JP2003088501A - Visual acuity testing device and visual acuity testing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visual acuity testing device and visual acuity testing system capable of easily testing the practical visual acuity of a subject. SOLUTION: This visual acuity testing device comprises a target presentation means for successively presenting visual acuity testing targets to the subject, an input means for inputting the answer of the subject, and a means for whether the inputted answer is right or not to test the visual acuity of the subject. This device further comprises a mode switching means for switching a general visual acuity testing mode for measuring the general visual acuity of the eye to be tested to a practical visual acuity testing mode for measuring the visual acuity change when continuing the eyelid opening of the eye to be tested; a target presentation program for presenting a target of a visual acuity value corresponding to the general visual acuity value of the eye first to start a test, and presenting a target of a lower visual acuity value when the answer of the subject does not satisfy a prescribed standard; and a measurement result storing means for storing the measurement result in the practical visual acuity testing mode together with time axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing a visual acuity test and a visual acuity test system.

[0002]

2. Description of the Related Art Conventionally, there has been known a visual acuity test apparatus for presenting a visual target to a subject and inspecting and measuring the visual acuity of the subject based on the response. This visual acuity test apparatus shows an optotype having a predetermined visual acuity value to a subject, and if the optotype is correctly discriminated (or, if the correct answer satisfies a predetermined criterion, such as two correct answers out of three). ), And then presents a target with a higher visual acuity value. If the next target is also correctly discriminated, a target with an even higher visual acuity value is presented. In this way, the maximum visual acuity value of the visual target that can be discriminated by the subject is obtained (hereinafter, the visual acuity obtained by such visual acuity test is referred to as "normal visual acuity").

[0003]

In the normal visual acuity test as described above, the examinee narrows his eyes, increases the number of blinks more than usual, and keeps the condition of his eyes most visible. In many cases, the person's eyesight is said to be 1.5 if he / she is faced with an examination and an index with a sight value of 1.5 is seen even for a moment.

However, the normal visual acuity is the visual acuity at the moment when the condition of the surface of the eye is moistened and adjusted, and the blinking decreases when driving a car or concentrating on something. While you are not blinking, your eyes are dry and your eyesight is poor. In this way, the visual acuity that the subject actually sees on a daily basis (visual acuity at a practical level: hereinafter referred to as "practical visual acuity") is
The result may be different from the result of the normal vision test described above. In particular, it is said that the difference between the normal visual acuity and the practical visual acuity obtained by the conventional visual acuity test is large when the eye has undergone refractive surgery and in the case of a subject having dry eye.

The present invention has been made in view of the above problems of the prior art.
It is a technical object to provide a visual acuity test device and a visual acuity test system capable of easily inspecting a subject's practical visual acuity.

[0006]

In order to solve the above problems, the present invention is characterized by having the following configuration. (1) It has an optotype presenting means for sequentially presenting the visual acuity test optotypes to the subject, an inputting means for inputting the response of the subject, and a determining means for judging the correctness of the input response, In a visual acuity test apparatus for testing the visual acuity of a person, a mode for switching from a normal visual acuity test mode for measuring a normal visual acuity of an eye to be examined to a practical visual acuity test mode for measuring a visual acuity change of an eye to be inspected while an eyelid is maintained.
The switching means and the visual target of the visual acuity value corresponding to the normal visual acuity value of the eye to be examined are first presented to start the examination, and when the response of the subject does not satisfy the predetermined standard, the visual acuity value of the lower visual acuity value is The present invention is characterized by comprising an optotype presenting program for presenting a target and a measurement result storage means for storing the measurement result in the practical visual acuity test mode together with the time axis. (2) The test object presenting means for sequentially presenting the visual acuity test optotypes to the subject, the input means for inputting the response of the subject, and the determining means for judging the correctness of the input response are provided. In a visual acuity test device for inspecting the visual acuity of a person, a mode switching means for switching to a practical visual acuity test mode for measuring a visual acuity change of an eye to be inspected when an eyelid is maintained, and a visual acuity corresponding to a normal visual acuity value of the eye to be inspected. A target presenting program that presents a target with a lower visual acuity value when the subject's response does not meet the predetermined criteria, and the eyelids are opened. The present invention is characterized by comprising a program ending means for detecting the state and ending the optotype presenting program when there is a blink, and a measurement result storing means for storing the measurement result in the practical visual acuity test mode. (3) In the visual acuity test apparatus according to (2), the program terminating means has an optical detecting means for optically detecting the open eyelid state of the eye to be inspected. (4) The visual acuity test apparatus according to (1) and (2) is characterized by including a time changing unit that changes a predetermined presentation time of the presentation target. (5) The visual acuity test apparatus according to (1) and (2) is for changing the visual acuity value changing step to be reduced to one step or a plurality of steps when the correct answer to the presented visual target does not satisfy a predetermined criterion. It is characterized by having a means for changing a visual acuity value changing step. (6) A communication terminal having a presentation screen for presenting an optotype having a predetermined visual acuity value and a response means for making a response of the subject to the presented optotype, and via the communication terminal and a communication network. And a server in which an optotype presenting program for visual acuity measurement that changes the presentation of the optotype according to the response result to the presenting optotype is recorded, and the server is accessed by the communication terminal. Then, the optotype presenting program is executed to sequentially present optotypes on the presenting screen to measure visual acuity. (7) In the visual acuity test system according to (6), the optotype presenting program presents optotypes at the same visual acuity level when the correct answer to the presented optotypes meets a predetermined criterion, and The method is characterized by including a step of presenting a target at a visual acuity value lower than the visual acuity value when the correct answer does not satisfy a predetermined criterion. (8) In the visual acuity test system according to (7), the communication terminal has an input unit for inputting a distance between the presentation screen and an eye to be inspected, and the optotype presenting program is based on the input distance. It is characterized by including a step of determining the size of the optotype to be presented on the presentation screen. (9) The visual acuity test system according to (8) is characterized in that a general-purpose personal computer or a mobile phone is used as the communication terminal.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> First, as a first embodiment, a case will be described in which the present invention is applied to a visual acuity test apparatus that is used at a position separated from a subject by a predetermined distance. FIG. 1 is a schematic view of the visual acuity test apparatus according to the first embodiment, and FIG. 2 is a schematic view of an optical system and a control system of the visual acuity test apparatus. Reference numeral 1 denotes an apparatus main body that presents an optotype, and a window 2 made of a glass plate provided with an antireflection film is arranged in the upper front part, and a subject views the optotype at the center through the window 2. The window 2 may be provided with a filter instead of the glass plate. The inside of the device main body 1 is painted black to make the internal structure hard to see.

Reference numeral 20 is a control box used by the examiner. Reference numeral 21 denotes an operation unit for switching the presented optotypes and various settings for visual acuity measurement (visual acuity test). 22
Is a display unit for displaying the presented target and the result of the visual acuity test. The display unit 22 in this embodiment is a liquid crystal touch panel, and in addition to the display of the visual target and the inspection result,
It also has a button function for various settings in the visual acuity test and operations such as starting the test. Reference numeral 23 is an output unit composed of a printer, which can output the examination result (measurement result) of the subject.

By using the control box 20, it is possible to switch the visual target presented by the apparatus main body 1 and perform various settings in the visual acuity test. The control signal from the control box 20 is received by the transmission / reception unit 3 provided on the apparatus main body 1 side by infrared communication, and the visual target is presented based on the control signal.

Reference numeral 30 is a response box used by the subject. The response box 30 is provided with a joystick 31 for indicating the direction of the optotype (here, Landolt ring) discriminated by the subject, and a response button 32 used when the optotype cannot be discriminated. The response box 30 is connected to the control box 20 via the cable 4, and the response signal from the response box 30 is transmitted to the control box 20 through the cable 4. In this embodiment, the cable 4 is used to connect the control box 20 and the response box 30.
The present invention is not limited to this, and wireless communication such as infrared communication may be used. A start button 33 is provided on the response box 30 to start an inspection (measurement).

FIG. 2 is a diagram showing an outline of an optical system and a control system of the visual acuity test apparatus used in this embodiment. Reference numeral 10 denotes an optotype presenting section, which is arranged in the lower portion of the apparatus main body 1.
The optotype presenting unit 10 is a disk-shaped disc made of a glass plate, and an optotype disc plate having a large number of visual acuity test optotypes such as visual acuity index optotypes formed on the same circumference by chrome vapor deposition or the like. , A mask plate for masking a part of the presentation target,
It is composed of a drive unit for rotationally driving the optotype disc plate and the mask plate, an illumination lamp for illuminating the inspection optotype on the optotype disc plate, and other optical members.

The visual target used in the present embodiment is a visual logarithm of the minimum separation threshold in common logarithm (logarithm of the minimum angle of resolutio.
n: Below is LogMAR. ) Is used. Here Log
Although the MAR target is used, the target is not limited to this, and a target using a conventionally used visual acuity value may be used. The optotype presenting unit 10 rotates the optotype disc plate and the mask plate based on the signal received from the transmitting / receiving unit 3 to position a predetermined inspection optotype on the optical axis of the illumination lamp.

Reference numeral 11 denotes a concave mirror, which is attached to the upper surface inside the apparatus main body 1. Reference numeral 12 denotes a beam splitter, which is placed in the optical path between the optotype presenting unit 10 and the concave mirror 11. Further, the concave mirror 11 in the present embodiment sets the optical distance between the visual target and the eye to be examined to be 5 m when the distance between the eye to be inspected and the window 2 of the visual acuity device main body 1 is 0.9 m. Its focal length is designed.

The light flux of the inspection target illuminated by the illumination lamp of the target presenting section 10 goes upward, passes through the beam splitter 12 installed above, and then the concave mirror 1
It is reflected at 1. The target luminous flux reflected by the concave mirror 11 is reflected by the beam splitter 12 and travels toward the subject's eye through the window 2.

Reference numeral 24 is a control unit for performing various controls of the entire visual acuity test apparatus. The control unit 24 controls signals from the response unit 30, various operations on the control box 20, driving of the apparatus main body 1 side, and the like, and can also measure measurement time and record measurement contents. Reference numeral 25 denotes a transmission / reception unit for transmitting a control signal from the control box 20 to the apparatus body 1 and receiving a signal from the apparatus body 1 side.

The operation of the visual acuity test apparatus having the above-mentioned structure will be described with reference to the flowchart of FIG. 3 and the operation screen of the display unit 22 shown in FIGS. The examiner first performs the conventional visual acuity measurement (visual acuity test) to obtain the normal visual acuity of the subject. The examiner uses the operation unit 21 and the display unit 22 of the control box 20 to previously input the name, sex, age, data No., etc. of the subject. Next, the examiner controls the control box 20.
By pressing each display column (R, both eyes, L) of the display frame 40 for normal vision displayed on the display unit 22 of 1, the eye for measurement of normal vision is selected. By pressing the start button 41 after selecting the measurement eye, the optotype presenting program for normal vision is executed.

When the start button 41 is pressed, the control unit 24
Uses the optotype presenting unit 10 according to the set optotype presenting program for normal vision to present a Landolt ring having a predetermined visual acuity value (visual acuity value of 0.5 at the start) in the apparatus main body 1. The shape of the presented optotype (discontinuity direction) is displayed in the optotype display field 42 of the display unit 22.

The examinee inputs the break direction of the optotype (Landolt ring) presented in the apparatus body 1 with the joystick 31 of the response box 30. When the cut direction of the optotype is not known, the response button 32 is used to notify the control unit 24 that it cannot be identified. Upon receiving the response from the subject, the control unit 24 determines whether the response to the presented optotype is correct. If the response is correct, the target having the next higher visual acuity value is presented. After that, a target having a one-step higher visual acuity value is presented until there is a wrong answer. If the answer is incorrect for the initially presented optotype, the optotype having a lower visual acuity value is presented. After that, until the correct answer is obtained (or until the minimum visual acuity value is reached), the visual target having the visual acuity value one step lower is presented. If there is a wrong answer while increasing the visual acuity value, or if there is a correct answer while decreasing the visual acuity value, the targets with the same visual acuity value in different directions are presented. If there are two correct answers (two correct answers out of three) for the target of the same visual acuity value, it is determined that the target has the visual acuity value. If there are two wrong answers (two wrong answers out of three) for the target of the same visual acuity value, it is determined that the visual acuity is less than that visual acuity value. In this way, the visual targets are sequentially presented, and the highest visual acuity that can be discriminated by the subject is measured as normal visual acuity.

After the measurement of the normal visual acuity is completed, the practical visual acuity is measured next. The control unit 24 switches the display of the display unit 22 to the display for practical visual acuity measurement (see FIG. 5A). At this time, the visual acuity value obtained by the normal visual acuity measurement is displayed in the display field of the normal visual acuity display frame 40. In practical vision measurement,
Measure your visual acuity while you are not blinking. The examiner informs the subject that the measurement is completed when the subject blinks, and instructs the subject not to blink as much as possible during the measurement.

The examiner presses each display field (R, both eyes, L) of the display frame 43 for practical visual acuity to select the eye for measuring practical visual acuity (here, the right eye is selected). The control unit 24 inverts the display state of the selected display column and emphasizes the selected place (selected eye). The examiner presses the start button 41 (or the start button 33) to start the optotype presenting program for measuring the practical visual acuity.

When the start button 41 is pressed, the control unit 24 displays the optotype having the visual acuity value obtained by the normal visual acuity measurement using the visual target presenting unit 10 (normal visual acuity value is 1.25 here). It is presented in the apparatus main body 1 as a presentation target at the start of measurement. At the same time, the control unit 24 causes the practical visual acuity display frame 43 of the display unit 22 to display the normal visual acuity value of the selected eye. In addition, as in the normal visual acuity measurement, the optotypes presented in the apparatus body 1 are displayed in the optotype display field 42 of the display unit 22. When the start button 41 is pressed, the control unit 24 erases the start button 41 displayed on the display unit 22 and instead displays the end button 44 on the display unit 22 (see FIG. 5B).

The subject sees the optotypes presented in the apparatus main body 1 and inputs the direction of the cut using the joystick 31. Response button 3 if the target cannot be identified
Use 2. When a correct answer is input, the control unit 24 controls the optotype presenting unit 10 so as to present the optotype by randomly switching the cut direction of the optotype while keeping the visual acuity value as it is. When an incorrect answer is input, the control unit 24 controls the optotype presenting unit 10 to present the optotype by making the visual acuity value worse (lower) by one level and randomly switching the break direction of the optotype.

Further, when there is no response from the subject within a predetermined time (here, 2 seconds) after the optotype is presented,
As an erroneous answer, the control unit 24 performs control so that an optotype having a visual acuity value one step lower is presented in the apparatus body 1.
While the correct answer continues, the control unit 24 performs control so as to randomly present the visual target having the same visual acuity value. Further control unit 2
Reference numeral 4 measures the time required for the response to the visual acuity value of the presented optotype and stores it in the memory in the control unit 22. Further, the control unit 24 displays the visual acuity value of the presented target on the display frame 4
3, and the measurement time from the start of measuring the practical visual acuity is also sequentially displayed in the measurement time column of the display frame 43.

The examiner pushes the end button 44 of the display unit 22 when the subject blinks. When the end button 44 is pressed, the control unit 24 ends the measurement of the practical visual acuity, displays the fact that the measurement is completed on the display unit 22, and displays the result of the practical visual acuity value of the eye to be examined in the display frame 43. In addition, the control unit 24 has a maximum length of 6 even if the subject does not blink.
The control is performed so that the measurement is performed only for 0 seconds. In the present embodiment, the maximum measurement time is 60 seconds, but the measurement time is not limited to this and may be any measurement time sufficient for practical visual acuity measurement. Further, instead of deciding the measurement time for ending the measurement, the measurement can be ended by the number of times of presenting the target and the number of consecutive correct answers.

In the above, when the response of the subject is an incorrect answer, the visual acuity value is always switched to one step lower. However, like the normal visual acuity measurement, a correct answer satisfying a predetermined standard cannot be obtained. When (when majority of correct answers such as 2 out of 3 are not obtained), it is less than that visual acuity value, and when a correct answer (more than a majority of correct answers) of a predetermined standard is obtained, it is the same as having that visual acuity value. The visual acuity value may be continuously presented.

Further, the examiner may input the response of the subject. Furthermore, the examiner may determine whether the verbal response of the subject is correct, and input the determination result of the correctness.

When it is desired to output the measurement result after the practical visual acuity measurement is completed, the operation unit 21 of the control box 20 is used.
Is used to output the measurement result from the output unit 23. Figure 6
FIG. 6 is a diagram showing an outline of print contents output from the output unit 23.

Reference numeral 50 is a printing paper sheet output from the output unit 23 and printed with the measurement results. Reference numeral 51 is a subject data display field printed on the upper portion of the printing paper 50, on which subject data (name, age, sex, etc.) input in advance is printed. Reference numeral 52 is a display field for a normal visual acuity value (Normal.VA). Below the display column 52, the result of the practical visual acuity (Utility.VA) with the same measurement eye as the measurement eye in the display column 52 is printed. Here, in the display column 53, the time (seconds) from the start of measurement to the time when each optotype is presented is printed. The display field 54 is printed with the visual acuity value of the presented visual acuity at the time shown in the display field 53, and the display field 55 is printed with the time from the presentation of the optotype to the input of an answer.

The visual acuity value printed in the display field 54 is
The print is left-justified at the start of the measurement, but the print shifts to the right as the visual acuity value becomes lower (worse).
As a result, it is possible to visually recognize the change in the visual acuity value with time.

As described above, in the present embodiment, the visual acuity value obtained by the normal visual acuity when the practical visual acuity is obtained is used as a starting point, and if there is no wrong answer or there is no response within the predetermined time, the visual acuity value is set to one step. Although it is set to be low, the changing stage of the visual acuity value may be changed depending on the response content of the subject. In this case, by using the setting button 45 of the display unit 22, it is possible to call the mode setting list screen and select the visual acuity value change stage in the visual acuity value change amount setting field 46 (see FIG. 7).

For example, when the visual acuity value of the target to be presented is always an incorrect answer because the visual acuity value of the subject is not in time, the visual acuity value is not set to be lowered by one step, and the visual acuity value is skipped by one step to obtain a lower visual acuity value. A setting may be made to present (a visual acuity value that is two steps lower than the previously presented visual acuity value). Further, instead of setting the amount of change in the visual acuity value in advance, if the wrong answer is given twice or more in succession during the practical visual acuity measurement, the control unit 24 presents the next presented visual acuity value by lowering it by two steps or more. You may do it.

Although the reaction waiting time for the response to the presented optotype is set to 2 seconds, the present invention is not limited to this, and the reaction waiting time can be selected on the mode setting list screen. In this case, the reaction waiting time setting field 47 shown in FIG.
The reaction waiting time can be selected from 1 second and 2 seconds.

Further, in the present embodiment, the normal visual acuity measurement is followed by the practical visual acuity measurement, but the present invention is not limited to this, and if the normal visual acuity value of the subject is known in advance, that value is obtained. By inputting, the practical visual acuity measurement can be performed without obtaining the normal visual acuity measurement. In such a case as well, the optotype having the input visual acuity value may be used as the first presented optotype for the practical visual acuity measurement.

In the above embodiments, the visual acuity test placed at a predetermined distance from the subject is used, but the present invention is not limited to this, and the visual target presented inside the apparatus main body is examined. It can also be applied to a visual acuity test device of a type that a person looks into and uses. As a second embodiment, a case where the present invention is applied to a peep type visual acuity test apparatus will be described.

<Embodiment 2> FIG. 8 is a diagram showing an outline of an optical system, a control system and the like in a sight-type visual acuity test apparatus. Reference numeral 100 is a main body of the apparatus. Reference numeral 101 is an objective lens, and the subject can see a part of the optotype disc plate 102 installed inside the housing through the objective lens 101. The optotype disc plate 102 is a disc-shaped disc made of a glass plate, and a large number of visual acuity test indices such as visual acuity index are formed on the same circumference by chrome vapor deposition or the like. 103 is a target disc plate 102
Is a lighting lamp for illuminating a part of the above from the back side, and the examinee can see the visual target illuminated by the lighting lamp 103. Reference numeral 104 is a motor for rotating the target disc plate 102, and 105 is placed between the objective lens 101 and the target disc plate 102.
It is a cylindrical blocking wall for blocking ambient light.

Reference numeral 106 denotes an LED which emits infrared light. L
The infrared light flux from the ED 106 is bent upward by the half mirror 107. The infrared light flux that has been bent upward is generated by the objective lens 101 and the target disc plate 10.
It is made coaxial with the light flux of the illuminating lamp 103 by a beam splitter 108 placed between the two. The infrared light flux that is coaxial with the light flux of the illumination lamp 103 passes through the objective lens 101 and illuminates the subject's eye E to form a corneal reflection image bright spot on the cornea of the LED 106. The beam splitter 108 is one that reflects infrared light and transmits visible light.

The infrared light flux reflected on the cornea of the eye E to be examined is reflected by the beam splitter 108 via the objective lens 101. The infrared light flux reflected by the beam splitter 108 is a half mirror 107 and a condenser lens 109.
Then, the light is received by the light receiving element 110. As shown in FIG. 9A, the light receiving element 110 is composed of four-divided elements, and each element is separated by a constant width. Since the corneal reflection image bright spot is small, the reflected light is prevented from entering a plurality of elements.

A response button 120, a joystick 121, and a start / end button 122, which are used when the visual target cannot be discriminated, are provided on the lower portion of the exterior of the apparatus body 100, and the subject uses these response means. Take an inspection. Reference numeral 130 denotes a control unit that controls the entire apparatus, including the motor 104, the light receiving element 110, and the response button 12.
0, joystick 121, start / end button 1
22, the display unit 131 and the like are connected. Display unit 131
Is a liquid crystal touch panel similar to the display unit 22 shown in the first embodiment, and can display measurement results and perform various settings.

The examinee or examiner presses the start / end switch 122 to start the normal visual acuity measurement. The subject looks into the inside of the apparatus main body 1 and responds with the joystick 121 about the direction of the cut of the visual target presented inside. When the cut direction of the optotype is unknown, the response button 120 is pressed. The control unit 130 includes a joystick 121 and a response button 12
Based on the signal from 0, the motor 104 is driven to rotate the target disc plate 102, and the next target is presented to the subject. After the normal visual acuity value is obtained by performing such a process a plurality of times, the start / end button 1 is pressed again.
Press 22 to move to the practical vision measurement program.

The control unit 130 uses the start / end button 12
When the second signal from 2 is sent, the visual target having the visual acuity value of the subject obtained by the normal visual acuity measurement is presented to the subject as the first presentation visual target in the practical visual acuity measurement. At the same time, the amount of light received by the light receiving element 110 (the amount of light reflected from the cornea) at the start of the practical visual acuity test is stored. The control unit 130 measures the practical visual acuity based on the flowchart of FIG. 3 as in the first embodiment.

When the subject blinks during the practical visual acuity test, the reflected light flux of infrared light striking the eyelid enters the light receiving element 110. At this time, in the light receiving element 110, as shown in FIG. 9B, the reflected light is incident on almost the entire area of the four-divided element. As a result, a signal different from the signal when the subject's eyes are open is sent from the light receiving element 110 to the control unit 130. The control unit 130 detects that the eyelid of the subject is closed based on the change in the signal from the light receiving element 110, and ends the practical visual acuity test. The control unit 130 uses the visual acuity value of the final presented optotype as the visual acuity value of the subject in the practical visual acuity.
The result is displayed in 1.

<Embodiment 3> In the above embodiments, a device for measuring visual acuity is used, but the device is not limited to this.
As a third embodiment, a case where a general-purpose personal computer (hereinafter referred to as PC) is used will be described. FIG. 10 is a diagram showing the configuration of a visual acuity test system using a general-purpose PC. 200 is a general-purpose PC. The PC 200 is a main body 20 including a hard disk for storing data, a CPU, a communication unit for connecting to the Internet, and the like.
1, keyboard 202, mouse 203, display 2
It consists of 04 mag.

Reference numeral 210 is a server in which an execution program for measuring the normal visual acuity and the practical visual acuity is stored, and also serves as a provider (base station). A communication line network 220 uses the Internet in this embodiment. The subject uses the PC 200 to access the home page set up by the server 210 and displays the server 210 on the display 204 of the PC 200.
Display the homepage launched by. On the homepage, an execution button for executing the program for measuring visual acuity is prepared, and the subject places the cursor on the execution button with a mouse or the like and clicks it.

When the execute button is pressed, the server 210 activates a stored execution program for measuring visual acuity, displays a window 205 for various settings on the display 204, and displays a voice guide or screen display. The examinee is instructed on the operation procedure (see FIG. 11). The size of the display (1
5 inches, 17 inches, 19 inches), resolution (640 x 4)
80, 800 x 600, 1024 x 768) and a column for selecting the distance between the subject and the display (50 cm, 1 m, 2 m, 3 m, 5 m) are provided, and the subject is displayed here. Various settings can be made by clicking the radio button. After the subject has made various selections in the window 205,
Click the OK button displayed in the window 205.

When the OK button is pressed, the server 210 causes the corresponding visual target to be presented on the display 204 based on the information selected in the window 205, and the normal visual acuity measurement is started. The subject determines the break direction of the presented optotype using the up, down, left, and right arrow keys provided on the keyboard 202, and transmits the response to the server 210. Server 2
10 sequentially presents various visual targets to the subject according to a program for measuring normal visual acuity similar to the above example according to the content of the response from the subject, and measures the visual acuity value of the subject. When the normal visual acuity value of the subject is determined, the server 210
Displays that fact on the display 204, and ends the measurement of normal visual acuity.

Next, the subject presses the "Enter" key on the keyboard 202 according to the voice guide or the screen display,
Move on to the measurement of practical eyesight. When the “Enter” key is pressed, the server 210 causes the display 204 to display the visual target having the visual acuity value of the subject obtained by the normal visual acuity measurement as the first presented visual target for the practical visual acuity measurement. The examinee responds with the up, down, left, and right arrow keys as in normal visual acuity measurement.

The practical visual acuity measurement is also performed based on the practical visual acuity measurement program shown in the flowchart of FIG. 3 shown in the first embodiment. After blinking, the subject presses the space key on the keyboard 202 by himself / herself.
When the space key is pressed, the server 210 ends the execution program for the practical visual acuity measurement, and displays the final visual acuity value of the visual target on the display as the practical visual acuity of the subject.

As described above, it is possible to easily perform practical visual acuity measurement without using a device dedicated to visual acuity measurement. In addition, the distance between the display 204 and the subject is 3 m or 5 m
When it is used separately from the keyboard, the keyboard operation may be performed by wireless communication such as infrared communication.

Further, in the present embodiment, the program for visual acuity measurement (visual acuity test) is executed on the server 210, but the present invention is not limited to this, and the program for visual acuity test is downloaded from the server 210 to the PC 200. ,
It is also possible to measure the visual acuity only with the PC 200 without using the server 210.

Further, in addition to using a general-purpose PC, it is also possible to measure a practical visual acuity by using a communication terminal having an internet connection function. FIG. 12 is a diagram showing a schematic external view of a mobile phone having an Internet connection function.

Reference numeral 300 is a mobile phone. The subject connects to the Internet using a mobile phone and downloads a program for a practical visual acuity test from the server 210 shown in FIG. The subject holds the mobile phone, holds it so that the screen 301 of the mobile phone can be seen at a position where the arm is extended, and measures the distance from the subject's eye to the screen 301 with a measure or the like.

The subject executes the downloaded program for measuring practical eyesight, and indicates the distance from the subject's eye to the mobile phone 300 measured in advance on the setting screen and the eyesight value of the subject as a telephone number. Button group 3 used when inputting etc.
Enter with 02. C built into the mobile phone 300
The control unit including a PU or the like calculates a target of the size of a Landolt ring corresponding to the distance input by the button group 302 based on a program for measuring practical visual acuity, and displays the target on the screen 301.

The subject holds the mobile phone 300 with his arms fully extended, and starts the practical visual acuity measurement using the button 303 on the mobile phone 300. Mobile phone 3 to identify the target
00 using the cross key 304 provided on the screen. Also,
The procedure of measuring the actual visual acuity is performed based on the flowchart of FIG. 3 shown in the first embodiment. When the subject blinks, the subject presses the button 305 provided on the mobile phone 300 to finish the practical visual acuity measurement.

When the measurement is completed, the control unit in the mobile phone 300 displays the measurement date and time, the measurement result, the measurement distance, etc. on the screen 301 according to the program. Further, the subject presses the button 305 and sends the result to the server 310. The server 310 stores the data sent together with the subject's email address in the server 310. The visual acuity value data stored in this way is connected to the Internet using a mobile phone or the like at a later date, and accessed on the home page set up by the server 310 to show the past visual acuity value change state as a numerical value or a graph. It can be seen at.

Further, in the embodiment using the mobile phone, only the practical visual acuity meter is measured, but a normal visual acuity test may be performed as in the other embodiments.

[0056]

As described above, according to the present invention, it is possible to easily measure a practical visual acuity value of a subject in the time from the start of measurement to the blinking. Further, by using a communication line such as the Internet, it is possible to easily perform practical visual acuity measurement with a general-purpose personal computer or mobile phone.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a visual acuity test device used in the present embodiment.

FIG. 2 is a schematic diagram showing an optical system and a control system of the visual acuity test device.

FIG. 3 is a flowchart showing a procedure of a visual acuity test.

FIG. 4 is a diagram showing an operation screen for performing a normal visual acuity test.

FIG. 5 is a diagram showing an operation screen for performing a practical visual acuity test.

FIG. 6 is a diagram showing details of a print result.

FIG. 7 is a diagram showing an operation screen for performing mode setting.

FIG. 8 is a diagram showing a peep-type visual acuity test device to which the present invention has been applied.

FIG. 9 is a diagram showing a configuration of a light receiving element.

FIG. 10 is a diagram illustrating a configuration of a visual acuity test system using a general-purpose personal computer.

FIG. 11 is a diagram showing a setting screen for performing a visual acuity test.

FIG. 12 is a diagram showing a functional configuration of a mobile phone to which the present invention has been applied.

[Explanation of symbols]

1 device body 10 Target presentation section 11 concave mirror 12 Beam splitter 20 control box 21 Operation part 22 Display 23 Output section 24 Control unit 30 Response Box 31 Joystick 32 response button 33 Start button

Claims (9)

[Claims] 1. An index presenting means for sequentially presenting a visual acuity test index to a subject, an input means for inputting a response of the subject, and a determining means for determining whether the input response is correct or incorrect, In a visual acuity test device for inspecting the visual acuity of a subject, a mode for switching from a normal visual acuity test mode for measuring a normal visual acuity of an eye to a practical visual acuity test mode for measuring a visual acuity change of an eye to be inspected during continuous eyelid opening. -The switching means and the visual target of the visual acuity value corresponding to the normal visual acuity value of the eye to be examined are first presented to start the test, and when the response of the subject does not satisfy the predetermined standard, the lower visual acuity value An optotype presenting program for presenting optotypes and a practical visual acuity test mode.
A visual acuity test device, comprising: a measurement result storage unit that stores the measurement result at the time of operation together with the time axis. 2. An optotype presenting means for sequentially presenting the visual acuity test optotypes to the subject, an inputting means for inputting the response of the subject, and a determining means for determining whether the input response is correct or incorrect, In a visual acuity test device for inspecting the visual acuity of a subject, a mode switching means for switching to a practical visual acuity test mode for measuring a visual acuity change of an eye to be inspected when the eyelids are maintained, and a normal visual acuity value of the eye to be inspected Start the examination by first presenting the optotype with the visual acuity value, and the optotype presenting program that presents the optotype with the lower visual acuity value when the response of the subject does not satisfy the predetermined criterion, and A visual acuity comprising: a program ending means for detecting the eyelid state and ending the optotype presenting program when there is a blink; and a measurement result storage means for storing a measurement result in a practical visual acuity test mode. Inspection device. 3. The visual acuity test apparatus according to claim 2, wherein the program terminating means has an optical detecting means for optically detecting an open eyelid state of an eye to be inspected. 4. The visual acuity test apparatus according to claim 1 or 2, further comprising a time changing unit that changes a predetermined presentation time of the presenting target. 5. The visual acuity test apparatus according to claim 1 or 2, wherein the visual acuity value changing step to be reduced when the correct answer to the presented optotype does not satisfy a predetermined criterion is changed to one step or a plurality of steps. A visual acuity test device comprising: a visual acuity value changing step changing means. 6. A communication terminal having a presentation screen for presenting an optotype having a predetermined visual acuity value and a response means for making a response of the subject to the presented optotype, and the communication terminal and a communication network. A server connected via, a server for recording an optotype presenting program for visual acuity measurement for changing the presenting of the optotype according to the response result to the presented optotype, the communication terminal to the server. A visual acuity test system which accesses and executes the optotype presenting program to sequentially present optotypes on the presentation screen to perform visual acuity measurement. 7. The visual acuity test system according to claim 6,
The optotype presenting program presents an optotype at the same visual acuity level when the correct answer to the presented optotype meets a predetermined criterion, and when the correct answer to the presented optotype does not meet the predetermined criterion, A visual acuity test system comprising the step of presenting a target at a visual acuity value lower than the visual acuity value. 8. The visual acuity test system according to claim 7,
The communication terminal has an input unit for inputting a distance between the presentation screen and an eye to be inspected, and the optotype presenting program determines a size of an optotype presented on the presentation screen based on the input distance. A visual acuity test system including the step of: 9. The visual acuity test system according to claim 8, wherein a general-purpose personal computer or a mobile phone is used as the communication terminal.