JP2004167230A - Visual acuity testing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to recognize one's potency of visual acuity to the change in visual environment. <P>SOLUTION: The subject visual acuity testing apparatus for testing the visual acuity of an eye to be examined by presenting a visual acuity examination target to the eye to be examined is provided with a means for changing the visual environment for presenting the target according to the contrast change of the target and the presence of projected light such as glare light; an evaluation means for computing the difference between the visual acuity results, examined by presenting the target in different visual environment conditions, and computing the evaluation results classified stepwise based on the difference; and an output means for outputting the evaluated results. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a visual acuity test apparatus that can be suitably used for driving aptitude test and the like.

In a driving aptitude test of a car, in addition to a normal static visual acuity test, a moving body visual acuity test is performed in order to test the degree of visibility of a moving object when driving a car (see Patent Document 1).
JP-A-2000-201893

  Incidentally, the appearance of the vehicle during driving is affected by the glare (glare light) caused by the headlight of the oncoming vehicle at dusk or at night, and also by the degree of contrast between the surrounding background and the object. For this reason, in addition to the usual static visual acuity test, dynamic visual acuity, visual acuity when glare light is projected, visual acuity when the contrast is changed, and when the subject is changed to a different visual environment than normal It is important to make people aware of their ability to see and give appropriate driving guidance.

  When such a glare test or contrast test is performed in addition to a normal still visual acuity test and a dynamic visual acuity test, separate inspection devices require a long time for the test, and the subject's concentration is interrupted. Since there is a problem affecting accuracy, a device that can be continuously manufactured is desired. Further, in the conventional apparatus, there is a problem that it is difficult to make a state close to a change in an actual visual environment.

  The present invention has been made in view of the above-described conventional technology, and allows the user to recognize his or her visual acuity with respect to a change in the visual environment in an easy-to-understand manner, and efficiently performs a visual acuity test in a state close to the actual change in the visual environment. It is an object of the present invention to provide a visual acuity inspection apparatus that can perform the above.

In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) In a visual acuity inspection apparatus that presents a visual acuity test target to an eye to be inspected and tests the visual acuity of the eye to be inspected, a visual environment variable unit that changes the visual environment that presents the visual target to the eye to be inspected; An evaluation means for calculating a difference between visual acuity results inspected by the optotype presentation, calculating an evaluation result classified stepwise based on the difference, and an output means for outputting the evaluation result, I do.
(2) In the visual acuity test apparatus of (1), the visual environment changing means is means for changing the contrast of the presented target by the target presenting means.
(3) The visual acuity inspection apparatus of (1), further comprising glare light projecting means for projecting glare light toward the eye to be inspected, wherein the visual environment changing means is means for changing the light projection state of the glare light. There is a feature.
(4) In a visual acuity test apparatus that presents a visual acuity test optotype to an eye to be inspected and tests the visual acuity of the eye to be inspected, a background luminance variable unit that changes the background luminance of the optotype and a transmittance of the optotype are changed. And a target transmittance changing unit.
(5) A visual acuity inspection apparatus for inspecting visual acuity of an eye to be inspected, comprising: an optotype presenting means capable of changing an optical distance of an inspection optotype to be presented to the eye to be inspected; In the visual acuity inspection apparatus capable of examining the static visual acuity of the eye to be examined by presenting at the optical distance of the eye and changing the optical distance of the eye to be inspected at a predetermined speed, the visual acuity of the eye to be inspected is glare A glare light projecting means for projecting light is provided, and glare light is projected when the optotype presenting means presents an inspection target, thereby enabling glare inspection.
(6) In the visual acuity inspection apparatus of (5), the optotype presenting means has a light splitting optical system for splitting the optotype light beam into optical paths for the left and right eyes, and the glare projecting means is split by the light splitting optical system. Are provided in the left and right optical paths respectively.
(7) In the glare projecting means of (6), half mirrors are respectively arranged on the left and right optical paths split by the light splitting optical system, and the glare light is projected to the left and right eyes through the half mirrors. It is characterized in that the configuration is such that:
(8) In the visual acuity inspection apparatus according to (5), the glare projecting unit is disposed between a light source that emits glare light and the light source and the eye to be inspected, and the light source is separated from the eye to be inspected by more than an actual distance. And a projection lens for making it appear as if the image is projected from a different position.
(9) In the visual acuity inspection apparatus of (8), the projection lens is also used as a target projection lens of the target presentation means.
(10) The visual acuity test apparatus according to (8) or (9) has left and right test windows through which the left and right subject's eyes respectively look into a test target presented in the apparatus. It is characterized by being arranged near the left and right inspection windows, respectively.

  The user can recognize his or her visual ability with respect to a change in the visual environment by an easy-to-understand method. Further, a plurality of visual acuity tests in which the visual environment is changed can be performed efficiently and continuously. Further, it is possible to realize a visual acuity inspection apparatus that can simplify the apparatus configuration and reduce costs.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a visual acuity inspection apparatus according to the present invention.

  Reference numeral 1 denotes an apparatus main body, and reference numerals 2R and 2L denote inspection windows for a subject to look into the apparatus and observe an inspection target presented in a housing by an optical system described later. An operation panel 3 having various switches for the examiner to operate is arranged on a side surface of the apparatus main body 1.

  An operation unit operated by a subject is provided integrally with the housing of the apparatus main body 1 on the front side of the lower part of the apparatus main body 1. Reference numeral 5 denotes a joystick for allowing the subject to input a direction of a break of the Landolt ring target to be presented, and reference numeral 4 denotes a response button for inputting a response when the presented target cannot be determined. The response button 4 also serves as a response input when a test target presented at the time of the dynamic visual acuity test can be determined. Reference numeral 6 denotes a switch for starting an inspection in the automatic inspection mode. 9 is a speaker 9 for outputting a voice guide.

  Reference numeral 8 denotes a printer that prints out the inspection results. Reference numeral 10 denotes an opening / closing door, inside which are provided a speed changeover switch for changing the apparent speed of the target moving at the time of moving object visual acuity inspection, a switch for setting the contrast at the time of the contrast inspection and the illumination brightness of the target, and the like. Is built-in. The moving speed of the optotype at the time of the dynamic visual acuity test can be changed every 20 km / h between 20 km / h and 60 km / h. Normally, it is set to the reference speed of 30 km / h.

  FIG. 2 is a diagram viewed from the side of the optical system of the apparatus and a main part configuration diagram of a control system. FIG. 3 is a diagram of the optical system viewed from above. 11 is an illumination light source, 12 is a condenser lens, and 13 is a target plate. As shown in FIG. 4, the optotype plates 13 are provided with optotypes 40, 41, and 42 having different contrast ratios with respect to the background luminance. The optotype 40 has a contrast ratio of 100% (transmittance of optotype 0%), the optotype 41 has a contrast ratio of 10% (transmittance of optotype 90%), and the optotype 42 has a contrast ratio of 50%. % (Transmittance of the target is 50%). The optotypes 40, 41, and 42 are four Landolt ring optotypes each having a cut in the vertical and horizontal directions, and have the same size. Further, as the illumination light source 11 in the present apparatus, a white LED whose light amount (luminance) can be changed is used, and the background luminance of the optotype can be changed. The optotype plate 13 is rotated by the motor 31, and the presented optotype is switched.

  The optotype on the optotype plate 13 is illuminated by turning on the illumination light source 11, and the optotype light flux from the optotype plate 13 is reflected by the prism 14 and the mirror 15, passes through the lens 16, and then is reflected by the mirror 17. Head to lens 18. The optotype light flux that has passed through the lens 18 is incident on a prism 19, and is split by the prism 19 into left and right optical paths. A mirror 20R and a mirror 20L are disposed on each of the divided optical paths, and the optotype luminous flux reflected by the mirrors 20R and 20L passes through the protective glasses 22R and 22L disposed on the inspection window 2 to be covered. Head to the left and right of the optometry respectively. Half mirrors 21R and 21L are arranged in front of the left and right eyes via protective glasses 22R and 22L, respectively. The glare emitted from the glare light source 25 is reflected by the half mirrors 21R and 21L, respectively, and directed to the subject's eye. The two glare light sources 25 are provided so as to sandwich the optical axis in the left and right optical paths, respectively. Note that the glare light source 25 may be arranged around the left and right inspection windows 2R, 2L (protective glasses 22R, 22L), respectively, to directly irradiate the eye to be inspected with glare light.

  The prism 14 is moved by the moving device 32 and can optically change the distance between the eye to be examined and the target from 50 m to 3 m. The size of the optotype on the optotype plate 13 is a visual acuity value of 1.66 when the distance between the subject's eye and the optotype is 50 m, a visual acuity value of 1.0 when the distance is 30 m, and a visual acuity value of 0. 0 when the distance is 3 m. It is designed to be 1. When performing the one-eye inspection, shutters (not shown) are inserted into the optical paths before the left and right protective glasses 22R and 22L.

  Reference numeral 30 denotes a control unit. The control unit 30 stores a test program such as a normal still visual acuity test, a dynamic visual acuity test, a contrast test, a glare test, and the like, and turns on and off the illumination light source 11 and the glare light source 22 and a motor 31, The operation of the moving device 32 and the voice guide generator 33 is controlled. In addition, the control unit 30 is connected to the panel unit 3, the response button 4, the joystick 5, a memory 34 for storing measurement results, etc., the printer 8, and an input device 35 for inputting an age. The input device 35 includes a numeric keypad 35a for inputting the age as a numerical value, and a display unit 35b for displaying the age.

  FIG. 5 is a configuration diagram of the operation panel 3. 100 is an inspection mode selection switch. The examination mode includes an automatic examination mode in which the examinee can proceed with the examination by performing a switch operation by himself / herself in accordance with the voice guide, a manual examination mode in which the examiner conducts the examination with each switch operation, and instructions for examination procedures. Conditions are set by the apparatus, and there are three types of semi-automatic examination modes in which the examination is advanced by the examiner inputting only the response of the examinee.

  Reference numeral 101 denotes a switch for selecting an eye (left, right, both eyes) to be inspected. Reference numeral 102 denotes a switch for starting a static visual acuity test at normal brightness, 103 a switch for starting a dynamic visual acuity test, 104 a switch for starting a contrast test, and 105 a switch for starting a glare test. The switches 102 to 105 are used when performing an individual inspection in the manual mode.

  Reference numeral 110 denotes a display for displaying a visual acuity value, and 111 denotes a switch for selecting a visual acuity value. Reference numeral 115 denotes a target switch unit, which is provided with four switches for inputting the direction of the cut of the Landolt ring target in four directions, up, down, left, and right. Reference numeral 106 denotes a switch used by the examiner to input a message indicating that reading is impossible. Reference numeral 38 denotes a print switch for printing out the inspection result.

  Next, a description will be given of a static visual acuity test, a dynamic visual acuity test, a contrast test, and a glare test, which are ordinary visual acuity tests, performed by the apparatus having the above configuration. Here, a case will be described in which each inspection is continuously performed by using the automatic inspection mode.

  When the switch 6 is pressed, first, a normal still vision test is started. Under the control of the control unit 30, one of the optotypes 40 (high-contrast optotype) of the optotype plate 13 is arranged in the optotype presenting optical path, and the illumination light source 11 is turned on. The background luminance of the optotype is set to 200 cd / cm 2. The movement of the prism 14 adjusts the optical target presentation distance so that the visual acuity value of the first target becomes 0.5. The subject responds with the joystick 5 on the result of discrimination of the target. If the target cannot be determined, a response is made with the button 4. The control unit 30 determines whether the direction in which the joystick 5 is tilted with respect to the presentation target is correct. If the answer is correct, the prism 14 is moved to increase the visual acuity value by one level (to a visual acuity value of 0.6). If the response is an incorrect answer (including a response indicating that it cannot be determined), the visual acuity value is lowered by one level (to a visual acuity value of 0.4). If there is an incorrect answer at the stage of increasing the visual acuity value, the visual acuity value of the visual target is returned to the visible stage, and the direction of the visual target is changed. If there are two or more correct answers with the same visual acuity value, the control unit 30 assumes that the visual acuity value is present. The static visual acuity value is stored in the memory 34.

  Then, it moves to a dynamic visual acuity test. The control unit 30 moves the prism 14 to set the optical presenting distance of the target (the target 40) at 50 m (the visual acuity value of 1.6), and then applies an apparent speed of 30 Km / h to the subject's eye. Move toward it. The direction of the cut in the optotype is randomly determined. The subject presses the response button 4 when the target can be read. The control unit 30 stops the movement of the optotype and simultaneously turns off the illumination light source 11 to make the optotype invisible. The subject responds to the cut direction of the optotype by operating the joystick 5. The control unit 30 determines whether the joystick 5 is correct or not based on a response input from the joystick 5. The moving object visual acuity value is calculated based on the position of the target when the response button 4 responds. The dynamic visual acuity test is repeated until a correct answer is obtained five times.

  Then, it moves on to a contrast test. The target used in the contrast test can be selected in advance by a switch inside the opening and closing door 10. Here, it is assumed that the low contrast optotype 41 is set. The background luminance of the optotype is set to 200 cd / cm 2, as in a normal still vision test. The control unit 30 drives the motor 31 to arrange one of the low-contrast optotypes 41 in the optotype presenting optical path. The presentation of the low-contrast optotype 41 starts the visual acuity test in the same manner as the static visual acuity test. First, after moving the prism 14 so that the visual acuity value of the target becomes 0.5, the subject is asked by the joystick 5 or the button 4 to respond that the determination result cannot be read. The control unit 30 changes the visual acuity value of the target based on the correctness of the response. If there are two or more correct answers with the same visual acuity value, it is assumed that the visual acuity value is present. The low contrast visual acuity value is stored in the memory 34.

Next, it moves on to glare inspection. In the glare test, under the control of the control unit 30, any one of the optotypes 40 is arranged again in the optotype presenting optical path, and the glare light source 25 is turned on. Under the lighting of the glare light source 25, the control unit 30 determines whether the response content of the subject is correct or not, and examines the visual acuity value, similarly to the above-described normal still visual acuity test.
When the inspection is completed up to the glare inspection, a voice guide announces the end of the inspection, and the printer 8 outputs the inspection result.

  FIG. 6 is a view showing an example of a printout of the inspection result. In the test result column, a normal still visual acuity result 201, a dynamic visual acuity test result 202, a contrast test (a visual acuity value in a 10% low contrast test) 203, a glare test result 204, The guidance content 205 is displayed. Below the contrast test result 203, an evaluation 210 for the contrast test is displayed. In the evaluation 210, a difference between the visual acuity value obtained by the still visual acuity test and the visual acuity value obtained by the contrast test is calculated by the control unit 30, and the evaluation is classified into five stages based on the difference. For example, as shown in FIG. 7, the visual evaluation of the difference is “evaluated in order” according to “0.1 or less”, “0.2”, “0.3”, “0.4”, and “0.5 or more”. 5 (excellent) "," evaluation 4 (somewhat excellent) "," evaluation 3 (normal) "," evaluation 2 (somewhat inferior) "," evaluation 1 (inferior) ", etc. The control unit 30 determines five relative evaluation values for the static visual acuity.

  Also, below the glare test result 204, a glare test evaluation 212 classified into five stages based on the difference between the visual acuity value obtained by the static visual acuity test and the visual acuity value obtained by the glare test is displayed. Have been. This evaluation 212 is also determined in accordance with the table in FIG. 7, similarly to the method of calculating the evaluation 210 of the contrast test. As for the moving object visual acuity, an evaluation classified into five levels based on the difference between the static visual acuity and the visual acuity value may be displayed. Since the change in the visual acuity value when the visual environment changes is represented in an easy-to-understand form, even an elderly subject can easily recognize the degree of his or her visual ability. The guidance content 205 displays precautions for a change in the visual environment during driving of the vehicle, based on the evaluation and the visual acuity value of each test.

The classification of the evaluation based on the difference with respect to the static visual acuity of each test may be determined by statistically processing the results of testing a large number of subjects. In addition, since the ability of the appearance changes with the age, the evaluation may be calculated by performing statistical processing for each age. The age of the subject is input by the input device 35 before starting the examination. The evaluation results are classified into five levels for the same age group. For example, if the subject is in the age group of 50 to 59 years, the evaluation result is expressed as higher / lower than the average of 50 to 59 years.
Further, in the dynamic visual acuity test, the contrast test, and the glare test, the visual ability may be classified into five levels based on the results of the respective visual acuity tests and may be evaluated.

In the contrast test and the glare test in the above embodiment, the background luminance of the optotype is the same as that of a normal still vision test. However, by adjusting the amount of light of the illumination light source 11, for example, 10 cd / cm ² is hardly visible at night or the like. By changing the visual environment to reproduce the visual acuity, it is possible to more appropriately inspect the visual ability at the time of driving. Furthermore, when the optotype 42 having a contrast ratio of 50% is used instead of the low-contrast optotype 41, the visual environment when viewing an object having low contrast at night or the like can be easily reproduced.
In addition, in the presentation of the optotypes in different contrast states, only the background luminance of the optotype may be changed by adjusting the light amount of the illumination light source 11 (contrast inspection includes this case).
The projection of the glare light and the change of the contrast of the presented target may be performed at the time of the moving subject visual acuity test. In the driving aptitude test, by performing a visual acuity test in various changing states of the visual environment, it is possible to provide guidance and advice on a more appropriate driving method of the vehicle.

  In the above embodiment, the glare light is simply inserted into the optical path of the test target, but is not limited to this. It is also possible to adopt a configuration in which the glare light source is projected to the eye to be examined from a distance farther than the actual distance.

  FIG. 8 is a view for explaining an optical system configured to project a glare light source from a position distant by a predetermined distance (here, approximately 30 m in this case) from the eye to be examined (similar to FIG. 3, the optical system is viewed from above). (See figure). In the drawing, components having the same functions as the members shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. The other optical members and the configuration of the control system are basically the same as those shown in FIG.

  Reference numerals 50R and 50L denote glare light sources, as shown in FIG. 8, which are arranged at positions that are not optically affected by the prism 14 shown in FIG. Although the glare light sources 50R and 50L can be installed near the optotype plate 13, if the glare light source is installed near the optotype plate 13, the glare light source is moved by the movement of the prism 14 during moving object inspection. However, since the eye approaches the eye to be examined together with the optotype, it is difficult to perform an accurate glare inspection. Therefore, it is preferable that the glare light sources 50R and 50L are arranged at positions where they are not optically affected by the prism 14 as described above.

  Reference numerals 51R and 51L denote mirrors for returning the light beams from the glare light sources 50R and 50L, respectively, and making the light beams enter the prism 19. The mirror 51R and the mirror 51L are disposed so as to sandwich the optotype light flux toward the prism 19 after being reflected by the mirror 17 from both sides. The installation interval between the mirror 51R and the mirror 51L has an interval that allows all the target light beams reflected by the mirror 17 to pass and does not block the target light beams. In addition, after the light beams emitted from the glare light sources 50R and 50L are reflected by the mirrors 51R and 51L, the glare light sources 50R and 50L are installed with respect to the mirrors 51R and 51L so that as much illumination light as possible enters the prism 19. The angle has been adjusted.

  Reference numerals 52R and 52L denote lenses for projecting the test target to the left and right eyes to be examined instead of the lens 18 of FIGS. 2 and 3, respectively. The mirrors 20 and 20L and the protective glasses 22R and 22L. At the same time, the lenses 52R and 52L also serve as projection lenses for projecting the glare light sources 50R and 50L to the eye to be inspected. The installation positions of the glare light sources 50R and 50L are located closer to the subject's eye than the focal positions of the lenses 52R and 52L. As a result, the glare light source 50R and the glare light source 50L apparently appear to be projecting from the position farther than the actual distance to the subject's eye. In the present embodiment, the apparent projection distance is set to 30 m. However, the present invention is not limited to this. The projection distance of the glare light source (50R, 50L) necessary for more accurate glare inspection is set to infinity. Any optical design can be used as long as a distance (for example, 5 m to 50 m or the like) that can be considered to be considered.

  Further, since the glare light sources 50R and 50L are located at positions deviated from the optical axis of the target light beam as shown in the figure, the farther the lenses 52R and 52L are from the eye, the more glare light incident on the eye becomes. The shift amount of the light beam (the shift amount of the target light beam from the optical axis) becomes large. As a result, the glare light projected on the eye to be examined is blurred by an optical member in the middle and the outer walls around the protective glasses 22R and 22L, and the displacement of the light flux reduces the beam diameter of the glare light incident on the eye to be examined. Or it may be completely invisible. For this reason, the lenses 52R and 52L for projecting the glare light sources 50R and 50L to the eye to be inspected are located as close to the eye as possible, in other words, as much as possible in the inspection windows 2R and 2L where the protective glasses 22R and 22L are located. It is preferable to arrange them so as to be close to each other.

  A glare inspection in an apparatus having the above-described optical system configuration will be described. Under the control of the control unit 30 shown in FIG. 2, any one of the targets 40 is arranged in the target presenting optical path, and the glare light sources 50R and 50L are turned on. The glare light beams emitted from the glare light sources 50R and 50L are reflected by the mirrors 51R and 51L, respectively, and enter the prism 19 together with the target light beams. Thereafter, the target beam and the glare beam are split into left and right optical paths, and travel toward mirrors 20R and 20, lenses 52R and 52L, and protective glasses 22R and 22L, respectively, to the left and right eyes. The subject can perform the inspection while looking at the glare light source projected from both sides of the optotype image presented at the predetermined distance apparently 30 m from the front, so that a state more suited to the actual situation can be obtained. It is possible to perform glare inspection with high reliability. The same applies to a one-eye examination.

  In the optical system shown in FIG. 8, the lenses 52R and 52L disposed in the vicinity of the protective glasses 22R and 22L are shared for both the presentation of the optotype and the projection of the glare light source. Not something. Although the beam diameter of the glare light entering the eye to be examined becomes slightly smaller, it is also possible to arrange a projection lens between the glare light source 25 and the half mirror 21R (21L) shown in FIG. 2, for example.

1 is an external view of a visual acuity inspection apparatus according to the present invention. FIG. 2 is a diagram of an optical system of the apparatus as viewed from a side, and a main part configuration diagram of a control system. It is the figure which looked at the optical system from the top. FIG. 3 is a diagram illustrating a configuration of a target formed with a target plate. FIG. 3 is a configuration diagram of an operation panel. It is a figure of the example of a print output of an inspection result. It is a figure which shows the evaluation of five steps based on the difference of a visual acuity value. FIG. 3 is a diagram showing an optical system for making a glare light source look as if projected from a distance.

Explanation of reference numerals

8 Printer 11 Illumination light source 13 Optotype plate 40, 41, 42 Optotype 14 Prism 19 Prism 21R, 21L Half mirror 25 Glare light source 30 Control unit 31 Motor 32 Moving device 40, 41, 42 Optotype 203, 212 Evaluation

Claims (10)

In a visual acuity test apparatus that presents a visual acuity test optotype to the eye to be inspected and tests the visual acuity of the eye to be inspected, a visual environment variable means for changing the visual environment to present the optotype to the eye to be inspected, and a visual target presentation in a different visual environment state A visual acuity test, comprising: an evaluation unit that calculates a difference between the visual acuity results inspected by the method and calculates an evaluation result classified stepwise based on the difference; and an output unit that outputs the evaluation result. apparatus. 2. The visual acuity test apparatus according to claim 1, wherein said visual environment changing means is means for changing a contrast of a visual target presented by said visual target presenting means. 2. The visual acuity testing apparatus according to claim 1, further comprising: glare light projecting means for projecting glare light toward the eye to be inspected, wherein the visual environment changing means is means for changing a light projection state of the glare light. Characteristic visual acuity inspection device. In a visual acuity inspection apparatus that presents a visual acuity test target to an eye to be inspected and tests the visual acuity of the eye to be inspected, a background luminance variable unit that changes the background luminance of the target, and a target transmission that changes the transmittance of the target. A visual acuity testing apparatus, comprising: a rate varying unit. A visual acuity inspection apparatus for inspecting visual acuity of a subject's eye, comprising: a target presenting means capable of changing an optical distance of a test target presented to the subject's eye; In the visual acuity inspection apparatus capable of inspecting the dynamic visual acuity of the eye by changing the optical distance of the eye to be inspected at a predetermined speed, the glare light is projected on the eye to be inspected. A visual acuity inspection apparatus, comprising: a glare projecting unit that emits light; and a glare test is enabled by projecting glare light when the test target is presented by the target presenting unit. 6. The visual acuity test apparatus according to claim 5, wherein the optotype presenting means has a light splitting optical system for splitting the optotype light beam into optical paths for the right and left eyes, and the glare light projecting means has a left and right light split by the light splitting optical system. A visual acuity testing device provided in each of the optical paths. The glare projecting means according to claim 6, wherein a half mirror is arranged on each of the left and right optical paths split by the light splitting optical system, and the glare light is projected on the left and right eyes through the half mirror. A visual acuity testing device characterized by the following. 6. The visual acuity inspection apparatus according to claim 5, wherein the glare projecting unit is disposed between a light source that emits glare light and the light source and the eye to be inspected, and the light source is positioned away from an actual distance from the eye to be inspected. A visual acuity inspection apparatus, comprising: a projection lens for making it appear as if it is being projected. 9. The visual acuity test apparatus according to claim 8, wherein the projection lens is also used as a target projecting lens of the visual target presenting means. The visual acuity test apparatus according to claim 8 or 9, wherein the left and right subject's eyes have left and right test windows for looking into a test target presented in the device, respectively, and the projection lens is provided with the left and right test windows. A visual acuity testing device, wherein the visual acuity testing devices are arranged in the vicinity of each other.

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