuit 30 performs the inspection based on the operation signal received from the inspection visual acuity value change switch 36. The determination unit 45 determines the inspection visual acuity value S selected by operating the visual acuity value change switch, and outputs a signal indicating the determined inspection visual acuity value S to the extraction unit 46 (step S7).

  When a signal indicating the inspection visual acuity value S is output from the determination unit 45 to the extraction unit 46, the control circuit 30 stores target data 33 indicating the Landolt ring 12 b having a size corresponding to the inspection visual acuity value S in the memory unit 32. Is extracted by the extraction unit 46 (step S8).

  At this time, in the illustrated example, the extraction unit 46 configures the target group 12c to which a color having the highest contrast ratio with respect to the liquid crystal display panel 16 is attached among the plurality of target groups 12c stored in the memory unit 32. The target data 33 indicating the Landolt ring 12b corresponding to the inspection visual acuity value S determined by the determination unit 45 is extracted from each Landolt ring 12b, that is, each Landolt ring 12b whose color is black.

  The control circuit 30 sends a target image signal indicating that the Landolt ring 12b indicated by the target data 33 extracted by the extraction unit 46 is displayed on the target display column 43 from the extraction unit 46 to the display unit 29 via the image output unit 31. Further, a target image signal to be displayed on the liquid crystal display panel 16 is output from the extraction unit 46 to the target presentation device 13 via the image output unit 31 (step S9).

  As a result, the visual target display field 43 of the display unit 29 and the liquid crystal display panel 16 of the visual target presentation device 13 are selected from the list display field 42 and changed to the inspection visual acuity value as shown in FIGS. A black Landolt ring 12b corresponding to the inspection visual acuity value S corresponding to the operation position of the switch 36 is displayed. Since the black Landolt ring 12b is displayed on the white liquid crystal display panel 16, the Landolt ring 12b can be seen most clearly when the Landolt ring 12b is displayed on the liquid crystal display panel 16.

  In step S6, the control circuit 30 sets the contrast change switch 38 to an operation position other than the maximum operation position, that is, the color of the Landolt ring 12b displayed on the liquid crystal display panel 16 is higher than that of the black color. When the determination unit 45 determines that the operation position is a small color, the operation position selected from the inspection visual value change switch 36 and the contrast change switch 38 is selected by operating the inspection visual value change switch 36. The determination unit 45 determines the inspection visual acuity value S and the contrast ratio value selected by operating the contrast change switch 38, and outputs a signal indicating the determined inspection visual acuity value S and contrast ratio value to the extraction unit 46 ( Step S10).

  When a signal indicating the inspection visual acuity value S and the contrast ratio value is output from the determination unit 45 to the extraction unit 46, the control circuit 30 is given a color corresponding to the contrast ratio selected by operating the contrast change switch 38. The target data 33 indicating the Landolt ring 12b having a size corresponding to the inspection visual acuity value S among the plurality of Landolt rings 12b constituting the target group 12c is extracted from the memory unit 32 by the extraction unit 46 (step S11). The process proceeds to step S9.

  As a result, the Landolt ring 12b selected from the list display field 42 is displayed in the target display field 43 of the display unit 29 as shown in FIG. As shown in FIG. 9, the Landolt ring 12 b is selected from the list display field 42 and corresponds to the test visual acuity value S corresponding to the operation position of the test visual acuity value change switch 36, and is selected by operating the contrast change switch 38. A color Landolt ring 12b is displayed. By displaying the Landolt ring 12b having a small contrast ratio with respect to the liquid crystal display panel 16 on the liquid crystal display panel 16, a situation in which the contrast between the surroundings and the object to be viewed is lowered, such as at night, is created.

  On the other hand, if the determination circuit 45 determines that the glare test switch 37 is in the ON state in step S5, that is, if the control circuit 30 receives an instruction to perform the glare test, the control circuit 30 receives from the contrast change switch 38. Based on the operation signal, the determination unit 45 determines whether or not the contrast change switch 38 is in the maximum operation position (step S12).

  When the determination unit 45 determines that the contrast change switch 38 is in the maximum operation position, the control circuit 30 operates the inspection visual value change switch based on an operation signal received from the inspection visual value change switch 36. The determination visual acuity value S selected by the determination unit 45 is determined (step S13).

  Next, the control circuit 30 checks the visual acuity value S determined by the determination unit 45 together with a detection signal indicating that the glare test switch 37 is in the ON state and the contrast change switch 38 is in the maximum operation position. Is output to the extraction unit 46 (step S14).

  When the control circuit 30 outputs a signal indicating the inspection visual acuity value S together with the detection signal from the determination unit 45 to the extraction unit 46, the control circuit 30 extracts the test image data 49 from the memory unit 32 by the extraction unit 46, and further, the inspection visual acuity value The target data 33 indicating the Landolt ring 12b having a size corresponding to S is extracted from the memory unit 32 by the extraction unit 46 (step S15).

  At this time, in the example shown in the drawing, the extraction unit 46 is included in each Landolt ring 12b constituting the target group 12c in which a predetermined color other than black is set among the target groups 12c stored in the memory unit 32. Then, the target data 33 indicating the Landolt ring 12b corresponding to the inspection visual acuity value S determined by the determination unit 45 is extracted. The predetermined color is composed of, for example, gray that is closest to white among the colors set for each visual target group 12c.

  The control circuit 30 sends an image output unit 31 from the extraction unit 46 to the target presentation device 13 for a control signal for displaying the test image 48 indicated by the test image data 49 extracted by the extraction unit 46 on the liquid crystal display panel 16. Furthermore, a target image signal for displaying the Landolt ring 12b indicated by the target data 33 extracted by the extraction unit 46 on the target display column 43 and the liquid crystal display panel 16 is displayed from the extraction unit 46 to the display unit. 29 and the target presentation device 13 through the image output unit 31 (step S16).

  At this time, the extraction unit 46 displays the Landolt ring 12 b on the liquid crystal display panel 16 on the test image 48 between the windows 50.

  As a result, as shown in FIG. 6, the Landolt ring 12b selected from the list display field 42 is displayed in the target display field 43 of the display unit 29, and the liquid crystal display board 16 of the target display device 13 displays the figure. 7, the Landolt ring 12b having a size corresponding to the test visual acuity value S corresponding to the operation position of the test image 48 and the test visual acuity value change switch 36 and having the predetermined color is the test image. 48 is displayed.

  In a state in which the test image 48 is displayed on the liquid crystal display panel 16, most of the light emitted from each illumination light source 17 to the liquid crystal display panel 16 is blocked from being transmitted through the liquid crystal display panel 16 by the test image 48. Thus, the brightness of the color of the liquid crystal display panel 16 is lower than the color when illuminated by each illumination light source 17 in the non-display state, that is, the brightness of white, and the color of the test image 48, that is, the brightness of black as a whole. It becomes. Further, a part of the light emitted from each illumination light source 17 to the liquid crystal display panel 16 is not obstructed by the test image 48 and is directed from the respective window portions 50 formed in the test image toward the eye to be examined. Emitted.

  Accordingly, it is possible to generate glare light having luminance higher than the luminance of the liquid crystal display panel 16 on which the test image 48 is displayed over the entire surface, that is, the luminance of light emitted from the color of the test image 48. By irradiating the eye to be inspected with the light emitted from the window 50, the eye to be inspected can be placed under a situation where bright light is irradiated when the surroundings are dark.

  On the other hand, if the determination unit 45 determines in step S12 that the contrast change switch 38 is in an operation position other than the maximum operation position, first, the control visual acuity value change switch 36 and the contrast change switch The determination unit 45 determines the inspection visual acuity value S selected by the operation of the inspection visual acuity value change switch 36 and the contrast ratio value selected by the operation of the contrast change switch 38 based on the operation signal received from each of 38. (Step S17).

  Next, the control circuit 30 outputs a signal indicating the determined examination visual acuity value S and contrast ratio value to the extraction unit 46 together with a detection signal indicating that the glare test switch 37 is in the ON state (step S40). S18).

  When the control circuit 30 outputs a signal indicating the inspection visual acuity value S and the contrast ratio together with the detection signal from the determination unit 45 to the extraction unit 46, the control circuit 30 extracts the test image data 49 from the memory unit 32 by the extraction unit 46. Further, the Landolt ring having a size corresponding to the inspection visual acuity value S among the plurality of Landolt rings 12b constituting the target group 12c colored with the color corresponding to the contrast ratio selected by the operation of the contrast change switch 38. The target data 33 indicating 12b is extracted from the memory unit 32 by the extraction unit 46 (step S19), and the process proceeds to step S16.

  At this time, the extraction unit 46 displays the Landolt ring 12b on the liquid crystal display panel 16 between the windows 50 on the test image 48, as described above.

  As a result, as shown in FIG. 6, the Landolt ring 12b selected from the list display field 42 is displayed in the target display field 43 of the display unit 29, and the liquid crystal display board 16 of the target display device 13 displays the figure. As shown in FIG. 10, the test image 48 has a size corresponding to the test visual acuity value S corresponding to the operation position of the test visual acuity value change switch 36, and a color corresponding to the operation position of the contrast change switch 38. The Landolt ring 12b is displayed on the test image 48.

  When performing the contrast test using the optometry apparatus 10 according to the present invention, the examiner 27 first places the Landolt ring 12b on the subject 11 while the black Landolt ring 12b is displayed on the liquid crystal display panel 16. The subject 11 is informed of the appearance of each Landolt ring 12b while changing the size of the Landolt ring 12b by operating the inspection visual acuity value change switch 36. Next, the examiner 27 operates the contrast change switch 38 to change the color of the Landolt ring 12b so as to approach the color of the liquid crystal display panel 16, that is, white. At this time, the display of the numerical value N2 indicating the level of the contrast ratio displayed on the display screen 39 of the display unit 29 is switched to the numerical value N2 corresponding to the operation position of the contrast change switch 38 under the control of the control circuit 30. In the state where the color of the Landolt ring 12b is changed, the subject 11 is made to see the Landolt ring 12b again, and the subject 11 is asked about the appearance of the Landolt ring 12b having a different size. Thereafter, the examiner 27 sequentially changes the color of the Landolt ring 12b with respect to the liquid crystal display panel 16 by operating the contrast change switch 38, and asks the examinee 11 of the appearance of the Landolt ring 12b for each different color. As a result, the visual function of the eye to be examined when the contrast ratio value with respect to the liquid crystal display panel 16 is the largest, that is, when the visual target 12 is most clearly visible, and the vision of the eye to be examined in a situation where the contrast ratio value has become small. The difference with the function can be confirmed.

  Thereafter, the examiner 27 causes the subject 11 to see the Landolt ring 12b of each size through the respective correction lenses arranged in the respective optometry windows 24, and based on the response of the subject 11, each optometry window The correction lens disposed in the switch 24 is switched by operating the dial D of the operation unit 28. At this time, since the lens data 35 of the correction lens selected by operating the dial D is displayed in the refractive power display column 40 of the display unit 29 as described above, the examiner 27 visually recognizes the lens data 35. Then, the dial D can be operated. By switching the correction lens, the visual function of the eye to be examined is corrected, and the refractive power of the eyeglass lens to be created can be determined.

  Further, when performing the glare test using the optometry apparatus 10 according to the present invention, the examiner 27 displays the test image 48 on the liquid crystal display panel 16 by turning on the glare test switch 37, and each window portion. The test target 11 is seen by the subject 11 in a state where the light emitted from the eye 50 is irradiated on the subject's eye, and the appearance is heard. Thereby, the visual function of the eye to be examined under the condition where the dazzling light is irradiated can be examined. At this time, the examiner 27 can change the luminance of each illumination light source 17 by operating the luminance adjustment switch 54 and inspect the visual function of the eye to be inspected at each level of luminance.

  Thereafter, as described above, the examiner 27 causes the subject to view the target 12 through the correction lenses arranged in the optometry windows 24, and dials the dial D based on the response of the subject 11. By switching the correction lens by operation, it is possible to determine the refractive power of the eyeglass lens to be created.

  Further, by reducing the contrast ratio value of the Landolt ring 12b with respect to the liquid crystal display panel 16 by operating the contrast change switch 38 in a state where the light from each window 50 is irradiated on the eye to be examined, for example, during night driving. It is possible to more realistically create a situation in which the dazzling light of the headlight of the oncoming vehicle is irradiated to the eyes.

  According to the present embodiment, as described above, the light for each illumination light source 17 emitted from each window 50 formed in the test image 48 displayed on the liquid crystal display panel 16 is applied to the entire surface of the test image 48. Since it can be used as glare light having a brightness higher than the brightness of the liquid crystal display panel 16 displayed over the conventional display, it is conventional in addition to the illumination light source 17 for illuminating the liquid crystal display board 16 when performing a glare test. It is not necessary to turn on a glare light source dedicated for glare testing.

  Therefore, it is possible to reliably prevent the power consumption during the glare test from increasing as compared with the conventional power consumption when the liquid crystal display panel 16 is simply illuminated by the illumination light source 17. it can.

  In addition, target data 33 indicating a plurality of targets 12 having different contrast ratio values with respect to the liquid crystal display panel 16 illuminated by the illumination light source 17 is stored in the memory unit 32, and a control circuit is provided. 30, when the determination unit 45 receives from the contrast change switch 38 a signal indicating that the contrast ratio value of the target 12 displayed on the liquid crystal display panel 16 with respect to the liquid crystal display panel 16 is reduced, that is, the determination unit 45 performs a contrast test. Is received from the memory unit 32, the target 12 indicated by the extracted target data 33 is extracted. A control signal for displaying on the liquid crystal display panel 16 is output to the optotype presenting apparatus 13.

  From this, the mechanical structure of the visual target on the display screen as in the case of using a conventional visual target plate on which a plurality of visual targets with different colors with different contrast ratio values is attached. The control signal is output from the control circuit 30 to the optotype presenting device 13, and the optotype 12 with the color corresponding to the contrast ratio indicated in the instruction content is displayed on the liquid crystal. It can be electrically displayed on the display panel 16.

  Thus, in order to newly display the optotype 12 with a color different from the color attached to each optotype 12 on the liquid crystal display panel 16, the target 12 with a new color is incorporated into the optometry apparatus 10. It is sufficient to add the target data 33 indicating the target 12 of the new color to the memory unit 32.

  Therefore, compared with the case where it is necessary to replace the optotype plate already incorporated in the optometry apparatus already written on the optotype board with the optotype board on which the new optotype is written, a new vision is displayed on the optometry apparatus 10. The mark 12 can be reliably and easily incorporated.

  Further, since the new optotype 12 can be incorporated into the optometry apparatus 10 by adding the optotype data 33 to the memory unit 32, the amount of data stored in the memory unit 32 increases, but the size of the memory unit 32 itself is increased. Therefore, the overall size of the optometry apparatus 10 is not increased as in the case of using a conventional target plate.

  Further, as described above, a part of the light emitted from each illumination light source 17 to the liquid crystal display panel 16 is directed from each window 50 of the test image 48 displayed on the liquid crystal display panel 16 toward the eye to be examined. By emitting the light, it is possible to generate glare light having a brightness higher than the brightness of the liquid crystal display panel 16 on which the test image 48 is displayed over the entire surface, that is, the brightness of the light emitted from the color of the test image 48. Thereby, by irradiating the eye to be inspected with the light emitted from each window part 50, the eye to be inspected can be easily placed under a situation in which dazzling light is irradiated when the surroundings are dark.

  In the present embodiment, as shown in FIG. 11, a display window 54 for displaying the visual target 12 during the glare test can be formed in the test image 48.

  In the illustrated example, when the determination unit 45 determines that the operation position of the contrast change switch 38 is the maximum operation position, the control circuit 30 presents the optotype to display the black Landolt ring 12b on the display window 54. When the operation of the device 13 is controlled and the determination unit 45 determines that the operation position of the contrast change switch 38 is an operation position other than the maximum operation position, the Landolt ring 12b of the color corresponding to the operation position is shown in FIG. The operation of the optotype presenting apparatus 13 is controlled to display as shown in FIG.

  Further, in this embodiment, an example is shown in which the glare light generating means 47 is configured with a test image 48 displayed on the liquid crystal display panel 16 so as to cover the entire surface of the liquid crystal display panel during the glare test. Instead, as shown in FIGS. 12 (a) and 12 (b), each edge 16a corresponding to each edge 18c of the light guide plate 18 among the edges of the liquid crystal display panel 16 is respectively Overhang portions 51 are formed so as to cover the liquid crystal display panel 16 so as to cover the illumination light sources 17 from the respective edges, and the glare light generating means 47 is connected to the respective overhang portions 51. The covering image 52 displayed so as to cover the entire surface can be formed.

  In the illustrated example, each overhanging portion 51 is formed of a liquid crystal panel similar to the liquid crystal display plate 16 and is formed integrally with the liquid crystal display plate 16. The cover image 52 has a color that prevents transmission of light from each illumination light source 17. In the illustrated example, the cover image 52 is black. Cover image data (not shown) indicating the cover image 52 is stored in the memory unit 32 in the same manner as the test image data 49. Further, in the illustrated example, the light source 17 for illumination is sandwiched between the projecting portions 51 from both ends of the reflection sheet 20 provided on the light guide plate 18 in the left-right direction. An extending portion 20a that extends is formed.

  In this case, when the determination unit 45 determines that the glare test is not being executed, that is, when the determination unit 45 determines that the glare test switch 37 is in the OFF state, the control circuit 30 extracts a signal indicating that from the determination unit 45. Output to 46.

  When a signal indicating that the glare test switch 37 is in the OFF state is output from the determination unit 45 to the extraction unit 46, the control circuit 30 extracts the covering image data from the memory unit 32 by the extraction unit 46. Then, a control signal indicating that the covering image 52 indicated by the extracted covering image data is displayed on each overhanging portion 51 is output from the extracting portion 46 to the target presentation device 13 via the image output portion 31. Thereby, as shown in FIG.12 (b), each covering image 52 is displayed on each overhang | projection part 51, respectively. Therefore, when the glare test is not performed, most of the light emitted from each illumination light source 17 does not pass through each overhang 51 and passes through the light guide plate 18 to the liquid crystal display plate 16. Incident from the back side.

  On the other hand, when the determination unit 45 determines that the glare test switch 37 is in the ON state, the control circuit 30 removes the covering image 52 displayed on each overhanging portion 51 from each overhanging portion 51. Is output from the determination unit 45 to the optotype presenting apparatus 13 via the image output unit 31. Thereby, as shown in FIG. 13, the covering image 52 is removed from each overhanging portion 51. In a state where the covering image 52 is removed from each overhanging part 51, light transmission to each overhanging part 51 is allowed.

  Thereby, when the glare test is executed, the covering image 52 is removed from each overhanging portion 51, so that each of the overhanging portions 51 is emitted from each illumination light source 17 and does not pass through the light guide plate 18. Incident light passes through each overhang 51 from the back side to the front side.

  A part of the light emitted from each illumination light source 17 is reflected by each extending portion 20a of the reflection sheet 20, and then passes through each projecting portion 51 from the back side to the surface side.

  Since the luminance of the light emitted to the surface side of each overhanging portion 51 is higher than the luminance of the light emitted through the light guide plate 18 and the liquid crystal display plate 16, the luminance is higher than the luminance of the liquid crystal display plate 16. Glare light can be generated.

  Therefore, by irradiating the eye to be inspected with the light emitted through each overhanging portion 51, the eye to be inspected can be placed under a situation in which dazzling light is irradiated.

  In the example shown in FIGS. 1 to 13, when performing the glare test, the luminance of each illumination light source 17 can be automatically maximized.

  In this case, when the determination unit 45 determines that the glare test switch 37 is in the ON state, the control circuit 30 determines the luminance level of each illumination light source 17 based on the operation position signal received from the luminance adjustment switch 54. The determination unit 45 determines whether the indicated numerical value N1 is lower than “10”.

  When the determination unit 45 determines that the numerical value N1 of the luminance level is lower than “10”, the control circuit 30 determines the value of the voltage applied to each illumination light source 17 for each withstand voltage of each illumination light source 17. A control signal for increasing the value is output from the determination unit 45 to the optotype presenting apparatus 13.

  When the optotype presenting apparatus 13 receives the control signal from the control circuit 30, it drives the drive unit (not shown) provided in the optotype presenting apparatus 13 to change the value of the applied voltage to each illumination light source 17 with the withstand voltage. Increase to value. Thereby, each light source 17 for illumination emits light with each maximum brightness | luminance.

  As a result, when the test image 48 is displayed on the liquid crystal display panel 16 during the glare test, the brightness of the glare light emitted from each window 50 formed in the test image 48 can be increased. When the above-described protruding portion 51 is formed on the liquid crystal display panel 16, the brightness of the glare light emitted from the protruding portion can be increased.

  Accordingly, when the glare light is irradiated on the eye to be examined, the eye to be examined can be placed in a situation that is closer to the situation in which the dazzling light from the headlight of the oncoming vehicle is illuminated on the eyes when driving the vehicle at night.

  Further, when the voltage applied to each illumination light source 17 is increased, the power consumption is not increased as much as when the conventional dedicated glare light source is turned on separately from the illumination light source during the glare test. .

  Further, in the example shown in FIGS. 1 to 13, an example in which the visual acuity test target 12 a is configured by the Landolt ring 12 b including the letter “C”, but instead, for example, includes the letter “E”. The visual acuity test target, and the visual acuity test target composed of characters and symbols such as hiragana characters and katakana characters can be applied to the present invention.

  Further, in the examples shown in FIGS. 1 to 13, an example in which the test image 48 and the cover image 52 are each black is shown. However, the liquid crystal when illuminated by each illumination light source 17 in a non-display state is shown. Any color other than black can be added to the test image 48 if the color is lighter than the color of the display panel 16, and any color other than black can be used as long as it prevents the illumination light source 17 from transmitting light. Can be added to the covering image 52.

  In the present embodiment, an example in which the present invention is applied to the subjective optometry apparatus 10 has been described. Instead, the visual function of the eye to be examined is measured by presenting the target 12 to the subject 11. Therefore, the present invention can be applied to optometry apparatuses other than the subjective optometry apparatus 10.

1 is a perspective view schematically showing an optometry apparatus according to the present invention. It is a cross-sectional view schematically showing the optotype presenting apparatus according to the present invention. 1 is a perspective view schematically showing a controller according to the present invention. 1 is a block diagram schematically showing an optometry apparatus according to the present invention. It is explanatory drawing which shows roughly the visual target for a visual acuity test which concerns on this invention. It is a front view which shows roughly the display screen of the display part which concerns on this invention. It is a front view which shows roughly the state by which the image for a test was displayed on the liquid crystal display panel which concerns on this invention. It is a flowchart which shows the control effect | action by a control circuit when measuring the visual acuity value of the eye to be examined. It is a front view which shows roughly the state by which the Landolt ring of the color selected by operation of the contrast change switch which concerns on this invention was displayed on the liquid crystal display part. 1 is a front view schematically showing a state in which a test image according to the present invention is displayed on a liquid crystal display panel and a Landolt ring of a color selected by operating a contrast change switch is displayed on the liquid crystal display panel on the test image. It is. It is a front view which shows roughly the state by which the image for a test in which the display window was formed was displayed on the liquid crystal display panel. (A) is a cross-sectional view schematically showing an optotype presenting apparatus including a liquid crystal display panel on which an overhang portion is formed, and (b) schematically shows a state in which a covering image is displayed on each overhang portion. FIG. It is a front view which shows roughly the state from which the covering image was removed from each overhang part which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optometrist device 12 Visual target 13 Display device (visual target presenting device)
16 Liquid crystal display board 17 Light source for illumination 18 Light guide plate 30 Control part (control circuit)
32 Memory part 33 Target data 47 Glare light generation means 48 Test image 49 Test image data 51 Overhang part 52 Cover image

Claims (4)

  A liquid crystal display panel on which various targets presented to the eye to be examined are displayed, a display device having an illumination light source for illuminating the liquid crystal display panel, and a contrast ratio with respect to the liquid crystal display panel illuminated by the illumination light source A memory unit that stores a plurality of target data indicating the target with different colors, a control unit that controls the operation of the display device, and the liquid crystal display that emits light from the illumination light source Glare light generating means for generating glare light having a brightness higher than the brightness of the plate using the illumination light source, and the control unit is under a situation where the contrast between the surroundings and the object to be viewed is low. When receiving an instruction to perform a contrast test for inspecting the visual function of the eye to be examined, the target data colored with a color corresponding to the contrast ratio indicated in the instruction content is stored in the memo. And a control signal for displaying the target indicated by the extracted target data on the liquid crystal display panel is output to the display device, and the dazzling light is irradiated on the eye to be examined. When receiving an instruction to perform a glare test for examining the visual function of the eye to be examined, the optometry apparatus generates the glare light using the glare light generating means.   The glare light generating means is displayed on the liquid crystal display plate so as to cover the entire surface of the liquid crystal display plate, and is more than the color of the liquid crystal display plate when illuminated by the illumination light source in a non-display state. A test image having a low-lightness color and having a window portion that allows light transmission of the liquid crystal display panel that emits light from the illumination light source, and the test image data indicating the test image is stored in the memory And when the control unit receives an instruction to perform the glare test, the control unit extracts the test image data from the memory unit, and the test image indicated in the test image data 2. The optometry apparatus according to claim 1, wherein a control signal is output to the display device to display the target on the liquid crystal display panel and to display the target on the test image.   A light guide plate is disposed on the back side of the liquid crystal display plate so as to overlap the liquid crystal display plate, and at least one of the edges of the light guide plate is in the vicinity of the edge. A plurality of illumination light sources including the illumination light source are arranged along the edge to allow light to enter from the edge, and the edge of the light guide plate among the edges of the liquid crystal display panel Is formed so as to cover the respective illumination light sources, and the glare light generating means attaches the overhang to the overhang. A covering image that is displayed so as to cover the entire surface and has a color that prevents transmission of light from each of the illumination light sources; covering image data indicating the covering image is stored in the memory unit; and the control unit The coverage image when the glare test is not performed Data is extracted from the memory unit, the covering image is displayed on the overhanging portion, and upon receiving an instruction to perform the glare test, a control signal for removing the covering image from the overhanging portion is received. The optometry apparatus according to claim 1, wherein the optometry apparatus outputs to the display device.   The said control part controls the action | operation of the said light source for illumination so that the light quantity of the said light source for illumination may be maximized when the instruction | indication which performs the said glare test is received. The optometry apparatus according to claim 1.

Images