JP4638007B2 - Visual acuity measurement method and measurement system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a visual acuity measurement method and measurement system. More specifically, the present invention relates to a practical visual acuity measurement system using a computer.
[0002]
[Prior art]
The conventional visual acuity measuring instrument is for measuring visual acuity at a certain time. In addition, the conventional visual acuity measuring device recognizes the target mark by using a target mark on which a Landolt ring, E mark, Hiragana, Katakana, etc. are written at a position about 5 m away from the standing position of the subject. Depending on whether or not it was possible, the measurer was measuring manually.
It is also easy to measure other visual acuity such as color blindness, lack of color vision, contrast visual acuity to recognize color density, moving visual acuity to recognize moving objects, visual acuity to recognize flicker phenomenon, which is blinking light. No way was provided.
In addition, there was no means for prompting a person engaged in a computer to warn to prevent a decrease in visual acuity. For this reason, many computer workers stared at the computer display for a long time without blinking, resulting in dry eyes and a decrease in visual acuity.
[0003]
[Problems to be solved by the invention]
Visual acuity falls with continued use of the eyes. The visual acuity after staring at a book or video screen for a certain amount of time without blinking drops rapidly by the person. For example, when driving on a highway, staring without blinking may be accompanied by a risk of vision loss.
[0004]
Even in such a case, the reduction in visual acuity at this time may fall from about 1.0 to about 0.3 depending on the person. It is known that this tendency is often found in the owner of the eye so-called dry eye, which tends to dry the surface of the eyeball. FIG. 2 shows a typical example of a visual acuity measurement result of an individual with a dry eye tendency, with gaze time as the horizontal axis and visual acuity as the vertical axis. The point M in FIG. 2 indicates a situation in which the visual acuity is restored by blinking or the like.
[0005]
In this way, the visual acuity measured by a conventional visual acuity measuring instrument and the actual visual acuity when the eye is stressed (hereinafter referred to as “practical visual acuity”) are different, and the difference is different depending on the person and the environment. Depending on the level of stress and stress, it can be quite large.
[0006]
Further, the conventional visual target requires a space for installation, such as being attached to a wall, and once installed, it is inconvenient to move. For this reason, it was practically limited to special places such as specialist clinics such as ophthalmologists and spectacle stores. Since the target is only in a special place, regular measurement such as daily measurement in daily life is practically difficult. For this reason, the subject was apt to be late in recognizing his / her visual acuity tendency when he / she was in a visual aggravation tendency, and it was not possible to prevent in advance such as changing to a lifestyle that does not burden the eyes. Thus, from the perspective of preventive medicine, a compact and space-saving visual acuity measurement method and apparatus closely related to daily life that can be easily measured on a daily basis is desired.
[0007]
As described above, the practical visual acuity of each person to be measured cannot be measured with only a visual acuity or instantaneous visual acuity. In addition, a compact and space-saving measuring device that can be used anytime in daily life is also necessary from the perspective of preventive medicine. Accordingly, an object of the present invention is to provide a method and a measurement system for measuring practical visual acuity that is compact and does not require a space in consideration of a tendency of visual acuity reduction due to gaze.
The present invention also provides other visual acuity such as color blindness that lacks color vision, contrast visual acuity that recognizes color density, dynamic visual acuity that recognizes moving objects, and flicker recognition visual acuity that recognizes flicker phenomenon that is blinking light. Another object is to provide a measurement method that is simple to measure.
It is another object of the present invention to provide a method for urging a computer worker who tends to stare at a computer display without blinking and is prone to dry eyes to prevent a reduction in visual acuity.
[0008]
In order to achieve the above object, the present invention includes a display step 105 for displaying an optotype mark, a response receiving step 106 for receiving a response input from the person to be measured, and a determination step 108 for determining whether the response is correct. And a visual acuity measurement method including a step of repeating the display step, the response reception step, and the determination step a plurality of times, and a result display step 114 for displaying the measurement result. A computer-readable recording medium on which a program for executing this method is recorded is also provided.
An optotype mark is a mark used to measure various visual acuities. For the measurement of visual acuity, a Landolt ring, E mark, hiragana, katakana and the like are preferably used. Alternatively, for color blindness measurement, numbers, hiragana, katakana, etc. may be used as long as they are drawn by point drawing composed of various color points. For the measurement of contrast visual acuity, any form can be used as long as the density of the line bundle is high or low. The form for moving eyesight measurement is not limited as long as it moves on the display. For visual acuity measurement for recognizing the flicker phenomenon, any mark can be used as long as it can change the blinking speed.
The computer-readable recording medium is FD (floppy (Registered trademark) It means a recording medium such as a disc), a CD (compact disc), or an MD (mini disc), but is not limited as long as it can be read by a computer.
[0009]
As another aspect of the present invention, in a system comprising a host computer 10 and a computer 18 of a person to be measured connected to the host computer 10 by an electric communication line 11, the host computer 10 uses the electric communication line as a target mark. 11 to display the target mark on the computer display 15 of the measured person and the response input of the measured person from the measured person computer 18 A response reception step 106 received by the host computer 10 via the telecommunication line 11, a determination step 108 in which the host computer 10 determines whether the response is correct, a display step 105, a response reception step 106, and a determination step 108 Repeat the steps multiple times and the host The computer 10 aggregates the measurement results, transmits the measurement results to the computer 18 of the measurement subject, and displays the measurement results on the computer display 15 of the measurement subject. Provide a measuring method. Moreover, as one preferable other aspect, it is desirable that the computer of the person to be measured is the portable information terminal 12. A computer-readable recording medium 19 on which a program for executing this method is recorded is also provided.
The telecommunication line includes a wireless line such as a cellular phone, a telephone line, a digital line, an analog line, the Internet connected by the TCP / IP protocol, and is not limited as long as it is a communication means used for transmitting and receiving data.
[0010]
In another system according to the present invention, a group including color blindness, contrast visual acuity, and dynamic visual acuity in a system including a host computer 10 and a computer 18 of a measurement subject connected to the host computer 10 by an electric communication line 11 The host computer 10 transmits a visual target mark to the computer 18 of the person to be measured via the telecommunication line 11 to view the target mark on the computer display 15 of the person to be measured. The display step 205 for displaying the mark, the response receiving step 206 for receiving the response input of the measured person from the measured person's computer 18 to the host computer 10 via the telecommunication line 11, and the host computer 10 A determination step 208 for determining based on the response; A visual acuity measurement method comprising: a result display step (212 to 215) in which a measurement computer aggregates measurement results, transmits the measurement results to the computer of the subject, and displays the measurement results on the computer display of the subject To do. Moreover, as one preferable other aspect, it is desirable that the computer of the person to be measured is the portable information terminal 12. A computer-readable recording medium 19 on which a program for executing this method is recorded is also provided.
[0011]
According to another aspect of the present invention, there is provided a method for measuring flicker recognition visual acuity in a system comprising a host computer 10 and a computer 18 of a measurement subject connected to the host computer 10 by an electric communication line 11. A display step 305 in which the host computer 10 transmits the target mark to the computer 18 of the person to be measured via the telecommunication line 11 to display the target mark blinking at a changing speed on the computer display 15 of the person to be measured; A response input at the time when the measurer can no longer recognize the blinking that the target mark could be recognized or when the measurer can recognize the blinking that could not be recognized is sent from the computer 18 of the subject via the telecommunication line 11. A response reception step 306 received by the host computer 10 and the host computer. The host computer 10 records the blinking speed recording step 308 for recording the blinking speed corresponding to the response input, the display step 305, the response receiving step 306, and the blinking speed recording step 308 are repeated one or more times. A measurement method of flicker recognition visual acuity including a result display step (309 to 312) for collecting the measurement results, transmitting the measurement results to the computer 18 of the measurement subject, and displaying the measurement results on the computer display 15 of the measurement subject. I will provide a. Moreover, as one preferable other aspect, it is also desirable that the computer 18 of the person being measured is the portable information terminal 12. A computer-readable recording medium 19 on which a program for executing this method is recorded is also provided.
[0012]
As another aspect according to the present invention, in a system comprising the computer 18 of the subject and a camera 20 connected to the computer 18 of the subject, step 404 for obtaining an image of the eye of the subject as a moving image; Visual acuity including step 405 for measuring the number of blinks based on the image and step 408 for displaying the number of blinks and / or a message on the computer display of the subject based on the measured number of blinks Provide a method to prevent decline. Moreover, as one preferable other aspect, it is desirable that the computer of the person to be measured is the portable information terminal 12. A computer-readable recording medium 19 on which a program for executing this method is recorded is also provided.
[0013]
As another aspect of the present invention, a host computer 10, a computer 18 of a measurement person connected to the host computer 10 by an electric communication line 11, a camera 20 connected to the computer 18 of the measurement person, A step 404 for obtaining an image of the eye of the subject as a moving image, a step 405 for measuring the number of blinks based on the image, and a computer display of the subject based on the measured number of blinks Step 408 for displaying the number of blinks and / or a message at the same time, and an input receiving step for the host computer 10 to receive the measurement subject input from the measurement subject computer 18 via the telecommunication line 11. 411 and the host computer 10 asks the person to be measured regarding the input. It sends information to the computer 18, provides a method of preventing loss of vision including the information display step 412 for displaying information to a computer display 15 of the subject. Moreover, as one preferable other aspect, it is desirable that the computer of the person to be measured is the portable information terminal 12. A computer-readable recording medium 19 on which a program for executing this method is recorded is also provided.
[0014]
As another aspect according to the present invention, display means 4 for displaying a target mark, response accepting means 7 for accepting an input of a measurement subject's response thereto, control for controlling both means and judging whether or not the response is correct A practical visual acuity measurement system including means 6, a timer function 5 for bringing the display means 4 and the response accepting means 7 into a measurement state for a set time, and a result display means 8 for displaying a measurement result. provide. As another preferred embodiment, it is also preferable that the time set for the timer function 5 is variable and the time measurement is started by a measurement start button. Furthermore, as another preferred mode, it is also preferable that the control means 6 gives a command of a target mark to be displayed next to the display means 8 by judging whether the response is correct or incorrect. As another preferred mode, it is also preferred that the display means displays the lowest visual acuity among the measurement results.
[0015]
As another aspect according to the present invention, the method has a step of setting a visual acuity measurement time, a step of repeating visual acuity measurement during the visual acuity measurement time, and a step of displaying a result of the visual acuity measurement. A method for measuring visual acuity is provided.
[0016]
【Example】
Embodiments of the present invention will be described below together with illustrated examples.
[Example 1: Practical visual acuity measurement system]
FIG. 1 is a conceptual configuration diagram of a practical visual acuity measurement system as an embodiment according to the present invention, and a target mark display unit 4 as a display means for displaying a target mark by being refracted by a mirror 3 through an eyepiece lens 2. Is disposed inside the housing 1 so that the user can look through. A joystick 7 as a response receiving means for the subject to respond to the display means, a control means 6 for controlling both means to determine whether the response is correct, and the display means and the response input means for a set time As shown in FIG. 1, a timer function 5 that sets the measurement state and a liquid crystal display means 8 that displays the measurement result are disposed inside and on the surface of the housing 1. The control means 6 is mainly composed of a computer and software operating on the computer, and is connected to the target mark display unit 4, the joystick 7, the timer function 5, and the result display means 8, and makes a determination of whether the response is correct or not, and measurement by the timer function. Maintain state and calculate measurement results. Reference numeral 5a denotes a measurement start button attached to the timer function 5. Around that, a setting dial 5b for changing the setting time of the timer function 5 is provided.
[0017]
Next, the measurement procedure using this system will be described. The system according to this embodiment is not connected to the network in a stand-alone form.
A power switch (not shown) is turned on, and the person to be measured looks into the target mark display unit 4 from the eyepiece 2. The setting dial 5b of the timer function 5 is set to a predetermined setting value, for example, 15 seconds, and the measurement start button 5a is pressed, whereby the visual acuity measurement is started. The measurement subject gazes at the target marks displayed one after another (for example, a mark indicating an opening direction by a notch in the ring) on the target mark display unit 4 and answers with the joystick 7. The control means 6 determines whether the response is correct or not, and determines a target mark command to be displayed next. When the response is correct, the next instruction to display a smaller target mark is issued. When the response is incorrect, the next instruction to display a larger target mark is issued. Thus, for example, as shown in FIG. 2, the measurement is continuously performed at the measurement points P0 to P4 every 3 seconds until the set time of the timer function 5 has passed. For example, the control means 6 calculates a measurement value indicating the lowest visual acuity among the measurement results, and displays it on the result display means 8. This result indicates the practical visual acuity of the measurement subject. The display of the target mark is repeatedly performed during the set time of the timer function 5. This display may be performed at regular intervals as described above, or may be based on the timing of response by the joystick 7. In the latter case, the measurement subject having a quick response can display the target mark every 2 seconds or less, and a highly accurate result can be obtained.
[0018]
[Example 2: Practical visual acuity measurement system using computer or portable information terminal]
FIG. 3 is a schematic view 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 18 of the computer 18 or the portable information terminal 12 as a display means displays a target mark. As the target mark, a Landolt ring, E mark, hiragana, katakana, and the like were used. As a response receiving means for inputting a response that the measured person has recognized and confirmed the target mark, 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 that puts the display unit and the response receiving unit into the measurement state during the set measurement time can be realized as a software program that operates on the host computer 10 connected via the Internet. As the result display means for displaying the measurement result, the above-described computer 18 or the displays 13 and 15 of the portable information terminal 12 are used.
[0019]
The measurement method by this system in the flowchart of FIG. 4 will be described.
A person to be measured connects to a prescribed website from the computer 18 or the portable information terminal 12 by the Internet protocol connection method. The person to be measured requests source data in a format such as HTML from the host computer 10 of the prescribed website, and the initial measurement input screen for practical eyesight measurement is transferred to the computer of the person to be measured (steps 101 to 102). An input value for measurement is input on the input screen (step 103). This input value is, for example, “the size of the display of the measurement subject”, “the distance from the measurement subject's eyes to the display”, “the set time (measurement time) of the timer function”, and the like. For this, a numerical value may be input from a keyboard, or a number of tables may be selected. 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. Thereby, the target mark starts to be displayed on the display 13 or 15 of the measurement subject, and the visual acuity measurement is started (step 105).
[0020]
The person to be measured stares at the target mark displayed on the displays 13 and 15 and inputs a response through 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 whether the response is correct or not, and determines a target mark command to be displayed next on the displays 13 and 15 (step 108). When the response is correct, the next instruction to display a smaller target mark is issued. When the response is incorrect, the next instruction to display a larger target mark is issued (steps 109 to 110). As shown in FIG. 2, for example, measurement is performed at measurement points P0 to P4 every 3 seconds until the set time of the timer function is over. For example, the control means totals the measurement results that are the response data, and totals the measurement values of the visual acuity showing the lowest visual acuity among these. This visual acuity measurement result is displayed on the displays 13 and 15 which are result display means. Alternatively, the first few measurement results are excluded, the measurement value showing the lowest visual acuity is selected from the measurement results in the second half of the set period, and the result is displayed on the displays 13 and 15 as a practical value (step) 111-114). This result indicates the practical visual acuity of the measurement subject. The display of the target mark is repeatedly performed during the set time of the timer function. This display may be performed at regular intervals as described above, or may be based on the response timing by the response receiving means. In the latter case, the measurement subject having a quick response can display the target mark every 2 seconds or less, and a highly accurate result can be obtained.
[0021]
[Example 3: Color blindness measurement system using computer or portable information terminal]
FIG. 3 is a schematic view 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 18 of the computer 18 or the portable information terminal 12 as a display means displays a target mark. The optotype mark is drawn by point drawing composed of various color points for measuring color blindness, and numbers, hiragana, katakana, etc. are used. As a response receiving means for inputting a response that the measured person has recognized and confirmed the target mark, 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 that puts the display unit and the response receiving unit into the measurement state during the set measurement time can be realized as a software program that operates on the host computer 10 connected via the Internet. As the result display means for displaying the measurement result, the above-described computer 18 or the displays 13 and 15 of the portable information terminal 12 are used.
[0022]
The measurement method by this system in the flowchart of FIG. 5 will be described.
A person to be measured connects to a prescribed website from the computer 18 or the portable information terminal 12 by the Internet protocol connection method. The person to be measured requests source data in a format such as HTML from the host computer 10 of a prescribed website, and the initial measurement input screen for practical eyesight measurement is transferred to the computer of the person to be measured (steps 201 to 202). An input value for measurement is input on the input screen (step 203). This 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 (number of times of measurement)”, and the like. For this, a numerical value may be input from a keyboard, or a number of tables may be selected. 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 target mark starts to be displayed on the display 13 or 15 of the measurement subject, and the visual acuity measurement is started (step 205). The person to be measured stares at the target mark displayed on the displays 13 and 15 and inputs a response through the keyboard 16 or the mouse 17 and the portable information terminal input unit 14.
[0023]
This response is transmitted to the host computer 10 via the Internet. The determination means on the host computer 10 determines the contents of the response, and determines the target mark command to be displayed next on the displays 13 and 15 (step 208). For example, when the response matches an expected answer, the number of correct answers is counted, and when the response does not match, the number of incorrect answers is counted (steps 209 and 211). The measurement results which are these response data are totaled and it is judged whether it is color blind (steps 212-213). The host computer 10 transmits the result of the color blindness to the measurement subject's computer 18 and displays it on the displays 13 and 15 as the result display means (steps 214 to 215). The display of the target mark is repeatedly performed for the set number of times of the timer function. This display may be performed at regular intervals as described above, or may be based on the response timing by the response receiving means.
In addition, the display of the target mark can be stopped when it is determined that sufficient information about color blindness is obtained without setting the number of times of measurement.
[0024]
[Example 4: Contrast visual acuity measurement system using computer or portable information terminal]
As another embodiment of the present invention, a contrast visual acuity measurement system using a computer or a portable information terminal will be described.
The contrast visual acuity measurement system has the same system configuration and measurement method as in the third embodiment except that the target mark is changed for contrast. As the target mark for measuring the contrast visual acuity, a mark having the density of the line bundle was used.
[0025]
[Example 5: Dynamic visual acuity measurement system using computer or portable information terminal]
As another embodiment according to the present invention, a computer or portable information terminal utilizing type moving visual acuity measurement system will be described.
The moving body visual acuity measurement system has the same system configuration and measurement method as those of the third embodiment except that the target mark is changed for moving visual acuity measurement. The moving target visual acuity target mark used on the display was used.
[0026]
[Example 6: Flicker recognition visual acuity measurement system using computer or portable information terminal]
FIG. 3 is a schematic diagram showing a flicker recognition visual acuity measurement system using a computer or a portable information terminal as another embodiment according to the present invention. The display 18 of the computer 18 or the portable information terminal 12 as a display means displays a target mark. The target mark was a mark whose blinking speed changed for flicker recognition eyesight measurement. Response accepting means for inputting a response at a point where the measurement subject cannot recognize the blinking that the target mark can be recognized or can recognize the blinking that could not be recognized includes the mouse 17, the keyboard 16, and the mobile phone. The input unit 14 of the information terminal is used. The determination means for recording the blinking speed (flicker recognition speed) at the time of response is a software program on the host computer 10 connected via the Internet 11. The timer function that puts the display unit and the response receiving unit into the measurement state for the set number of times of measurement can be realized as a software program that operates on the host computer 10 connected via the Internet. As the result display means for displaying the measurement result, the above-described computer 18 or the displays 13 and 15 of the portable information terminal 12 are used.
[0027]
A measurement method using this system in the flowchart of FIG. 6 will be described.
A person to be measured connects to a prescribed website from the computer 18 or the portable information terminal 12 by the Internet protocol connection method. The measured person requests source data in a format such as HTML from the host computer 10 of the prescribed website, and transfers the initial measurement input screen for flicker recognition eyesight measurement to the measured person's computer (steps 301 to 302). . An input value for measurement is input on the input screen (step 303). This input value is, for example, “size of display of measurement subject”, “set time of timer function (measurement time)”, and the like. For this, a numerical value may be input from a keyboard, or a number of tables may be selected. 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. Thereby, the target mark starts to be displayed on the display 13 or 15 of the measurement subject, and flicker recognition visual acuity measurement is started (step 305). The person to be measured stares at the target mark displayed on the displays 13 and 15, and the flashing that cannot be recognized by the keyboard 16 or the mouse 17 or the portable information terminal input unit 14 or the flashing that cannot be recognized. Enter the point that can be recognized as a response. This response is transmitted 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 target mark is repeated one or more times during the set number of times of the timer function. This display may be performed at fixed time intervals, or may be based on the response timing by the response receiving means.
[0028]
[Example 7: Eyesight reduction prevention system]
FIG. 3 is a schematic diagram showing a visual acuity reduction preventing 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 while working on a computer for a long time, you will tend to stare at the display and the number of blinks will decrease. For this reason, the symptom of dry eye is likely to occur. In Example 7, when the number of blinks is reduced by the camera from the specified number of times per unit time, a warning message such as notification of a tendency to deteriorate visual acuity of the measured person, a check on lifestyle related to eyes, appropriate eye drops, etc. A message that promotes the eyesight correction product can be displayed on the display. This warning message displays on the display a message such as “Let's rest your eyes!”. You may display on the display the mark display which does not worsen the visual acuity which promotes the operation | movement which stretches the muscles of the eye as if looking away. Furthermore, a message for changing lifestyle such as “Would you like to watch a TV or a book nearby?” Or “How about the brightness of the room?” May be displayed.
[0029]
The visual loss prevention method by this system in the flowchart of FIG. 7 will be described.
The person to be measured inputs an input value such as the number of blinks during normal times on the input screen displayed on the display 15 of the computer 18 (step 401). This input value is, for example, “age” in addition to “number of blinks in normal times”. For this, a numerical value may be input from a keyboard, or a number of tables may be selected. It is also possible to set a fixed value. From this input value, the number of warning blinks is calculated and stored by the computer 18 of the subject using a prescribed calculation formula (step 402). The subject is oriented and focused so that the camera can capture the blink of an eye. Next, the measurement start button displayed on the display is clicked, and an image of the eye is captured by the camera to obtain a moving image (step 404). Measurement is started based on this moving image (step 405). When the measured number of blinks falls below the number of blinks, a warning message is displayed on the display 15 of the measurement subject (step 408). As described above, this warning message displays a message such as “Let's rest your eyes!” On the display. When displaying a warning message, the number of blinks may be displayed at the same time. Moreover, the display of the number of blinks may be always displayed independently on the display independently of the number of blinks (even if no warning message is displayed).
[0030]
When the warning message screen is displayed, according to the number of blinks of the person to be measured, prescription information regarding lifestyle improvement advice, appropriate vision correction, and introduction of a product for preventing vision deterioration can be received. The data related to the prescription information may be stored in advance in the computer 18 of the measurement subject, but in order to facilitate the update, it is assumed that it is stored in the host computer 10 in this embodiment. The person to be measured requests the source data of the prescription information from the host computer 10 via the Internet 11. In response to this request, the prescription information screen is transferred to the measurement subject's computer. As a result, the prescription information is displayed on the measurement subject's display 15 (step 412).
[0031]
Although not shown, another embodiment according to the present invention will be described below. The presenting 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 person to be measured stares at the target mark on the screen and responds with response input means such as a joystick or a keyboard.
The target mark displayed on the display is not limited to the conventional Landolt ring, E mark, hiragana, katakana, etc., but may be any mark indicating the direction of up, down, left, right, etc., such as animation characters and traffic signs. Alternatively, the subject to be measured may play a role of a driver in an automobile circuit game or the like, and a moving visual acuity may be inspected such as a traffic sign appearing in front of a road on the game. The response receiving means is not limited to a keyboard, mouse, or portable information terminal input unit connected to a computer, but may be an optical communication input device such as a joystick or a cordless mouse for reporting a response. The program responsible for the control means and the timer function of the set time is not only a software program on a website connected via the Internet, but also a computer-readable recording medium recording medium recording a program such as a CD-ROM or DVD It can be distributed as novelty goods such as ophthalmologists and opticians. In addition, there may be a function that can display a timeline of the measurement result or print it out by periodically making a measurement and leaving the result on a recording medium such as a website or a user's hard disk. In addition, the data may be processed so that this timeline can be used when an ophthalmologist is interviewed.
[0032]
【The invention's effect】
As described above, if the practical visual acuity measurement system of the present invention is provided, a timer function for repeatedly setting the measurement time is provided, considering the tendency of visual acuity reduction due to gaze, and since it is compact, the space of the conventional device is unnecessary, Practical visual acuity can be measured. In addition, practical visual acuity measurement, color blindness measurement, contrast visual acuity measurement, moving visual acuity measurement, and flicker recognition visual acuity measurement can be performed with a computer or a portable information terminal. In addition, by measuring the number of blinks related to eye fatigue caused by computer work, it is now possible for the subject to recognize the necessity of taking a break.
[Brief description of the drawings]
FIG. 1 is a conceptual configuration diagram of a practical visual acuity measurement system as one embodiment according to the present invention.
FIG. 2 is a diagram showing a typical example of a visual acuity measurement result of an individual who tends to dry eye.
FIG. 3 is a conceptual configuration diagram of a practical visual acuity measurement system as one embodiment according to the present invention.
FIG. 4 is a flowchart showing a practical visual acuity measurement method by 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 as an embodiment of the present invention.
FIG. 6 is a flowchart showing a flicker recognition visual acuity measuring method by a computer or a portable information terminal as one embodiment of the present invention.
FIG. 7 is a flowchart showing a computer-aided visual loss prevention method according to an embodiment of the present invention.
[Explanation of symbols]
1 housing
2 Eyepiece
3 Mirror
4 Target mark display part (presentation means)
5 Timer
5a Measurement start button
5b Setting dial
6 Control means
7 Joystick
8 Result display means
P0 to P4 measurement points
M When the eyesight recovers due to blinking
10 Host computer
11 Internet
12 Mobile information terminal
13 Display (display screen)
14 Input section
15 display
16 keyboard
17 mouse
18 Computer body
19 Recording media
20 cameras

Claims (12)

A step of accepting the measurement time setting;
A display step for displaying a target mark;
A response accepting step for accepting a response input of the measurement subject to this,
A determination step of determining whether the response is correct;
Repeating the display step, the response reception step, and the determination step a plurality of times until the visual acuity measurement time is reached ;
A practical visual acuity measurement method including a result display step of displaying a measurement value indicating the lowest visual acuity among a series of visual acuity measurement results within the visual acuity measurement time . In a system comprising a host computer and a computer of a person to be measured connected to the host computer by an electric communication line,
A display step in which the host computer transmits the target mark to the measurement subject's computer via the telecommunication line and displays the target mark on the measurement subject's computer display;
A response receiving step in which the host computer receives the response input of the measured person from the measured person's computer via the telecommunication line;
A determination step in which the host computer determines whether the response is correct;
Repeating the display step, the response reception step, and the determination step a plurality of times during a set time of a timer function that operates on the host computer;
The host computer calculates a measurement value indicating the lowest visual acuity among the series of measurement results within the set time, transmits the measurement value to the computer of the measurement subject, and displays the measurement value on the computer display of the measurement subject. A method for measuring visual acuity, including a result display step for displaying.   The visual acuity measurement method according to claim 2, wherein the computer of the measurement subject is a portable information terminal. In a system comprising a computer of a subject and a camera connected to the computer of the subject,
Obtaining an image of the eye of the person being measured as a movie;
Measuring the number of blinks based on the image;
The step of displaying the number of blinks and / or a message on the computer display of the subject based on the number of blinks measured, and the number of blinks measured has decreased from the specified number of times per unit time A method for preventing vision loss comprising: displaying a warning message . In a system comprising a host computer, a computer of a person to be measured connected to the host computer by an electric communication line, and a camera connected to the computer of the person to be measured,
Obtaining an image of the eye of the person being measured as a movie;
Measuring the number of blinks based on the image;
The step of displaying the number of blinks and / or a message on the computer display of the subject based on the number of blinks measured, and the number of blinks measured has decreased from the specified number of times per unit time Sometimes a warning message is displayed ,
An input receiving step in which the host computer receives the measurement subject's input to the display from the measurement subject's computer via a telecommunication line;
A method for preventing a reduction in visual acuity, comprising: an information display step in which a host computer transmits information requested by the subject regarding the input to the subject's computer and the information is displayed on the subject's computer display. The method for preventing a reduction in visual acuity according to claim 4 or 5 , wherein the computer of the measurement subject is a portable information terminal. A computer-readable recording medium in which a program for executing the method according to claim 1 is recorded. Display means for displaying a target mark;
A response accepting means for accepting an input of the response of the subject to be measured;
Control means for controlling both means and judging whether the response is correct or not;
A timer function for bringing the display means and the response accepting means into a measurement state for a set time;
A practical visual acuity measurement system including a result display means for displaying a measurement result. 9. The practical visual acuity measurement system according to claim 8, wherein the time for which the timer function is set is variable, and time measurement is started by a measurement start button. 10. The practical visual acuity measurement system according to claim 8 , wherein the control means gives a command of a target mark to be displayed next to the display means by judging whether the response is correct or not . The practical visual acuity measurement system according to claim 8 , wherein the display unit displays the lowest visual acuity among the measurement results. Setting a visual acuity measurement time;
Repeating visual acuity measurement during the visual acuity measurement time;
And a step of displaying a result of the visual acuity measurement.

Images