JP3406922B2 - Eyesight device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for measuring visual acuity.
Eyesight device. 2. Description of the Related Art In a conventional visual acuity device, various fixing methods are used.
Depending on the liquid crystal provided with the optotype mark pattern,
Is known to display eyesight marks and measure eyesight
I have. [0003] However, the above-mentioned
In the conventional example, the types of optotypes with fixed patterns are limited.
Is determined. In addition, the presented position is fixed for each optotype mark
There are drawbacks. In addition, extremely small optotype marks
The problem that the accommodation state of the eyes is not stable when displayed
There is. An object of the present invention is to solve the above-mentioned problems,
The target mark is displayed using the electronic figure display means,
It is an object of the present invention to provide a visual acuity device capable of performing good visual acuity measurement. [0005] To achieve the above object,
The visual acuity device according to the present invention comprises a matrix of pixels.
Stripes with different pitches and moving directions
Is displayed, and the visual direction is determined by
It is characterized by measuring. [0008] In the visual acuity apparatus having the above-described structure, an electronic figure table is provided.
The stripes having different pitches and moving directions are displayed on the indicating means. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
I do. FIG. 1 is a sectional view of the first embodiment. Case 1 positive
In the upper part of the screen, distant presentation is provided during myopia / amblyopia training.
For left and right eyes adjusted to provide near viewing during visual training
The two eyepieces 2 are provided.
Visual acuity chart composed of liquid crystal, LED, etc. as shown in 2
An indicator 3 is provided. This display unit 3 has 4
Sight marks 4 of various sizes are randomly displayed in the direction
A visual acuity mark display section 5 is provided at the center,
Displays the visual acuity indicated by the optotype mark 4 currently displayed beside
A visual acuity value display unit 6 is provided. The visual acuity target
The display unit 3 is rotated from behind by a backlight (not shown).
It is illuminated with the side view. The target mark display unit 5 and the visual acuity value display unit 6
Both are connected to the control means 7 and further provided inside the housing 1.
Speaker 8 and a joy provided on the side of housing 1
A stick 9 is connected to the control means 7. The trainee looks into the eyepiece lens 2 and
If the practitioner is myopic or amblyopic, it will be seen in the distance,
In this case, the target mark 4 that is visually recognized in the near direction is stared. Next
Therefore, the trainee judges the direction of the target mark 4 and
Input using the stick 9. The input signal is supplied to the control means 7
Is transmitted to the speaker 8 if the input is correct.
Generate a sound, and if it is a wrong answer, generate a wrong answer and
The correctness of the input can be notified to the expert. The correct answer is
If it has continued twice, the control means 7 moves the optotype mark 4 one step down.
And replace it with a smaller one, and display the target mark display section 5
To correct. Conversely, if the wrong answer continues twice,
The control means 7 replaces the optotype mark 4 with a larger one.
Then, the target mark display section 5 is corrected. In this embodiment, the method of transmitting a true / false message by voice is described.
Although the formula is adopted, it can be visually recognized with a lamp etc.
A configuration that can be used may be adopted. In addition, the visual acuity value display unit 6 is the housing 1
And may not be provided within the line of sight. Furthermore, positive
Incorrect answer is not displayed, and if the answer is correct, the next target mark 4
Is displayed, and in the case of an incorrect answer, the same target mark 4 is again displayed.
It may be configured to display and prompt a response. In this case,
Since the mark 4 does not change, the response is incorrect.
Will be notified. The indication mark 4 is randomly displayed.
Remembered by the trainee because the order is not fixed
Never. The target mark 4 is repeatedly presented and trained
Is performed, but since the direction of the optotype mark 4 always changes,
Never get tired. FIG. 3 is a block diagram of the second embodiment. Video
The display unit 10 is made of a CRT, a liquid crystal, or the like, and is presented to an operator.
The target mark 11 and the visual acuity value 12 representing its size are displayed.
At a distance of several meters from the operator, or
Is located on the side. Optotype mark 1 on video display unit 10
Joy for the operator to determine the direction of 1 and input by himself
Response means 13 such as scutik, and overall control of these
The control means 14 is connected to the control means. At the time of training, an operator who receives visual training
Actually observes the image display unit 10 from a distance optically.
You. Provided inside the control means 14 on the video display unit 10
The target generated by the symbol generation circuit (not shown)
The mark 11 follows the built-in program in the control means 14.
Is displayed. The operator determines the direction of the optotype mark 11.
Then, the response means 13 is defeated and input is performed. According to this input
The control means 14 controls the target mark according to the built-in program.
11 are generated sequentially, and the visual
The force value 12 is displayed on the video display unit 10. FIG. 4 is an explanatory diagram showing an example of the training procedure.
First, in step 1, as shown in FIG.
A rightward optotype mark 11 showing a large visual acuity of 0.1
It is displayed on the display unit 10. If there is a correct response,
The display unit 10 switches, and the visual acuity value shown in FIG. 5 (b) is displayed.
Then, proceed to the next step 2. In step 2, the visual acuity value
The optotype mark 11 corresponding to 0.2 is displayed and the trainee
Is newly input by the response means 13 and the training is continued.
You. At first, it goes back and forth with about 0.5 eyesight
By the way, the target mark 11 smaller than that
It is becoming. In addition, R, L, U, and D in FIG.
Indicates the direction of the mark 11 and indicates the right, left, top, and bottom, respectively.
And the following numbers represent visual acuity. In this case, the grade is displayed each time a response is made.
To make efforts to relieve the regulatory function by
This means that biofeedback has been applied. Sight
The presentation method of the mark 11 changes randomly each time.
Continue training without getting tired of playing games without repetition.
Can be. In addition, the means for displaying the results is the target mark 1
1 is preferably displayed together with the video display unit 10 for displaying
However, it may be provided separately near the input response means 13.
In addition, the result display may be a figure instead of a numerical value. In FIG. 5, the target mark 11 and the visual
The force value 12 is displayed alternately, but this is the target mark
11 and the visual acuity value 12 are large,
Is not displayed on the target mark
When the size of the lock 11 is small, as shown in FIG.
Is desirably displayed. FIG. 6 shows an automatic optometer in the third embodiment.
FIG. 2 is a front view of a video display unit 10 used. Eyesight device
The configuration is the same as that of the second embodiment.
Only the functions of stored programs (not shown) differ
It is. In this eyesight device, as shown in FIG.
Input the direction indicated by the optotype mark 11 on the video display unit 10.
You. If the input by the subject is accurate, the control means 14
Display small target marks 11 on the video display 10
I will do it. At this time, the visual acuity value 12 is not displayed.
No. The size of the optotype mark 11 is reduced, resulting in a large screen.
Small optotype mark 11 is displayed on the
Then, the accommodation function of the subject's eye becomes unstable. others
As shown in FIG. 6 (b), the frame
Is displayed. There is this surrounding figure 17
And the accommodation function of the subject's eye is stable, accurate eyesight value is measured
Will be. This measurement result is finally displayed on the video display unit 10.
Will be displayed. In each of the above embodiments, the response means
The joystick is used, but the response means is the input
The method does not need to be particularly limited.
Input device, or a form that inputs by voice, etc.
You may. FIG. 7 is a block diagram of the fourth embodiment. liquid crystal
Square matrices for displaying optotype marks 21
Display unit 22 and the subject performs measurement and eyesight training by himself.
Input the direction of the optotype mark 21
Response means 23 such as a computer, the control means 2 including a computer
4 is connected. FIG. 8 shows a portion of the square matrix display section 22.
It is an enlarged view. Each pixel 25 is a square and a matrix
It is arranged in a shape. Each of these pixels 25 is composed of a liquid crystal.
Control the transmittance by changing the voltage
can do. The pixel 25 is composed of a plurality of
The mark 21a and the optotype mark 21b are formed. Optotype marker
The mark 21a and the optotype mark 21b correspond to the vertical and horizontal pixels 25.
Numbers are selected to be equal and fit in a square area
And the pixel 25 is square,
Even if the direction of the mark 21a and the optotype mark 21b is changed, the contour shape
Will not change. Construct an optotype mark of minimum size
By forming the line with a width of one pixel, square mat
The number of pixels constituting the ricks display section 22 should be minimized.
Can be. For example, an optotype mark with a visual acuity of 1.0
If it is composed of pixel lines, the visual acuity 0.1 is 10 pixels wide
Line. As shown in FIG.
In the case of a target mark whose size is 5 times the line width,
If there are at least 50 × 50 pixels 25, from 0.1
It is possible to display the optotype mark 21 up to 1.0.
You. FIGS. 9 and 10 show another example of the target mark 21. FIG.
FIG. 9 is an explanatory view of the cinelen mark, and FIG.
Explanatory drawing of a target mark 21 approximating a Landolt ring mark
It is. There are four directions of the optotype mark 21, but the order of presentation
If you do the order at random, the presentation order will be different every time
I can't remember it. FIG. 11 shows a fringe target 28 during MTF measurement.
FIG. MTF measurements are available at various spatial frequencies.
The horizontal stripe target 28 is moved in a direction orthogonal to the stripe pattern.
From the zero contrast state of the fringe target 28
The contra can check the moving direction of the fringe target 28
It is a measurement to check the limit of strike. The test subject was
Measurement is performed by inputting the movement direction from the input means.
U. In FIG. 11, the stripe target 28 moves in the direction of the arrow.
It is assumed that The stripe target 28 is square as in the above embodiment.
Square matrix with pixels 25 arranged in a matrix
It is displayed on the display unit 22. Square stripe pixel 28
25 and the horizontal and vertical directions
The same stripe target 28 can be displayed in the same direction. in this case
The minimum of the stripe target 28 for displaying the size of the pixel 25
The pitch is twice as large as the pitch of the other fringe targets 28
The number of pixels should be kept to a minimum if it is an integral multiple of
Can be. The spatial frequency of the stripe target 28 is 5 to 10 types.
It is convenient to have a similar preparation. FIG. 12 shows only one small target mark 21.
FIG. 9 is an explanatory diagram when displaying. Square matrix display
22 is composed of a line having the same line width around the optotype mark 21.
The surrounding graphic 29 consisting of the frame is displayed at the same time. What's around
And there is only one small optotype,
The measured value may fluctuate due to unstable knot condition.
In such a case, the accommodation of the eyes is stabilized, which is preferable. Square mat
The ricks display unit 22 displays the surrounding figure 29 of this degree as an optotype.
It is easy to project with the mark 21. FIG. 13 is a block diagram of the fifth embodiment.
In front of the author S, it is optically distant by the lens 31.
And a visual acuity target display unit 32 composed of a liquid crystal or the like is disposed.
In the peripheral visual field of the visual acuity target display unit 32, a distant target is presented.
Is provided. Also see
Light sources 34a and 34b are arranged in the direction of the target.
You. The output of the control means 35 is connected to the visual acuity target display section 32.
The control means 35 has four input buttons 36a to 36d.
The output of the responding means 36 is connected. In addition,
The power target display section 32 and the distant view target display section 33 are not shown.
It is illuminated from behind by a light source. At the time of training, the operator who is the trainee
S is a visual acuity chart optically from a distance, looking into the lens 31
The indicator 32 is visually recognized. As shown in FIG.
5, a symbol generation circuit (not shown) provided inside
Generated visual acuity mark 37 and visual acuity value representing its size
38 is a computer (not shown) provided in the control means 35.
Visual acuity target display unit according to the program stored in the
32 is displayed. The operator S determines the direction indicated by the visual acuity mark 37.
In response to the direction of the visual acuity mark 37 of the response means 36.
One of the input buttons 36a to 36d is pressed. response
The input signal from the means 36 is taken into the control means 35
Correctness is determined, and a voice notifying the correctness is issued. First
A visual acuity mark 37 showing a large visual acuity value 38 is presented
If the correct answer continues once or twice,
5 is a modification of the visual acuity target display section 32, and a smaller visual acuity marker.
The screen 37 is displayed. If the input is incorrect, the control
Step 35 does not change the size in the visual acuity target display unit 32,
Display the changed visual acuity mark 37. In addition, training
The display signal of the visual acuity value 38 representing the performance at the time is a visual acuity target display.
Based on the size of the visual acuity mark 37 displayed on the unit 32
It may be created. Alternatively, the controller 35
The input signal of the response means 36 is stored, and the
It can also be done. In this embodiment, as shown in FIG.
The same visual acuity mark 37 in a matrix
The visual acuity target display unit 32 is displayed on the display unit 32.
Of the sight mark 37
Because of the pattern, the adjustment of the eyes of the operator S is stabilized.
This is preferred. As shown in FIG.
When 37 is large, the number of displayed visual acuity marks 37
Then, as shown in Fig. 14 (b),
When the mark 37 becomes even smaller, the visual acuity target
Visual acuity displayed so that there is no extra blank space at 32
The number of marks 37 is increased. It should be noted that the size and direction are the same as in a normal visual acuity table.
Are displayed to the operator S
Good. In this case, identification that causes the operator S to respond to the direction
It is necessary to indicate the eyesight mark 37 of the
is there. And every time the visual recognition response of the operator S is a wrong answer
The direction of the specified specific visual acuity mark 37 is changed
It is desirable. Further, a stripe target 39 as shown in FIG.
It may be presented to the author S. In this case, the stripe target 39
The operator S is moved in a direction perpendicular to the stripe pattern, and the operator S
9 is input by the response means 36. At first,
A stripe target 39 having a rough stripe pattern is presented as shown in FIG.
Each time the response is correct, as shown in FIG.
A stripe target 39 having a gradually fine pattern is presented. In addition,
The numerical value of the visual acuity target display unit 32 is the visual acuity value of the operator S at the time of operation.
The arrow in the figure indicates the moving direction of the stripe target 39.
The moving direction is determined by the control means 35 for each response.
It is changed to random. FIG. 16 is a block diagram of the sixth embodiment.
A lens 42 is provided on the front surface of the optotype systems 41L and 41R for the right eye.
L and 42R are arranged, and optotype display units 43L and 4L are provided on the rear surface.
3R is arranged. Target system 41L, 41R is interpupillary tone
It is connected by the joint mechanism 44, and by the rotation of the knob 44a,
The interval is adjustable. The lenses 42L and 42R
Connected by drive means 45, linked with rotation of knob 45a
And moved back and forth, and the appearance of the optotype display units 43L and 43R
The diopter is changed. And the target
The outputs of the control means 46 are connected to the display units 43L and 43R.
The control means 46 has a response button 47a and two selection buttons 47
b, the output of the response means 47 having 47c is connected.
You. In order for the operator S to perform eyesight training, first, the interpupillary distance
Adjustment mechanism 44 and knobs 44a and 45a of drive means 45
Is rotated and the distance between the optotype systems 41L and 41R and the optotype display section
Adjust the apparent diopter of 43L and 43R. Therefore,
Author S can perform training while wearing glasses.
You. FIG. 17 shows an optotype display section 43L during visual acuity training.
43R is a front view of FIG.
A human face selection mer with four different expressions as shown
And the chain line surrounding this option mark 48
Selection frame 49 and a human face arranged in a matrix
Optotype with the same expression as any one of the selection marks 48
The mark 50 is stored in the program stored in the control means 46.
Therefore, it is displayed on either one of the optotype display units 43L and 43R.
And presented to the trained eye of the operator S. The operator S determines the type of the target mark 50.
Option mark 48 which is determined to be the same as the target mark 50
Is surrounded by a selection frame 49. The movement of the selection frame 49 is determined by the response
The selection is performed using the selection buttons 47b and 47c of the stage 47. Selection button 47b,
Each time you press 47c, the selection frame 49 is selected in the horizontal direction
It moves by one of the branch marks 48. Selection mark 48 is selected
If the user can make a selection,
The response button 47a of the step 47 is pressed. Input from response means 47
The signal is taken into the control means 46, and it is determined whether the signal is correct or incorrect.
The display of the mark display portions 43L and 43R is changed. If the answer is wrong, only the target mark 50 is displayed.
The target mark 50 having a different expression is presented again.
If the answer is correct, the optotype display units 43L and 43R are displayed.
Has been completely renewed, and spades and the like as shown in FIG.
A choice mark 48 consisting of four playing card suits,
A selection frame 49 surrounding this selection mark 48 and a matrix
Same as one of the option marks 48
The target mark 50 is displayed. The operator S
Judgment of the type of the target mark 50 of the suit of the
Move the selection frame 49 by the response means 47 and
The branch mark 48 is selected and determined. Response signal of response means 47
The signal is taken into the control means 46 to determine whether it is correct or not. Mistake
If it is the answer, the target mark 50 of the suit of Trump is again
It is presented, and if the answer is correct, a different type of selection mark 48
And the target mark 50 are presented. To summarize the training procedure, first, the eyesight is maintained.
As shown in Fig. 17 (a),
The target mark 50 having a human surface is displayed on the target display units 43L and 43R.
indicate. A correct response to this optotype mark 50
Then another smaller pattern is presented. Optotype display section 4
3L and 43R are the suits of the playing cards as shown in FIG. 17 (b).
Training is performed until the target mark 50 is displayed. This
If you try to train, keep your eyesight above a certain value
be able to. The next stage is the actual training, and the target display unit
43L and 43R, as shown in FIG.
A target mark 50 made of a suit is displayed. This state
In the state, the selection mark 48, the target
Change the type of mark 50 and gradually reduce the size of the target mark 50
I will go down. And if the response of the operator S is a wrong answer
For example, using the same selection mark 48,
48 is randomly selected as a target mark 50.
indicate. During training, the response to the trainee is
It is preferable to transmit the information, but it can be omitted. response
When the selection mark 48 is determined by the means 47,
Of the selection mark 48 and the mark 50
The size is changed, and this change causes the operator S to make a correct or incorrect response.
Can be determined. In this embodiment, separately from the optotype mark 50,
Since the selection mark 48 is presented to the operator S,
Since the person S tries to confirm the option mark 48,
The tension of distant vision is added to relieve the overstrain of near vision.
Can be. FIG. 18 shows an optotype display 43 during stereoscopic vision training.
It is a front view of L, 43R, and 4 surrounded by the surrounding figure 51.
The linear target 52 and the cross-shaped selection cursor 53 are
Are displayed on the mark display sections 43L and 43R, respectively, and presented to both eyes.
Is shown. Parallax 52 is given parallax.
Therefore, when viewed with both eyes, stereoscopic vision can be achieved. At this time, the linear target 5
Any one of 2 has extra parallax compared to others
It feels like the depth is different from the remaining three. operation
Person S pushes the selection buttons 47b and 47c of the response means 47,
Move the selection cursor 53 left and right, and the depths are different
Is selected, and press the response button 47a.
To confirm. If the answer is correct, gradually increase the degree of parallax
The linear target 52 is presented in a smaller size, as shown in FIG.
The result of the training is numerically displayed as the visual angle 54. The target mark for stereoscopic vision training is a linear target 5
It is not limited to 2 but one of figures having a certain pattern
Part slightly to the left and right to provide optotype marks for the left and right eyes.
Can be. Alternatively, the target display 43
When L and 43R are configured, the sentence is formed by the random dot method.
Characters or the like may be displayed. Different target markers based on viewing angle 54
The training result is presented to the operator S at the viewing angle 54
Instead of communicating, the grade is based on the change of the target mark presented
Can be determined. FIG. 19 is a block diagram of the seventh embodiment.
On the display 71 arranged far from the author S,
A target mark 72, a visual acuity value 73 representing its size,
A selection frame 74 surrounding the target mark 72 to be answered is displayed.
I have. The output of the image symbol generating means 75 is displayed on the display 71.
Is connected, and the training distance is input to the video symbol generating means 75.
Input unit 76a and infrared signal receiving unit 76b
Is connected to the output of the control means 76 having
Controlling. And the response means 77 is prepared at hand.
Then, the direction of the optotype mark 72 is input to the response means 77.
Response button 77a and infrared signal generator 77b
Is provided. The image symbol generating means 75 has a built-in half
Various optotype marks 72 are stored in the conductor memory for control.
In accordance with the program stored in the computer of the means 76
Output from the memory to the display 71 as a video signal.
Then, the visual acuity value 73 and the selection frame 74 are displayed together. operation
The observer S observes the display 71 and determines the direction of the optotype mark 72.
And press the response button 77a of the response means 77 to input
Do. Note that a commercially available television receiver is used for the display 71.
In this case, the video symbol generating means 75
The standardized video signal is output to the display 71.
Good. When using a liquid crystal display dedicated to the eyesight device,
The type of the output signal of the video symbol generating means 75 is different from that of the embodiment.
Many can be used. At the time of training, first, the input unit 7 of the control means 76
Input the distance from the operator S to the display 71 in 6a.
You. 5m or more is desirable for eyesight training, but use at home
In this case, it may be about 3 m. In the control means 76, the input
Corresponding to the visual acuity value 73 based on the value input to the section 76a.
The size of the target mark 72 is calculated,
By controlling the step 75, the target mark 72 is displayed on the display 71.
Let The displayed visual acuity value 73 has, for example, three levels of magnitude.
The minimum value of the visual acuity value 73 held and displayed is the visual acuity of the operator S.
Is equivalent to In the state of FIG. 19, the visual acuity of the operator S is 0.5
It turns out that it is. At this time, the selection frame 74 indicates the operator S
Optotype marker with visual acuity 0.6 smaller than visual acuity
Surrounds The operator S observes the display 71 from a distance.
The direction of the visual acuity mark 72 is determined, and the response corresponding to the direction is determined.
The response button 77a of the response means 77 is pressed. In response to this input,
An infrared signal is generated from the infrared signal generator 77b,
Received by the infrared signal receiving section 76b of the
The correctness of the second response is determined. Same for the second response
In order to perform for the target mark 72 representing the visual acuity value 73,
The change in the display of the indicator 71 indicates that the selection frame 74 is different from the target mark 7.
It only moves to 2. Two correct responses
The screen of the display 71 will be refreshed,
The optotype mark 72 corresponding to the force value 73 is displayed, and 0.7
Training using optotype mark 72 with visual acuity value 73
I do. In this case, if the response is correct twice consecutively, the display
The screen 71 is modified as described above. In this embodiment, two consecutive correct responses are obtained.
Until obtained, a target mark 72 having the same visual acuity value 73
The operator S uses the display 7
The correctness of the response can be determined from the change in the display of 1 and displayed.
The visual acuity during training can be known from the visual acuity value 73. FIG. 20 shows a display 71 according to the eighth embodiment.
FIG. 14 is a front view of a sight device having the same configuration as that of the sixth embodiment.
And correctness of the function and response of the program of the control means 76
Sound generation means (not shown) for notifying
Is different. As shown in FIG. 20 (a), this eyesight device
The target mark 72 is displayed on the display 71 one by one. operation
The person S visually recognizes the display 71 and moves toward the optotype mark 72.
The direction is input to the control means 76 using the response means 77. System
The control means 76 determines whether the response is correct or not, and
If the answer is incorrect, an incorrect answer sound is generated by a voice generator (not shown).
The size of the optotype mark 72 is fixed and only the direction is changed.
To If the response is correct, give the correct sound to the sound generator.
And a response is displayed on the display 71 as shown in FIG.
The visual acuity value 73 of the performed target mark 72 is displayed, and the operator S
Show your grades. The operator S performs training based on the visual acuity value 73.
It is determined whether or not to continue. If you continue training
Indicates that the target mark 72 is displayed on the display 71
It is. FIG. 21 shows a visual acuity value display section 80 according to the ninth embodiment.
FIG. The eyesight device is almost the same as the sixth embodiment.
Instead of displaying the visual acuity value 73 on the display 71,
The visual acuity value display section 80 dedicated to displaying the visual acuity value 73 is easy to recognize.
Attached to the upper part of the video symbol generator 75
The display unit 80 sequentially displays the visual acuity values 73 during training. Note that this visual acuity value display section 80 is
It can also be provided in the response means 77 at hand. This place
In such cases, the user frequently looks at the visual acuity value display section 80 during training.
Efforts to adjust the eyes from distant to near vision
It is good for eyesight training because it gives strength. As described above, the eyesight device according to the present invention
The display shows stripes with different pitches and moving directions,
Since the moving direction is determined, the configuration is simplified. [0063]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a first embodiment. FIG. 2 is a front view of visual acuity target display means. FIG. 3 is a configuration diagram of a second embodiment. FIG. 4 is an explanatory diagram of a training procedure example. FIG. 5 is a front view of the image display means. FIG. 6 is a front view of a third embodiment. FIG. 7 is a configuration diagram of a fourth embodiment. FIG. 8 is an enlarged view of a display unit. FIG. 9 is an explanatory diagram of a Sirenen-type target mark. FIG. 10 is an explanatory diagram of a target mark similar to a Landolt ring. FIG. 11 is an explanatory diagram of an MTF measurement stripe target. FIG. 12 is an explanatory diagram of a small optotype mark and a frame edge line. FIG. 13 is a configuration diagram of a fifth embodiment. FIG. 14 is a front view of a visual acuity target display unit during visual acuity training. FIG. 15 is an explanatory diagram of a stripe target. FIG. 16 is a configuration diagram of a sixth embodiment. FIG. 17 is a front view of an optotype display section during eyesight training. FIG. 18 is a front view of an optotype display unit during stereoscopic vision training. FIG. 19 is a configuration diagram of a seventh embodiment. FIG. 20 is a front view of the display of the eighth embodiment. FIG. 21 is a front view of a visual acuity value display unit according to a ninth embodiment. [Description of Signs] 3, 32, 37, 43L, 43R, 50, 72 Visual acuity target display units 4, 11, 21 Visual target mark 5 Visual acuity mark display unit 6, 80 Visual acuity value display units 7, 14, 24, 35, 76 Control means 8 Speakers 9, 13, 23, 36, 77 Responding means 10 Image display 17, 29, 51 Surrounding figure 22 Square matrix display 25 Pixel 28, 39 Stripe optotype 33 Far view optotype display 44 Eye Width adjustment mechanisms 48, 74 Choice mark 49 Selection frame 52 Linear optotype 53 Selection cursor 71 Display 75 Image symbol generation means

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61B 3/00-3/09

Claims (1)

(57) [Claim 1] An electronic figure display means comprising a matrix of pixels displays fringes having different pitches and moving directions, and measures visual acuity by judging the moving direction. Characteristic visual acuity device.