JP2001309887A - Method of measuring visual acuity and measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for measuring practical visual acuity and a measuring method which is compact, does not need big room to have the system, and takes a propensity of reduction of visual acuity due to staring at a chart into consideration. SOLUTION: A method of measuring practical visual acuity includes the following steps: A displaying step 105 displays marks. A step 106 for receiving answers receives an answer input by an examinee. A determining step 108 determines if the answer is right or wrong. A step repeats the displaying step and the step for receiving answers plural times. A step 114 for displaying a result displays a result obtained after the measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for measuring visual acuity. More specifically, the present invention relates to a practical visual acuity measuring system using a computer.

[0002]

2. Description of the Related Art A conventional visual acuity measuring device is for measuring visual acuity at a certain time at that time. In addition, the conventional visual acuity measuring device recognizes the target mark using a landmark ring, an E mark, a hiragana, a katakana, or the like at a position about 5 m away from a position where the subject is standing. The measurer manually measured whether or not he could do it. In addition, it is easy to measure other visual acuity such as color blindness which is lack of color vision, contrast visual acuity to recognize color density, moving visual acuity to recognize a moving object, and visual acuity to recognize flicker phenomenon which is a blink of light. No way was provided. Further, there is no means for urging a person engaged in a computer to issue a warning for preventing a decrease in visual acuity. For this reason, many computer workers stare at the computer display for a long time without blinking, resulting in dry eye and reduced vision.

[0003]

SUMMARY OF THE INVENTION Vision deteriorates with continued use of the eye. After staring at a book or video screen for a period of time without blinking, the eyesight drops sharply by a person. For example, if you stare without blinking while driving on a highway, there is a risk that your vision may be reduced.

[0004] In such a case, the drop in visual acuity may drop from about 1.0 to about 0.3 depending on the person, even in normal cases. It has been found that this tendency is more likely to occur in the eyes of the so-called dry eye, which tends to dry the eyeball surface. FIG. 2 shows a typical example of the results of measuring the visual acuity of an individual with a dry eye tendency, with the horizontal axis representing the fixation time and the vertical axis representing the visual acuity. Point M in FIG. 2 indicates a situation in which visual acuity is restored due to blinking or the like.

As described above, the visual acuity measured by the conventional visual acuity measuring device is different from the actual visual acuity when the eyes are stressed (hereinafter referred to as "practical visual acuity").
The differences can be quite large depending on the person and also on the environment and the degree of stress.

Further, the conventional optotype requires a space for installation such as mounting on a wall, and once mounted, it is inconvenient to move. For this reason, it has been practically limited to a specialty clinic such as an ophthalmologist or a special place such as an optician. Since the target is located only in a special place, it is practically difficult to make regular measurements such as daily measurement in daily life. For this reason, the subject tends to be late in recognizing the tendency of the eyesight to deteriorate when the eyesight tends to deteriorate,
Preventive measures such as changing to a lifestyle that does not burden the eyes were not possible. Thus, from the knowledge of preventive medicine,
There is a demand for a compact and space-free visual acuity measuring method and apparatus closely related to daily life that can be easily and easily measured on a daily basis.

As described above, practical visual acuity of each subject cannot be measured only by visual acuity at one time or moment. In addition, there is a need for a compact and space-saving measuring device that can be used at any time in daily life from the perspective of preventive medicine. Therefore, an object of the present invention is to provide a compact and space-saving method and system for measuring practical visual acuity in consideration of the tendency of visual acuity reduction due to staring. The present invention also provides color blindness, a lack of color vision,
It is also intended to provide a simple measurement method for measuring other visual acuity such as contrast visual acuity to recognize color density, moving visual acuity to recognize a moving object, flicker recognition to recognize flicker phenomenon that is blinking light And Another object of the present invention is to provide a method for prompting a computer worker, who tends to stare at a computer display without blinking and who tends to have dry eyes, to be warned to prevent a decrease in visual acuity.

[0008]

In order to achieve the above object, the present invention provides a display step of displaying a target mark.
5, a response receiving step 106 for receiving a response input by the subject in response thereto, a determining step 108 for determining whether the response is correct, and a step of repeating the display step, the response receiving step, and the determining step a plurality of times. And a result displaying step 114 for displaying a measurement result. Also provided is a computer-readable recording medium on which a program for executing this method is recorded. Optotype marks are marks used for measuring various visual acuity. For measurement of visual acuity, Landolt rings, E marks, Hiragana, Katakana, etc. are preferably used. Or, for color blindness measurement, if it is drawn with a dot plot consisting of various color points,
The form may be any number, hiragana, katakana, etc. For measurement of the contrast visual acuity, any form can be used as long as the density of the line flux is high and low. The form is not limited as long as it moves on the display for measuring the dynamic visual acuity. For visual acuity measurement for recognizing the flicker phenomenon, any mark can be used as long as the mark can change the blinking speed. The computer-readable recording medium is FD
(Floppy (registered trademark) disk), CD (compact disk), MD (mini disk) and other recording media, but are not limited as long as they can be read by a computer.

As another aspect of the present invention, a host computer 10 and a computer 1 of a subject connected to the host computer 10 by an electric communication line 11 are shown.
8, the host computer 10 transmits the optotype mark to the computer 18 of the person to be measured via the telecommunication line 11 to display the optotype mark on the computer display 15 of the person to be measured.
05 and a response receiving step 106 in which the host computer 10 receives a response input of the subject from the computer 18 of the subject via the telecommunication line 11 in response thereto.
A determination step 108 in which the host computer 10 determines whether or not the response is correct; a step of repeating the display step 105, the response reception step 106, and the determination step 108 a plurality of times; A result display step (111 to 11) of transmitting the measurement result to the computer 18 of the subject and displaying the measurement result on the computer display 15 of the subject.
And 4) a method for measuring practical vision. In addition, as another preferable embodiment, the computer of the subject is preferably the portable information terminal 12. Also provided is a computer-readable recording medium 19 on which a program for executing the method is recorded. The telecommunications line includes a wireless line such as a mobile phone, a telephone line, a digital line, an analog line, and the Internet connected by a TCP / IP protocol, and is not limited as long as it is a communication means used for transmitting and receiving data.

As another aspect of the present invention, a host computer 10 and a computer 1 of a subject connected to the host computer 10 by an electric communication line 11 are shown.
8. A system for measuring any one of the visual acuity selected from a group including color blindness, contrast visual acuity, and dynamic visual acuity, wherein the optotype mark is measured by the host computer 10 via the telecommunication line 11 in the system comprising: Displaying the optotype mark on the computer display 15 of the subject by transmitting the same to the computer 18 of the subject
05 and a response receiving step 206 of receiving a response input of the subject from the computer 18 of the subject to the host computer 10 via the telecommunication line 11 in response to the input.
A determination step 208 in which the host computer 10 makes a determination based on the response; the host computer compiles the measurement results, transmits the measurement results to the computer of the subject, and displays the measurement results on the computer display of the subject. A visual acuity measuring method including a result displaying step (212 to 215) for performing display. In addition, as another preferable embodiment, the computer of the subject is preferably the portable information terminal 12. Also provided is a computer-readable recording medium 19 on which a program for executing this method is recorded.

As another aspect according to the present invention, a host computer 10 and a computer 18 of a subject connected to the host computer 10 by an electric communication line 11 are shown.
In a system for measuring flicker recognition visual acuity, a target mark is transmitted from a host computer 10 to a computer 18 of a person to be measured via an electric communication line 11 and is displayed on a computer display 15 of the person to be measured. A display step 305 for displaying an optotype mark that flashes at a varying speed, and at a point in time at which the subject becomes unable to recognize the recognizable flashing of the optotype mark or at which point the non-recognizable flashing becomes recognizable. Is input from the computer 18 of the person under test to the telecommunication line 11.
Response receiving step 306 received by the host computer 10 via the PC, a blinking speed recording step 308 in which the host computer 10 records the blinking speed corresponding to the response input, the display step 305, the response receiving step 306, and the blinking speed A step of repeating the recording step 308 one or more times, the result of the host computer 10 summing up the measurement results, transmitting the measurement results to the computer 18 of the subject, and displaying the measurement results on the computer display 15 of the subject. Display step (309-312)
And a method for measuring flicker recognition visual acuity, comprising: Further, as another preferable embodiment, the computer 18 of the subject is preferably the portable information terminal 12. Also provided is a computer-readable recording medium 19 on which a program for executing this method is recorded.

According to another aspect of the present invention, in a system including a computer 18 of a person to be measured and a camera 20 connected to the computer 18 of the person to be measured, an image of the eyes of the person to be measured is obtained as a moving image. Step 404;
Step 405 of measuring the number of blinks based on the image
And step 408 of displaying the number of blinks and / or a message on the computer display of the subject based on the measured number of blinks. In addition, as another preferable embodiment, the computer of the subject is preferably the portable information terminal 12. Also provided is a computer-readable recording medium 19 on which a program for executing this method is recorded.

As another aspect according to the present invention, a host computer 10 and a computer 1 of a subject connected to the host computer 10 by an electric communication line 11 are shown.
8 and a camera 20 connected to the computer 18 of the subject, a step 404 of obtaining an image of the eye of the subject as a moving image, and a step of measuring the number of blinks based on the image. 405, displaying 408 the number of blinks and / or a message on the computer display of the subject based on the measured number of blinks, and inputting the subject's input to the display to the computer of the subject. And an input receiving step 411 received by the host computer 10 from the computer 18 via the telecommunication line 11, and the host computer 10 transmits information required by the subject to be measured regarding the input to the computer 1.
8 and the computer display 15 of the subject
And an information display step 412 for displaying information. In addition, as another preferable embodiment, the computer of the subject is preferably the portable information terminal 12. Also provided is a computer-readable recording medium 19 on which a program for executing this method is recorded.

As another aspect according to the present invention, a display means 4 for displaying an optotype mark, a response receiving means 7 for receiving an input of a response of the subject to the target mark, and a control of these two means to determine whether the response is correct or wrong. Practical visual acuity including a control means 6 for determining, a timer function 5 for setting the display means 4 and the response receiving means 7 to a measurement state for a set time, and a result display means 8 for displaying a measurement result. Provide a measurement system. Further, as one of other preferable embodiments, it is preferable that the time set in the timer function 5 is variable, and that time measurement is started by a measurement start button.
Further, as another preferred embodiment, the control means 6
However, it is also preferable to give a command of a target mark to be displayed next to the display means 8 by judging whether or not the response is correct. In another preferred embodiment, the display means preferably displays the lowest visual acuity among the measurement results.

According to another aspect of the present invention, the method comprises the steps of: setting an eyesight measurement time; repeating the eyesight measurement during the eyesight measurement time; and displaying the result of the eyesight measurement. And a method of measuring practical visual acuity.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1: Practical visual acuity measuring system] FIG. 1 is a conceptual configuration diagram of a practical visual acuity measuring system according to an embodiment of the present invention.
The optotype mark display section 4 as a display means for displaying the optotype mark is disposed inside the housing 1 so as to be visible. A joystick 7 as a response accepting means for the subject to respond to the display means, a control means 6 for controlling both means and judging the correctness of the response, the display means and the response input means for a set time And a liquid crystal display 8 for displaying the measurement result are provided inside and on the surface of the housing 1 as shown in FIG. The control means 6 is mainly composed of a computer and software operating on the computer, and is connected to the optotype mark display section 4, the joystick 7, the timer function 5, and the result display means 8, to judge whether the response is correct or not, and to perform measurement by the timer function. Maintain the state and calculate the measurement result. In addition, 5a is a measurement start button attached to the timer function 5. Around it, a setting dial 5b for changing the set time of the timer function 5 is provided.

Next, the procedure of measurement by this system will be described. The system according to this embodiment is not connected to a network in a stand-alone manner. A power switch (not shown) is turned on, and the subject looks into the optotype mark display section 4 from the eyepiece 2. Turn the setting dial 5b of the timer function 5 to a predetermined setting value, for example, 15 seconds, and press the measurement start button 5a, whereby the visual acuity measurement is started. The subject is displayed in the optotype mark display section 4
At the top, a target mark (for example, a mark with a notch in the ring indicating the opening direction) that is displayed one after another is stared at, and the joystick 7 answers. The control means 6 determines whether the response is correct or not, and determines a command for a target mark to be displayed next. When the response is correct, the display of the next smaller target mark is commanded, and when the response is incorrect, the display of the next larger target mark is commanded. In this way, for example, as shown in FIG. 2, the measurement is continuously performed every three seconds at the measurement points P0 to P4 until the set time of the timer function 5 has elapsed. The control unit 6 calculates, for example, a measurement value indicating the lowest visual acuity among the measurement results, and displays the result on the result display unit 8. This result indicates the practical visual acuity of the subject. The display of the target mark is repeatedly performed during the set time of the timer function 5. This display may be at regular intervals as described above, or may be based on the timing of the response by the joystick 7. In the latter case, the subject with a quick response can display the optotype mark every 2 seconds or less, and a highly accurate result can be obtained.

[Embodiment 2: Practical visual acuity measuring system using a computer or a portable information terminal] FIG. 3 is a schematic diagram showing a practical visual acuity measuring system using a computer or a portable information terminal according to another embodiment of the present invention. . Computer 18 or portable information terminal 12 as display means
Displays 13 and 15 indicate the target mark.
The target mark was a Landolt ring, E mark, Hiragana, Katakana, or the like. The response accepting means for inputting a response indicating that the subject has recognized and confirmed the optotype mark includes the mouse 17,
The keyboard 16 and the input unit 14 of the portable information terminal are used. The determination means for determining whether the response is correct is a software program on the host computer 10 connected via the Internet 11. The timer function for setting the display unit and the response accepting unit to the measurement state during the set measurement time can be realized as a software program running on the host computer 10 connected to the Internet. As the result display means for displaying the measurement results, the computer 18 or the displays 13 and 15 of the portable information terminal 12 are used.

The measuring method by this system in the flowchart of FIG. 4 will be described. The subject connects to a prescribed website from the computer 18 or the portable information terminal 12 by a connection method of the Internet protocol of the Internet. The subject requests the source computer in a format such as HTML from the host computer 10 of the prescribed website, and causes the input screen for the initial measurement of the practical visual acuity measurement to be transferred to the subject's computer (steps 101 to 10).
2). Input the measurement input value on the input screen (Step 1
03). The input values include, for example, “the size of the display of the person to be measured”, “the distance from the eye of the person to be measured to the display”, “set time of the timer function (measurement time)”, and the like. This may be done by inputting a numerical value from a keyboard, or by selecting from several tables. It is also possible to set a fixed value. This input value is transmitted to the host computer 10 and stored (step 104). Next, click the measurement start button. As a result, the optotype mark starts to be displayed on the displays 13 and 15 of the subject, and the eyesight measurement is started (step 105).

The subject gazes at the optotype mark displayed on the displays 13 and 15, and inputs a response using the keyboard 16 or mouse 17 and the portable information terminal input unit 14. This response is transmitted to the host computer 10 via the Internet. This host computer 1
The determination means on 0 determines whether the response is correct or not, and determines a command for a target mark to be displayed next on the displays 13 and 15 (step 108). If the response is correct, the display of the next smaller target mark is commanded, and if the response is incorrect, the display of the next larger target mark is commanded (step 109).
To 110). As shown in FIG. 2, for example, P0 every three seconds
At the measurement points P4 to P4, the measurement is performed until the set time of the timer function has passed. The control means, for example, totals the measurement results that are the response data, and totals the measured values of the visual acuity indicating the lowest visual acuity among them. The measurement result of the visual acuity is displayed on the displays 13 and 15 which are the result display means. Alternatively, the first few measurement results are excluded, and the measurement value indicating the lowest visual acuity is selected from the measurement results in the latter half of the set period, and the result is displayed as a practical value on the displays 13 and 15 (steps). 111-114).
This result indicates the practical visual acuity of the subject.
The display of the target mark is repeatedly performed during the set time of the timer function. This display may be at regular intervals as described above, or may be based on the timing of the response by the response receiving means. In the latter case, the subject who responds quickly has 2
The optotype mark can be displayed every second or less, and accurate results can be obtained.

[Embodiment 3: Color blindness measurement system using a computer or a portable information terminal] FIG. 3 is a schematic diagram showing a practical visual acuity measurement system using a computer or a portable information terminal as another embodiment according to the present invention. . The display 13 or 15 of the computer 18 or the portable information terminal 12 as a display means displays an optotype mark. The optotype mark is drawn by dot drawing composed of dots of various colors for color blindness measurement, and numbers, hiragana, katakana, and the like are used. The mouse 17, the keyboard 16, and the input unit 14 of the portable information terminal are used as response accepting means for inputting a response that the subject has recognized and confirmed the optotype mark. The determination means for determining whether the response is correct is a software program on the host computer 10 connected via the Internet 11. During the set measurement time,
The timer function for setting the display unit and the response receiving unit in the measurement state can be realized as a software program that operates on the host computer 10 connected to the Internet. The result display means for displaying the measurement result is the computer 18 or the portable information terminal 12 described above.
Are used.

The measuring method by this system in the flowchart of FIG. 5 will be described. The subject connects to a prescribed website from the computer 18 or the portable information terminal 12 by a connection method of the Internet protocol of the Internet. The subject requests the source computer in a format such as HTML from the host computer 10 of the prescribed website, and causes the input screen for the initial measurement of practical visual acuity measurement to be transferred to the subject's computer (steps 201 to 20).
2). Input the measurement input value on the input screen (Step 2
03). The input value is, for example, “the size of the display of the person to be measured”, “the number of times the timer function is set (the number of times of measurement)”, and the like. This may be done by inputting a numerical value from a keyboard, or by selecting from several tables. It is also possible to set a fixed value. This input value is transmitted to the host computer 10 and stored (step 204). Next, click the measurement start button. As a result, the optotype mark starts to be displayed on the displays 13 and 15 of the subject, and the eyesight measurement is started (step 205). The subject gazes at the optotype mark displayed on the displays 13 and 15, and inputs a response using the keyboard 16 or the mouse 17 and the portable information terminal input unit 14.

This response is transmitted to the host computer 10 via the Internet. The determination means on the host computer 10 determines the content of the response, and determines a command for a target mark to be displayed next on the displays 13 and 15 (step 208). For example, when the response matches the expected answer, the number of correct answers is counted, and when the answer does not match, the number of incorrect answers is counted (steps 209 and 211). The measurement results as these response data are totaled, and it is determined whether or not the subject is color blind (steps 212 to 213). The host computer 10 transmits the result of color blindness to the computer 18 of the subject and displays it on the displays 13 and 15 which are the result display means (steps 214 to 2).
15). The display of the target mark is repeatedly performed during the set number of times of the timer function. This display may be at regular intervals as described above, or may be based on the timing of the response by the response receiving means. Also, without setting the number of measurements,
When it is determined that sufficient information about color blindness has been obtained, the display of the optotype mark can be stopped.

[Embodiment 4: Contrast visual acuity measuring system using a computer or a portable information terminal] As another embodiment according to the present invention, a contrast visual acuity measuring system using a computer or a portable information terminal will be described. The configuration and measuring method of the contrast visual acuity measuring system are the same as those of the third embodiment except that the target mark is changed for contrast. An optotype mark for contrast visual acuity measurement having a density of a line flux was used.

[Embodiment 5: Moving object visual acuity measuring system using computer or portable information terminal] As another embodiment according to the present invention, a moving object visual acuity measuring system using a computer or portable information terminal will be described. The configuration and the measuring method of the moving object visual acuity measuring system are the same as those of the third embodiment except that the target mark is changed for measuring the moving object visual acuity. An optotype mark for moving visual acuity measurement that moves on a display was used.

[Embodiment 6: A flicker recognition visual acuity measuring system using a computer or a portable information terminal] FIG.
FIG. 9 is a schematic diagram showing a computer or a portable information terminal-based flicker recognition visual acuity measuring system as another embodiment according to the present invention. The display 13 or 15 of the computer 18 or the portable information terminal 12 as a display means displays an optotype mark. The target mark used was a mark whose blinking speed changes for flicker recognition visual acuity measurement. The response accepting means for inputting a response at the point where the subject becomes unable to recognize the blinking that the target mark can be recognized or becomes able to recognize the blinking that cannot be recognized is the mouse 1.
7, a keyboard 16 and an input unit 14 of a portable information terminal are used. Flashing speed when responding (flicker recognition speed)
Is a software program on the host computer 10 connected to the Internet 11. For a set number of measurements, a timer function that sets the display unit and the response reception unit to a measurement state,
It can be realized as a software program running on the host computer 10 connected to the Internet. As the result display means for displaying the measurement results, the computer 18 or the displays 13 and 15 of the portable information terminal 12 are used.

The measuring method by this system in the flowchart of FIG. 6 will be described. The subject connects to a prescribed website from the computer 18 or the portable information terminal 12 by a connection method of the Internet protocol of the Internet. The subject requests the source computer in a format such as HTML from the host computer 10 of the prescribed website, and causes the input screen for initial measurement of flicker recognition visual acuity measurement to be transferred to the subject's computer (step 3).
01-302). An input value for measurement is input on the input screen (step 303). This input value is, for example, “the size of the display of the person to be measured”, “set time of the timer function (measurement time)”, and the like. This may be done by inputting a numerical value from a keyboard, or by selecting from several tables. It is also possible to set a fixed value. This input value is transmitted to the host computer 10 and stored (step 304). Next, click the measurement start button. As a result, the target mark starts to be displayed on the displays 13 and 15 of the subject, and the flicker recognition visual acuity measurement is started (step 30).
5). The subject gazes at the optotype mark displayed on the displays 13 and 15 and uses the keyboard 16 or the mouse 1.
7. The mobile information terminal input unit 14 inputs, as a response, a point at which recognized blinking cannot be recognized or a point at which unrecognized blinking can be recognized. This response is sent to the host computer 10 via the Internet.
(Step 306). The host computer counts and records the blinking (flicker) speed when responding (step 308). The display of the optotype mark is repeated once or more during the set number of times of the timer function. This display may be performed at regular time intervals or according to the timing of the response by the response receiving unit.

[Embodiment 7: Visual acuity reduction prevention system] FIG.
FIG. 3 is a schematic diagram showing a vision-loss prevention system as another embodiment according to the present invention. There is a computer 18 as a message display means and a camera 20 connected to the computer. If you work for a long time while working at a computer, you tend to stare at the display and reduce the number of blinks. For this reason, the symptoms of dry eye are likely to occur. In the seventh embodiment, when the number of blinks is reduced by the camera from the prescribed number of times per unit time, a warning message such as a notification of a tendency of deterioration of the eyesight of the subject or a check of lifestyle related to eyes, an appropriate eye drop, etc. To display on the display a message promoting the eyesight correction product. This warning message displays a message such as “Let your eyes rest!” On the display. A mark display may be displayed on the display that promotes the action of stretching the muscles of the eyes as if looking at a distant place without deteriorating the visual acuity. In addition, "Do you watch TV or books nearby?"
Or a message such as "What is the brightness of the room?"

A method for preventing a decrease in visual acuity by this system will be described with reference to the flowchart of FIG. The subject inputs an input value such as the number of blinks in a normal state on an input screen displayed on the display 15 of the computer 18 (step 401). This input value is, for example, “age” in addition to “the number of blinks in normal times”. This may be done by inputting a numerical value from a keyboard, or by selecting from several tables. It is also possible to set a fixed value. Based on this input value, the number of warning blinks is calculated by the computer 18 of the subject using a prescribed calculation formula and stored (step 402). The subject measures the direction and focus of the camera so that a blink of an eye can be captured. Next, a measurement start button displayed on the display is clicked, and an image of an eye is taken by a camera to obtain a moving image (step 404). Measurement is started based on this moving image (step 405). When the measured number of blinks is equal to or less than the warning number, the warning message is displayed on the display 15 of the subject (step 408). This warning message, as mentioned earlier,
A message such as "Let your eyes rest!" Is displayed on the display. When displaying the warning message, the number of blinks may be displayed simultaneously. Also, the display of the number of blinks may be always independently displayed on the display regardless of the number of blinks (even if no warning message is displayed).

When a warning message screen is displayed,
In accordance with the number of blinks of the subject, prescription information relating to improvement of lifestyle related to eyes, appropriate vision correction, and introduction of products for preventing vision loss can be received. The data relating to the prescription information may be stored in advance in the computer 18 of the subject, but in this embodiment, it is assumed that the data is stored in the host computer 10 in order to facilitate updating. The subject requests the host computer 10 for the source data of the prescription information via the Internet 11. In response to this request, the prescription information screen is transferred to the computer of the subject. As a result,
The prescription information is displayed on the display 15 of the subject (step 412).

Although not shown, another embodiment of the present invention will be described below. The presentation means for presenting the optotype mark may be composed of a large screen and a projector. In this case, the target mark is projected from the projector onto the screen, and the projector is connected to the control means. The subject gazes at the optotype mark on the screen, and answers using response input means such as a joystick or keyboard.
The target mark displayed on the display is not limited to a conventional Landolt ring, E mark, Hiragana, Katakana, etc., but may be any mark indicating a direction such as up, down, left, or right, such as an animated character or a traffic sign. In a car circuit game or the like, the subject may play a role of a driver, and the game may be used to test a dynamic visual acuity such as a traffic sign appearing ahead of a road in the game. The response accepting means is not limited to the keyboard, mouse, and portable information terminal input unit connected to the computer,
An optical communication input device such as a joystick or a cordless mouse for giving a response may be used. The control means and the program having the timer function of the set time are not only software programs on a website connected to the Internet, but also a computer-readable recording medium recording a program such as a CD-ROM or a DVD. Above, you may distribute as novelty goods such as ophthalmology and optician. Further, there may be a function of displaying a time-series diagram of the measurement result or printing out the result by periodically performing the measurement and leaving the result on a recording medium such as a website or a user's hard disk. Further, the data may be processed so that this timeline can be used at the time of an interview with an ophthalmologist.

[0032]

As described above, if the practical visual acuity measuring system of the present invention is provided, a timer function for repeatedly setting a measuring time is provided to take into account the tendency of visual acuity deterioration due to staring, and the space is smaller than that of the conventional apparatus. Is also unnecessary, and practical vision can now be measured. In addition, practical visual acuity measurement, color blindness measurement, contrast visual acuity measurement, dynamic visual acuity measurement, and flicker recognition visual acuity measurement can be performed on a computer or a portable information terminal. In addition, by measuring the number of blinks related to eye fatigue due to computer work, the subject can be made aware of the need to take a break.

[Brief description of the drawings]

FIG. 1 is a conceptual configuration diagram of a practical visual acuity measuring system as one embodiment according to the present invention.

FIG. 2 is a diagram showing a typical example of a result of eyesight measurement of an individual having a tendency to dry eye.

FIG. 3 is a conceptual configuration diagram of a practical visual acuity measuring system as one embodiment according to the present invention.

FIG. 4 is a flowchart showing a practical visual acuity measuring method using a computer or a portable information terminal as one embodiment of the present invention.

FIG. 5 is a flowchart illustrating a method for measuring visual acuity such as color blindness, contrast visual acuity, and dynamic visual acuity using a computer or a portable information terminal according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating a flicker recognition visual acuity measuring method using a computer or a portable information terminal according to an embodiment of the present invention.

FIG. 7 is a flowchart showing a method for preventing vision loss by a computer as one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Eyepiece 3 Mirror 4 Optotype mark display part (presentation means) 5 Timer 5a Measurement start button 5b Setting dial 6 Control means 7 Joystick 8 Result display means P0-P4 Measurement point M The situation where visual acuity is restored by blinking 10 Host computer 11 Internet 12 Portable information terminal 13 Display (display screen) 14 Input unit 15 Display 16 Keyboard 17 Mouse 18 Computer body 19 Recording medium 20 Camera

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06F 17/60 506 A61B 3/10 Z

Claims (16)

[Claims] A display step of displaying an optotype mark; a response receiving step of receiving a response input of the subject in response to the target mark; a determining step of determining whether the response is correct; A method for measuring practical visual acuity, comprising: a step of repeating the determining step a plurality of times; and a result displaying step of displaying a measurement result. 2. A system comprising a host computer and a computer of a subject connected to the host computer via a telecommunication line, wherein the host computer transmits the optotype mark to the computer of the subject via the telecommunication line. A display step of displaying an optotype mark on the computer display of the subject; and a response receiving step of receiving the response input of the subject from the host computer via the telecommunication line from the computer of the subject. A determination step in which the host computer determines whether the response is correct; and a step in which the display step, the response reception step, and the determination step are repeated a plurality of times. Send the measurement results to the person's computer Method for measuring visual acuity, including a result display step for displaying the measurement result display. 3. The visual acuity measuring method according to claim 2, wherein the computer of the subject is a portable information terminal. 4. A system comprising a host computer and a computer of a subject connected to the host computer by an electric communication line, wherein any one of a group including color blindness, contrast vision, and moving body vision is selected. A step of transmitting the optotype mark to the computer of the subject via a telecommunication line to display the optotype mark on the computer display of the test subject; A response receiving step of receiving a response input of the measurer from the computer of the person to be measured to the host computer via the telecommunication line; a determination step in which the host computer makes a determination based on the response; Aggregate and send the measurement results to the person's computer Vision measuring method comprising the result display step for displaying the measurement results on subject's computer display. 5. The visual acuity measuring method according to claim 4, wherein the computer of the subject is a portable information terminal. 6. A system comprising a host computer and a computer of a subject connected to the host computer via a telecommunication line, wherein the host computer transmits the optotype mark to the computer of the subject via a telecommunication line. A display step of displaying a target mark that blinks at a changing speed on a computer display of the subject; and a point in time at which the subject becomes unable to recognize or does not recognize the flashing of the target mark. A response input step in which the host computer receives a response input at the time when it becomes possible to recognize the response from the computer of the subject via a telecommunication line, and the host computer records a blinking speed corresponding to the above response input Blinking speed recording step, and the above display step and response receiving step A step of repeating the flashing speed recording step at least once and a result displaying step in which the host computer totals the measurement results, transmits the measurement results to the subject's computer, and displays the measurement results on the subject's computer display. And a method for measuring flicker recognition visual acuity. 7. The visual acuity measuring method according to claim 6, wherein the computer of the subject is a portable information terminal. 8. A system comprising: a computer of the subject; and a camera connected to the computer of the subject. A step of obtaining an image of the eye of the subject as a moving image; A method for preventing a decrease in visual acuity, comprising a step of measuring the number of blinks and a step of displaying the number of blinks and / or a message on a computer display of the subject based on the measured number of blinks. 9. A system comprising: a host computer; a computer of a subject connected to the host computer via a telecommunication line; and a camera connected to the computer of the subject. Obtaining an image as a moving image; measuring the number of blinks based on the image; displaying the number of blinks and / or a message on a computer display of the subject based on the measured number of blinks An input receiving step in which the host computer receives an input of the subject to the display from the computer of the subject via the telecommunication line from the computer of the subject; and the host computer measures information required by the subject regarding the input. To the computer of the patient and displays the information on the computer display of the subject. Method for preventing vision loss including the information display step for displaying. 10. The visual acuity measuring method according to claim 8, wherein the computer of the subject is a portable information terminal. 11. A computer-readable recording medium on which a program for executing the method according to claim 1 is recorded. 12. A display means for displaying an optotype mark, a response receiving means for receiving an input of a response of the subject to the mark, a control means for controlling the two means and determining whether the response is correct or incorrect. A practical visual acuity measuring system comprising: a timer function for setting the display means and the response receiving means to a measurement state for a time; and a result display means for displaying a measurement result. 13. The practical visual acuity measurement system according to claim 12, wherein the time for which the timer function is set is variable, and time measurement is started by a measurement start button. 14. The practical visual acuity measuring system according to claim 12, wherein said control means gives a command of an optotype mark to be displayed next to said display means based on a judgment of correctness of the response. . 15. The apparatus according to claim 12, wherein said display means displays the lowest visual acuity among the measurement results.
The visual acuity measuring system according to any one of the above. 16. A method for measuring practical visual acuity, comprising: setting a visual acuity measuring time; repeating visual acuity measurement during the visual acuity measuring time; and displaying a result of the visual acuity measurement. .