JP2001204688A - Eidoptometric instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eidoptometric instrument with which a wrong eye among right or left eyes can be prevented from tested and a test can be effectively performed in the test (eidoptometry). SOLUTION: The instrument is provided with a visual target display part for displaying a visual target to a person to be examined, an eye shielding tool used for shielding the visual field of one eye by being held with one hand of the person, a tested-eye discriminating means for discriminating right and left eyes to be examined free from shielding by the eye shielding tool, a transmitting means for transmitting discrimination information by the discrimination means by wireless, a receiving means for receiving the transmitted signals, and an outputting means for outputting the received discrimination information of the examined eye.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity measuring apparatus using an eye shield for shielding one eye of a subject.

[0002]

2. Description of the Related Art In a visual acuity test, a visual target is sequentially presented to a subject, a response of the subject to the presented visual target is obtained, and a visual acuity is obtained by associating the presented visual target with the response of the subject. Determine the value.

Recently, a visual target presenting means is incorporated in a dark box, a response to the presented visual target is input by lever operation, and a visual acuity value is automatically determined by judging correctness of the input content. Measuring devices have also been proposed.

[0004]

In a simple visual acuity test, a peeping type device as described above is sufficient, but the same measurement result as in a general test at a test distance of 5 m cannot be expected. In a visual acuity test that does not use a peeping type device, the subject is provided with an eye shield, and the eye to be measured is instructed to cover the non-measurement eye with this eye shield, and the eye to be measured is determined, and the test is performed.
The subject may mistake the eye to be shielded by the examiner in response to the instruction of the examiner, or may mistake the left and right of the measurement result by forgetting to check the shielding state.

In an inspection using an eye shield, it has been difficult to automate the measurement by associating the measurement eye with the measurement result. Furthermore, it is difficult for an inexperienced person to input a response to the target by operating the lever after the subject has an eye shield.

The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide a visual acuity measuring apparatus that prevents an error in right and left in an inspection (measurement) using an eye shield and that can perform efficient measurement.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) An optotype presenting section for presenting an optotype to the subject, an eye-shielding device for holding the subject's hand to block the field of view of one eye, and provided on the eye-shielding device and not shielded Measuring eye discriminating means for discriminating the left and right of the measuring eye of the subject; transmitting means provided on the eye shield for transmitting discrimination information by the measuring eye discriminating means by wireless communication; and receiving the transmitted signal It is characterized by comprising receiving means, and output means for outputting the received measurement eye discrimination information.

(2) The measuring eye discriminating means of (1) is characterized in that the measuring eye is discriminated by the wave energy detecting means for emitting wave energy toward the face of the subject and detecting its reflection.

(3) In the visual acuity measuring device of (2),
The wave energy detecting means is provided at two places on the left and right of the eye shield, and the measuring eye discriminating means discriminates the left and right of the measuring eye based on the difference between the left and right outputs of the wave energy detecting means. I do.

(4) In the visual acuity measuring device of (3),
The measuring eye discriminating means determines that the measurement is a binocular measurement when the output of the wave energy detecting means on the left and right is substantially the same.

(5) In the visual acuity measuring device of (1),
Response input means for inputting a subject's response to the optotype presented to the optotype presenting section, and visual acuity measurement for automatically determining the correctness of the input response and presented optotype and automatically determining an acuity value Means, and the output means outputs the measurement result in association with the discrimination information by the measurement eye discriminating means.

(6) In the visual acuity measuring apparatus of (5),
The response input means is a voice input means for inputting a voice of the subject's response provided on the eye shield, a voice recognition means for recognizing the voice input by the voice input means, and a Voice generating means for generating a voice for guiding a person, wherein the voice generating means is provided on the eye shield.

(7) An optotype presenting section for presenting an optotype, an eye-obstructing device for holding the subject's hand to obscure the visual field of one eye, and an examination for the presented optotype provided on the eye-obstructing device Voice input means for inputting a voice of the response of the subject, voice generating means provided on the eye shield to generate a voice for guiding the subject during measurement, and recognizing the voice input by the voice input means It is provided with voice recognition means, and control means for switching and controlling the visual target presentation of the visual target presentation unit based on the response of the recognized voice.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an external view of a main body of an optotype 1 arranged at a predetermined actual distance (5 m or the like) from an eye to be examined. FIG. 2 is a diagram showing the configuration of the eye shield 6 according to the present invention, and FIG. 2 (a) is a front view seen from the subject side, and FIG.
2B is a side view, and FIG. 2C is a back view.

The eye shield 6 comprises an elliptical shield 7 for closing the front of the subject's eye and a holder 8 held by the hand of the subject. The holder 8 extends downward from the shield 7. It is attached integrally.

On the front side of the shielding portion 7, two reflection sensors 20 and 21 for detecting a measuring eye are provided on the left and right. Each of the reflection sensors 20 and 21 includes a light emitting portion of an LED that emits infrared light and a photodetector that receives the reflected light. The mounting positions of the reflection sensors 20 and 21 are shown in FIG.
As shown in the figure, when the right eye is shielded, the reflection sensor 21
Is placed on the shield 7 so that the reflection sensor 20 is sufficiently removed from the side of the face on the right eye side (the opposite is true when the left eye is shielded). Since the face of the subject is in front of the reflection sensor 21, the light beam emitted from the light emitting unit is reflected on the face of the subject, and is received by the photodetector of the reflection sensor 21, and the amount of received light increases. On the other hand, since the face is not in front of the reflection sensor 20 side, the amount of reflected light received by the photodetector on the reflection sensor 20 side is much smaller than that on the reflection sensor 21 side. Therefore, by comparing the magnitudes of the light receiving signals on the reflection sensor 20 side and the reflection sensor 21 side, it is possible to determine whether the eye in the shielded state (the measurement eye which is the unshielded eye) is left or right.

In the case of measurement with both eyes open, FIG.
(B) As shown in FIG.
As a result, the amounts of light (output signals) received by the photodetectors of the reflection sensors 20 and 21 become substantially the same. At this time, it is determined that the measurement eyes are both eyes.

In the above description, a sensor utilizing a light beam has been described as an example of a sensor for discriminating a measurement eye. However, the present invention is not limited to this, and any sensor capable of emitting wave energy such as ultrasonic waves and detecting its reflection can be used. Available as well.

A speaker 22 is provided above the shielding unit 7 as a voice generating means for generating a voice guide.
As the arrangement of the sound generating means, it is also possible to attach a separate speaker or earphone to the subject, but in the case of the former, it hinders when performing a plurality of tests at the same time,
In a quiet optometrist, it is harsh to another person. Also, in the latter case, it is troublesome to wear each time the subject changes, in order to quickly perform the measurement. Since the speaker 22 is provided on the eye shield 6 held by the subject, the voice guide can be easily transmitted to the subject with the lowest possible volume, and the eye shield 6 can be handed over when the subject changes. Easy.

The holding section 8 is provided with a microphone 23 as voice input means. When a microphone for voice input is prepared, the recognition rate in voice recognition is likely to decrease due to extraneous voice, and therefore it is preferable to be as close as possible to the mouth of the subject. The microphone can be placed on the subject, but it is troublesome to wear the microphone every time the subject changes, like the speaker. Microphone 23 on eye shield 6
Is provided, it is easy to hand only when the subject changes, and the microphone 23 is used when the eye shield 6 is used.
Comes closer to the subject's mouth.

A signal transmitting / receiving unit 10 for transmitting / receiving an infrared pulse signal is provided on the back side of the shielding unit 7. The light emitting unit of the signal transmitting / receiving unit 10 includes a code modulation circuit and a light emitting element, and the voice information from the microphone 23 and the determination result of the eye to be measured are converted into an infrared pulse signal and transmitted by wireless communication. The receiving unit includes a light receiving element, a preamplifier, a detection circuit, and the like, and receives an infrared pulse signal transmitted from the optometer main body 1.

A joystick 9 is disposed below the holding unit 8, and when the subject tilts the tip of the joystick 9 in any of up, down, left, and right directions, the voice recognition rate is poor or the voice cannot be recognized. In a case (for a foreigner, a language impaired person or the like), it can be used as an up / down / left / right recognition switch instead of a voice recognition signal. In addition, the joystick 9 also functions as a start switch for starting the inspection.

The eye shield 6 is driven by a battery mounted therein.

In FIG. 1, a liquid crystal plate 2 for displaying an optotype is disposed at the center of the front of an optometer main body 1 as an optotype presenting section. The liquid crystal panel 2 has 0.3, 0.7,
A Landolt ring with a visual acuity value of 1.0 can be displayed, and the direction of the cut in the Landolt ring with each visual acuity value can be changed to four directions, up, down, left, and right.

Reference numerals 3a, 3b, 3c, and 3d denote direction indicator lamps corresponding to the four cuts of the Landolt's ring, and the response directions in which the subject answers by voice (or joystick 9) to the displayed target. The lamps 3a, 3
b, 3c, and 3d respectively light up. Reference numeral 4 denotes a signal transmitting / receiving unit that transmits and receives infrared light, and has a configuration similar to that of the signal transmitting / receiving unit 10 on the eye shield 6 side. Reference numerals 5a, 5b, and 5c denote display units for displaying visual acuity measurement results, which include a display unit 5a for a right eye acuity value, a display unit 5b for a left eye acuity value, and a display unit 5c for a binocular acuity value. 5d, 5e and 5f are LEDs for outputting as a display the left / right discrimination result of the eye to be measured on the eye shield 6 side. The LED 5d is used for the right eye measurement, and the L is used for the left eye measurement.
When the ED 5e performs measurement with both eyes open, the LED 5f lights up.

FIG. 4 is an external view of the remote controller 50. 51 has the same configuration as the signal transmitting / receiving unit 10,
A signal transmitting / receiving unit for receiving / transmitting an infrared pulse signal. Reference numeral 53 denotes a group of switches for selectively switching the direction of the cut of the Landolt ring optotype having a visual acuity of 0.3, 0.7, and 1.0, and is used for manual measurement.
Reference numeral 58 denotes a switch for setting a manual mode.

Reference numeral 56 denotes a start switch for executing the automatic inspection program, which is operated by the examiner when the voice input by the eye shield 6 and the voice guide are not used. Reference numeral 54 denotes a group of direction input switches for allowing the examiner to input the response of the subject when executing the automatic examination program, and has up, down, left, and right switches. Reference numeral 57 denotes a switch for proceeding with the inspection program when the examiner cannot answer. Reference numeral 52 denotes a liquid crystal display, which displays a visual target displayed on the optometer main body 1 side and its visual acuity value. In addition, the display 52 displays the determination result of the eye to be measured by the eye shield 6. When the measurement eye is the right eye, the letter “R” is displayed as shown in FIG. 4, when the measurement eye is the left eye, the letter “L” is displayed, and when the both eyes are open, the letter “B” is displayed. .

Next, the operation will be described with reference to the block diagram of FIG. The arithmetic control unit 30 of the optotype main body 1 determines whether the subject's response to the presented optotype is correct or not,
There is a program for automatic measurement for sequentially changing presented targets based on the determination result and determining a visual acuity value. First,
The case of automatic measurement by voice input will be described.

After the subject is provided with the holding portion 8 of the eye shield 6 and one of the eyes is blocked by the shield 7, the operator is instructed to respond with the joystick 9 when ready for the monocular examination. . When the subject tilts the joystick 9 up, down, left, or right, a visual acuity test is started. First, it is assumed that the subject shields the left eye with the eye shield 6 and starts the measurement with the right eye.

When the signal of the joystick 9 is input, the control unit 40 of the eye shield 6 instructs the subject with a voice guide to shield the left eye for the right eye inspection. Thereafter, the reflection sensors 20 and 21 are operated, and the left and right discrimination results of the measurement eye are obtained based on the signals from the reflection sensors 20 and 21. An examination start signal is transmitted to the optometer main body 1 through the signal transmission / reception unit 10 together with the determination result of the eye to be measured. The reflection sensors 20 and 21 may be operated intermittently, and a signal of the determination result may be transmitted each time.

When the signal from the eye shield 6 is input, the arithmetic and control unit 30 of the optometer main body 1 turns on one of the LEDs 5d, 5e and 5f corresponding to the left / right discrimination result of the eye to be measured. Further, a Landolt ring visual target having a visual acuity value of 1.0 is displayed on the liquid crystal plate 2 via the liquid crystal driving circuit 31. In order to prevent the subject from memorizing the direction of the break, the top, bottom, left and right of the direction of the break are randomly selected using a random number table.

The arithmetic control unit 30 transmits a signal indicating that the target is displayed to the eye shield unit 6 side. The control unit 40 outputs a voice guide asking the speaker 22 about the direction of the break of the optotype based on this signal. When the subject visually recognizes the direction of the cut in the optotype, the subject responds orally. The voice of the subject is input through the microphone 23, converted into an infrared pulse signal via the control unit 40, and transmitted from the transmission / reception unit 10 to the optometer main body 1.

The response signal of the subject is input to the voice signal recognition section 32 via the signal transmission / reception section 4. Voice signal recognition unit 3
2 is the voice of the subject, “right”, “left”, “up”,
It recognizes “below” and “don't know” and transmits the recognized response signal to the arithmetic and control unit 30. It should be noted that the voice to be answered by the subject only needs to be “right”, “left”, “up”, “down”, and “don't know” by using a voice guide from the speaker 22 at the beginning of the test. Tell the subject. In addition, when the response from the subject is other than these, or when the subject cannot be recognized, a voice guide for asking the direction again is issued.

The arithmetic and control unit 30 controls the lamps 3a, 3b, 3c,
Light 3d. Further, the arithmetic and control unit 30 determines whether or not the response signal of the subject matches the optotype signal sent to the liquid crystal drive circuit 31. If both match, it is determined to be correct, and if they do not match, it is determined to be incorrect. still,
If the answer is correct, the lamps 3a, 3b, 3c, 3d may be blinked or the like to indicate the fact.

After determining whether the visual acuity value 1.0 is correct or not, the arithmetic and control unit 30 controls the liquid crystal drive circuit 31 after one second by a pre-programmed method to control the visual target in a different direction of the visual acuity value 1.0. Is displayed on the liquid crystal panel 2. When the correct answer is obtained twice, it is determined that the visual acuity 1.0 is determined. When the correct answer is not obtained (including the case where the answer is unknown), the optotype having the visual acuity value of 1.0 is displayed again. If a correct answer is obtained in two of the three directions, the arithmetic and control unit 30 determines that the eyesight is present. When it is determined that the eye to be measured does not have visual acuity of 1.0, the arithmetic and control unit 30 instructs the liquid crystal drive circuit 31 to display a visual target with a visual acuity of 0.7. Similarly, when it is determined that the measuring eye does not have the visual acuity of 0.7,
Further, an inspection is performed by displaying an optotype corresponding to a visual acuity of 0.3.
Each time the target is changed, the speaker 22 of the eye shield 6 is changed.
Outputs a voice asking about the direction of the break, and the subject responds verbally with the recognition result. The arithmetic and control unit 30 determines whether the interpretation result signal input through the signal transmission / reception units 10 and 4 and the audio signal recognition unit 32 and the presentation target are correct, and then switches the target displayed on the liquid crystal panel 2. Control and determine the final visual acuity value. When the visual acuity value of the right eye is determined, the display unit 5a
Is displayed (output).

When the measurement result of one eye is obtained, the arithmetic and control unit 30 transmits a signal to switch the measurement eye to the other eye via the signal transmitting and receiving unit 4. In response to this signal, the control unit 40 makes a sound from the speaker 22 so that the right eye (the measurement eye is the left eye) and the joystick 9 responds when ready. Is output.

The control unit 40 activates the reflection sensors 20 and 21 in response to the input signal of the joystick 9 to obtain the left and right discrimination results of the eye to be measured. Send. Arithmetic control unit 30
When a signal from the eye shield 6 is input, the LED 5e corresponding to the determination result (left eye) of the eye to be measured is turned on, an optotype having a visual acuity value of 1.0 is displayed on the liquid crystal panel 2, and the right eye is displayed. A visual acuity test is started in the same manner as in the case of. The measurement result of the left eye is displayed on the display unit 5b.
Will be displayed.

After the measurement result of the left eye is obtained, a test for opening both eyes is subsequently performed. The subject is instructed from the speaker 22 to put the eye shield 6 on his / her chest as shown in FIG. After the subject is ready, the joystick 9 is operated to transmit a signal from the eye shield 6 to start the binocular examination. In the case of the binocular measurement, the visual acuity value is displayed on the display unit 5c.

When all the measurement results are obtained, it is possible to print out the data from a printer or output the data to a data management computer or the like in association with the discrimination information of the eye to be measured and the measurement results.

Next, the case where the examiner performs manual measurement and automatic measurement using the remote controller 50 will be briefly described.

At the time of manual measurement, the switch 58 is set to the manual mode. The signal is output from the signal transmission / reception unit 51 via the control unit 60 and is input to the optometer main body 1 side. At this time, the arithmetic control unit 30 and the control unit 40 do not execute the inspection program by voice input and voice guidance.

For the subject, the left eye (or the right eye) is
After the shield, the joystick 9 is instructed to be operated when ready. As described above, the left / right discrimination signal obtained by the operation of the reflection sensors 20 and 21 is output from the signal transmission / reception unit 10. When a left / right discrimination signal is input via the signal transmission / reception section 51, the control section 60 of the remote controller 50 controls the display drive circuit 62 to display the measurement result of the eye to be measured on the display 52. Thus, the examiner can check the measurement eye with the controller 50 at hand without turning his or her eyes toward the subject and checking the occlusion state by the eye shield 6. The examiner switches the switch group 5 to present the optotype.
When one of the three is pressed, the signal is output from the signal transmission / reception unit 51 via the control unit 60 and is input to the optometer main body 1 side. The arithmetic and control unit 30 causes the liquid crystal panel 2 to display a target corresponding to the signal of the switch group 53. To switch the target, another switch of the switch group 53 is pressed. Thus, visual acuity measurement can be performed by switching the target.

Also, the automatic inspection program can be performed without using voice input and voice guide by the eye shield 6,
In this case, the automatic inspection program described above is executed by pressing the switch 56. The examiner inputs the verbal response of the subject through the switch group 54 and the switch 57 and proceeds with the examination program. When the automatic inspection program is advanced by the controller 50, if the determination result of the eye to be measured from the eye shield 6 and the measurement result are displayed on the display 52 in association with each other, the measurement eyes can be prevented from being mixed and accurate. Measurement results can be obtained.

[0045]

As described above, according to the present invention,
It is possible to prevent left and right mistakes in the measurement using the eye shield and to accurately associate the measurement result with the measurement result. Further, even in the measurement using the eye shield, an automated visual acuity measuring device capable of outputting the measurement results for the left and right eyes can be realized. Further, it is possible to realize a visual acuity measuring device that can perform efficient measurement without requiring a switch operation for responding to the target identification result.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front view of a main body of an eyesight meter.

FIG. 2 is a diagram showing the front, side, and back surfaces of the eye shield.

FIG. 3 is a diagram illustrating a state where an eye is shielded by an eye shield;

FIG. 4 is a front view of a remote controller.

FIG. 5 is a diagram showing a block configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optometer main body 2 Liquid crystal board 4 Remote control transmission / reception part 5a Display part of right eye acuity value 5b Display part of left eye acuity value 5c Display part of binocular acuity value 5d LED which shows that the measurement eye is the right eye 5e Measurement LED 5f indicating that the eye is the left eye 5f LED indicating that the measurement eye is both eyes 6 Eye shield 7 Shielding unit 10 Signal transmission / reception unit 20 Reflection sensor 21 Reflection sensor 22 Speaker 23 Microphone 30 Operation control unit 32 Voice signal recognition unit

Claims (7)

[Claims] An optotype presenting unit for presenting an optotype to a subject;
An eye shield that the subject holds in his / her hand to block the visual field of one eye, a measurement eye discriminating means provided in the eye shield, and which determines left and right of the unmeasured subject's measurement eye; and the eye shield Transmitting means for transmitting the determination information by the measurement eye determination means by wireless communication, receiving means for receiving the transmitted signal, and output means for outputting the received determination information of the measurement eye, An eyesight measuring device, comprising: 2. A visual acuity measuring apparatus according to claim 1, wherein said measuring eye discriminating means discriminates a measuring eye by means of a wave energy detecting means for emitting wave energy toward a face of a subject and detecting its reflection. . 3. The visual acuity measuring device according to claim 2, wherein said wave energy detecting means is provided at two places on the left and right of said eye shield, and said measuring eye discriminating means has a difference in output between said wave energy detecting means on the left and right. A visual acuity measuring apparatus characterized in that left and right sides of a measuring eye are determined based on the visual acuity. 4. The visual acuity measuring apparatus according to claim 3, wherein said eye-measuring means determines that the measurement is a binocular measurement when the output of the wave energy detecting means on the left and right is substantially the same. apparatus. 5. The visual acuity measuring apparatus according to claim 1, wherein response input means for inputting a response of the subject to the optotype presented to the optotype presenting section, and correctness of the input response and the presented optotype. And a visual acuity measuring means for automatically determining a visual acuity value by determining the visual acuity value, wherein the output means outputs the measurement result in association with the discrimination information by the measuring eye discriminating means. 6. The visual acuity measuring device according to claim 5, wherein the response input means is a voice input means provided on the eye shield for inputting a voice of a response of the subject, and the response input means is provided by the voice input means. Voice recognition means for recognizing the voice, and voice generation means for generating a voice for guiding the subject at the time of measurement, wherein the voice generation means is provided on the eye shield device. Eyesight measuring device. 7. An optotype presenting section for presenting an optotype, an eye shield that is held by a subject in a hand to obscure the field of view of one eye, and a subject provided on the eye shield for the presented optotype. Voice input means for inputting a voice of the response of the user, voice generating means provided on the eye shield to generate a voice for guiding the subject during measurement, and voice for recognizing the voice input by the voice input means A visual acuity measuring apparatus comprising: recognition means; and control means for switching and controlling the optotype presentation of the optotype presenting section based on a response of the recognized voice.