JP2002200041A - Eye testing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eye testing instrument which can easily provide the result of a visual acuity test without confusion in different target presentation conditions. SOLUTION: This eye testing instrument for the visual acuity test of a subject is equipped with a first target presentation means to present a testing target under a condition of brightness and contrast defined by a prescribed standard, a second target presentation means with at least one of the presentation of target in which glare light is projected against the visual acuity test by the first target presentation or the presentation of target in which the contrast is changed, a test mode switching means to switch visual acuity test modes by the first and second presentation means, a memory means to respectively store visual acuity obtained by both modes, and an output means to output eye acuity in both test modes stored in the memory means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometric apparatus for examining the eyesight of a subject.

[0002]

2. Description of the Related Art An optometry apparatus for examining the eyesight of an eye to be examined usually presents an eyesight test chart made of a Landolt ring, a hiragana, a numeral, or the like at a predetermined distance, and visual acuity is obtained by responding to the appearance. inspect. Furthermore, an optometer combined with a refractor (a subjective eye refractive power measuring device) that switches the correction optical system before the eye can measure the visual acuity after correcting the refractive error and the visual acuity with the glasses worn before.

[0003] By the way, the optotype presented in the conventional visual acuity test has been prepared under the conditions of brightness and contrast between the optotype and the background defined by JIS standards or the like. But,
There are various states in the visual environment of daily life, and normal visual acuity is good, but there are some people whose visual acuity is significantly reduced under a certain visual environment. A glare visual acuity test function that performs a visual acuity test while intentionally illuminating the subject with dazzling illumination light, and a visual acuity test by changing the contrast ratio between the visual target and its background to find and deal with such a person There is a device that incorporates a contrast visual acuity test function that performs the following.

[0004]

However, the conventional apparatus does not store the results of the ordinary visual acuity test, glare visual acuity test, and contrast visual acuity test, and the test results are stored in a medical chart or the like. Was recorded.

[0005] Further, in the conventional optometer combined with an electric refractor, there is a problem that the visual acuity value corresponds to only one kind, and it is not possible to know in which state the inspected visual acuity value is. Further, when a visual acuity test is performed on the same subject under different visual target presentation conditions as described above, there is a problem that the storage of the visual acuity value is updated.

The present invention has been made in view of the above-mentioned problems of the prior art,
The results of each visual acuity test under different optotype presentation conditions can be
An object of the present invention is to provide an optometric apparatus that can be easily known.

[0007]

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

(1) In an optometry apparatus for performing a visual acuity test on a subject, first optotype presenting means for presenting an inspection optotype under conditions of brightness and contrast defined by a predetermined standard,
A second optotype presenting means having at least one of an optotype presenting glare light or an optotype presenting a changed contrast with respect to the visual acuity test by the first optotype presentation; and the first and second optotypes Examination mode switching means for switching the eyesight examination mode by the presenting means, storage means for respectively storing the eyesight values obtained in each examination mode, and output means for outputting the eyesight value of each examination mode stored in the storage means. , Is provided.

(2) In the optometry apparatus of (1), a display for displaying the result of the visual acuity test, and a visual acuity value obtained by switching the visual acuity test mode are displayed on the same screen of the display as well as other visual acuity values. Display control means for displaying a visual acuity value in the visual acuity test mode.

(3) In the optometry apparatus of (1), a measurement mode switching means for switching a measurement mode for examining a visual acuity in which the eye to be examined has a different corrected state, a display for displaying the result of the visual acuity test, and the display The visual acuity values obtained by switching between the measurement mode and the visual acuity test mode are displayed on the same screen of the instrument, and the visual acuity values in each visual acuity test mode obtained for each of the other measurement modes are displayed in the currently selected visual acuity test mode. And display control means for displaying in association with each other.

(4) In the optometry apparatus of (3), there is provided a lens unit for switching and arranging various correction lenses in front of the eye to be inspected to change the correction state of the eye to be inspected, and the measurement mode switching means is provided by the lens unit. It is characterized by including a measurement mode for changing the correction state of the eye to be examined.

(5) In the optometry apparatus of (3), there is provided a calling means for calling a visual acuity value obtained in each examination mode stored by the storage means, and the display control means is provided by using the calling means. The stored visual acuity value is displayed on a screen of the display.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing the configuration of the entire optometry apparatus according to the present invention.

Reference numeral 1 denotes an optometry table arranged between the subject and the examiner, and 2 denotes a subjective eye refractive power measurement unit 2. The subjective eye refractive power measurement unit 2 is a pair of left and right lens units 2 that electrically switch and arrange various optical elements in an optometry window.
a and a suspending portion 2b for suspending the left and right lens units 2a.

Reference numeral 10 denotes a target presenting unit for presenting a test target. A window 11 made of a glass plate provided with an anti-reflection film is arranged at the upper front part of the optotype presenting unit 10, and the subject looks at the optotype at the center through this window 11. Reference numeral 12 denotes a plurality of glare inspection lamps provided on both sides of the window 11. In the present embodiment, high-luminance white LEDs are used.

Reference numeral 100 denotes a controller for operating the subjective eye refractive power measuring unit 2 and the optotype presenting unit 10. The controller 100 can operate each device through a relay unit 3 for relaying communication of each device. Reference numeral 4 denotes a printer connected to the relay unit 3, which outputs a test result of the subject. Further, the relay unit 3 can transmit measurement data to the controller 100 by connecting the relay unit 3 to a lens meter or an objective eye refractive power measuring device via a communication cable.

FIG. 2 is a diagram showing an optical system inside the optotype presenting unit 10.

Reference numeral 13 denotes a disc-shaped optotype disc plate made of a glass plate, and a large number of test optotypes including a plurality of visual acuity value optotypes are formed on the same circumference by chromium vapor deposition or the like. The target disk plate 13 is a target disk plate motor 13a.
, And switches the target to be presented to the subject. Reference numeral 14 denotes a mask plate for masking a part of the presented target, which is rotated by the mask plate motor 14a, and applies a required mask to the target.

15 is an illumination lamp for illuminating the test target,
Reference numeral 16 denotes a condenser lens, and 17 denotes a translucent diffusion plate. 18 is a half mirror, 19 is a beam splitter, 2
0 is a concave mirror. The half mirror 18 is preferably provided with a metal half mirror coat in order to avoid coloring of light due to angle dependence.

The concave mirror 20 according to the present embodiment can be used when the distance between the eye to be examined and the window 11 of the optotype presenting unit 10 is 1.1 m.
The focal length is designed so that the optical distance between the target and the subject's eye is set to the inspection distance of 5 m. The luminous flux of the test target illuminated by the illumination lamp 15 is
After passing through the diffusion plate 17, the light is reflected upward by the half mirror 18, passes through the beam splitter 19, and is reflected by the concave mirror 20. The optotype light flux reflected by the concave mirror 20 is reflected by the beam splitter 19 and is directed to the eye to be inspected through the window 11.

Reference numeral 30 denotes a background illumination lamp for illuminating the background of the optotype image (virtual image) presented to the eye E to be examined. 3
1 is a condenser lens, 32 is a translucent diffusion plate, and 33 is a mirror. The luminous flux from the background illumination lamp 30 illuminates the condenser lens 31 and the diffusion plate 32. Diffuser 32
Is reflected upward by the mirror 33, combined with the optotype light flux by the half mirror 18, transmitted through the beam splitter 19, and reflected by the concave mirror 20. The illumination light beam reflected by the concave mirror 20 is reflected by the beam splitter 19 and travels through the window 11 to the eye to be inspected.
By changing the light amount ratio between the background illumination lamp 30 and the optotype illumination lamp 15, it is possible to change the contrast of the optotype presented to the subject's eye.

FIG. 3 is a view of the controller 100 as viewed from above. Reference numeral 101 denotes a liquid crystal display for displaying optometry information. A switch unit 102 has the following switches. 103 is a group of setting changeover switches,
A switch is used for switching the display screen of the display 30 to a menu screen and performing parameter setting and the like. 104 is an optotype switch group for switching an optotype to be presented to the optotype presenting unit 10, 105 is a mask switch group for applying a mask necessary for the presented optotype, 106 is a start switch for executing a program optometry, and 107 is a program optometry. Feed switch to advance the inspection stage of
8 is a change mode for designating a mode of measurement data or the like to be changed.
Mode designation switch group 109 is a mode for inputting data.
Input data designating switches for designating a mode or a mode to be measured; 110, an input switch for inputting data from an objective eye refraction measuring device or a lens meter; 111, output of test result data. A print switch 112 is a measurement eye designation switch, and a dial switch 113 is used for changing a measurement value or inputting a numerical value. 114a,
Reference numeral 114b denotes a changeover switch for changing over the cross cylinder, which is also used for adjusting the appearance at the prescription stage.

FIG. 4 is a block diagram for explaining the control of the apparatus. The switch signal from the switch section 102 of the controller 100 is input to the microcomputer 50 after a predetermined process. A memory 51 storing a control program such as an optometry program and a memory 52 storing measurement data and the like are connected to the microcomputer circuit 50. Microcomputer circuit 50
Converts the switch signal into various data based on a control program stored in the memory 51 and performs arithmetic processing, and controls the screen of the display 101 via the display circuit 53. The conversion signal is input to the microcomputer 55 of the relay unit 3. The microcomputer circuit 55 sends data on the refractive power to the subjective eye refractive power measuring unit 2 and data on the optotype to the optotype presenting unit 10.

The microcomputer circuit 60 of the subjective eye refractive power measuring unit 2 which has received data on the refractive power.
Drives a motor 62 via a drive circuit 61 to rotate a weak spherical disk 63, a strong spherical disk 64, an auxiliary lens disk 65, a cross cylinder disk 66, etc.
A predetermined optical system is arranged on the inspection window.

The microcomputer circuit 70 of the optotype presenting unit 10 receiving the data relating to the optotype includes a motor 1
3a, a predetermined test target is presented by driving the motor 14a.

Further, by using the print switch 111, the inspection data of the subject is discharged from the printer 4. 58 is a drive circuit of the printer 4.

The operation of the apparatus configured as described above will be described. First, a normal visual acuity test, glare test, and contrast test will be described.

<Normal Visual Acuity Test> The initial state of the apparatus is set in a normal visual acuity test mode. The switch 109a is pressed to test the naked eye vision, and the switch 109b is pressed to test the visual acuity in the eyeglass wearing state to set each of the test modes. Measurement eye is measurement eye designation switch 11
Specify by 2. When the visual acuity value visual target to be presented is selected by the switches arranged in the visual target switch group 104, the switch signal is sent from the microcomputer circuit 50 to the microcomputer circuit 70 of the visual target presenting unit 10. The microcomputer circuit 70 includes the motors 13a, 1
4a is driven, and the optotype disc 13 and the mask plate 14 are rotated to present the selected visual acuity value optotype to the subject. Information on the presented target is displayed on the display 101. Thereafter, the presented target is switched by the mask switch group 105 based on the response of the subject, and the target is sequentially switched until a legible visual acuity value is obtained.

The measurement eye is a measurement eye designation switch 112.
To change. After the test result of one eye is obtained, when the other eye is designated by the switch 112, the visual acuity value of the target presented finally is stored in the memory 52 as the test result.
Is input (stored) to If you change to another inspection mode,
The visual acuity value of the finally presented target is stored in the memory 52 as a test result.

<Glare Inspection> The glare switch 109f of the switch group 109 is pressed to enter the glare inspection mode. When the switch 109f is pressed, the microcomputer circuit 50 displays the glare inspection mode on the display 101 and transmits a glare inspection instruction signal to the optotype presenting unit 10. When the microcomputer circuit 70 receives the signal, it turns on the lamp 12 through the drive circuit 71.

FIG. 5 is a diagram showing a display state of the display 101 in the glare inspection mode. Display 10
The visual acuity value of the presently presented presenting target is presented on the central display unit 80 on the upper side of FIG. Display column 8 above central display section 80
In 0a, the content of the examination currently being performed is displayed (here, naked eye and weak glare are displayed). As described above, even if the test is performed in different eyesight test modes in the same naked eye state, since the display state of the display field 80a changes depending on the selection of the eyesight test mode, in what state is the examiner performing the eyesight test? Can understand and do not get confused. The left and right display units 81 located on both sides of the central display unit 80 store visual acuity value data obtained in the immediately preceding test (here, visual acuity value data obtained in the normal visual acuity test mode). Is displayed. The left column of the display unit 81 shows data of the right eye, and the right column of the display unit 81 shows data of the left eye.

The optotype presenting unit 10 used in the present embodiment can set the light amount (glare light amount) of the lamp 12 for illuminating (glare) the eye to be examined in two stages (strong and weak). When the switch 109f is first pressed to set the glare inspection mode, the glare light amount (weak) is set,
Next, when the same switch 109f is pressed, the mode shifts to the glare inspection mode for glare light amount (strong). Further, the switch 109
Pressing f returns from the glare inspection mode to the normal visual acuity inspection mode. At this time, the display in the display column 80a also changes to the display of the inspection state each time the switch 109f is pressed.

After the examiner selects the amount of glare light by such an operation, the examiner switches the presentation index with the mask switch group 105 based on the response of the subject, so that the glare light is turned on. To obtain the visual acuity value of. The visual acuity values of the glare light amount (strong) and (weak) obtained by the glare test are stored in the memory 52 as visual acuity value data different from the visual acuity value data obtained in the normal visual acuity test mode. The inspection is performed with the left eye, the right eye, and both eyes using the measurement eye designation switch 112.

<Contrast Inspection> The contrast switch 109g is pressed to enter the contrast inspection mode. When the switch 109g is pressed, the microcomputer circuit 50 transmits a contrast test instruction signal to the optotype presenting unit 10. Upon receiving the signal, the microcomputer circuit 70 turns on the lamp 30 through the drive circuit 71 (turns off the lamp 12 if the previous time was the glare inspection mode).

Further, the microcomputer circuit 50 displays on the display section 80a of the display 101 that the contrast inspection mode is set (here, naked eyes, contrast 25% are displayed). Also, the central display unit 80
The visual acuity value data obtained in the immediately preceding test (visual acuity value data obtained in the glare test mode) is displayed on the left and right display units 81 located on both sides of.

In the present embodiment, the left and right display section 81 displays the visual acuity value data obtained in the immediately preceding test. The obtained visual acuity value data may be always displayed for comparison.

The contrast is changed by changing the light amounts of the lamp 15 and the lamp 30 and changing the ratio of the light amount on the presented target image to the light amount around the target image. The optotype presenting unit 10 used in the present embodiment adjusts the light amount of the lamp 30 (contrast light amount) to three levels, thereby increasing the contrast ratio to three levels (2 levels).
(5%, 12%, 6%).
For details of the adjustment of the contrast ratio, refer to Japanese Patent Application No. 200
See 0-327010.

The setting of the contrast ratio is changed each time the contrast switch 109g is pressed.
When the switch 109g is first pressed, the contrast ratio is set to 25%. Thereafter, every time the switch 109g is pressed, the contrast ratio is changed in the order of 12% and 6%, and after the contrast ratio of 6%, the lamp 30 is turned off and returns to the normal eyesight test mode. At this time, each time the switch 109g is pressed, the display state of the display column 80a also changes to the display of the inspection state.

The examiner changes the contrast ratio by such an operation, and then switches the presentation index with the mask switch group 105 based on the response of the subject, thereby changing the contrast of the presented target. Obtain the visual acuity value. The visual acuity value of the subject obtained by the contrast test is different from the test mode (normal visual test mode, glare test mode)
Are stored in the memory 52 as visual acuity value data different from the visual acuity value data obtained in step (a).

When the print switch 111 is pressed after the normal eyesight test, glare test, and contrast test are completed, the microcomputer circuit 50 outputs the eyesight value data obtained in each test mode stored in the memory 52. Transmit to relay unit 3. When the microcomputer circuit 55 of the relay unit 3 receives the visual acuity value data, the microcomputer 4 causes the printer 4 to discharge the recording paper on which the visual acuity value for each inspection mode is printed through the drive circuit 58.

FIG. 6 shows a state in which the visual acuity values obtained in the respective inspection modes are printed on the recording paper 200. Display field 20
1 is a visual acuity value obtained in the normal visual acuity test mode, a display column 202 is a column of visual acuity values obtained in the glare test mode, and a display column 203 is a column of visual acuity values obtained in the contrast test mode. Is done.

Next, a case will be described in which, after performing the normal visual acuity test, glare test and contrast test as described above, a subjective test and a prescription test using the subjective eye refractive power measurement unit 2 are subsequently performed.

By pressing the subjective switch 109d, a subjective test mode is set. In this mode, the complete correction power at which the maximum visual acuity is obtained is measured. When the subject is a spectacle wearer, the power of the old spectacle lens is measured by a lens meter, and the power is input by the switches of the input data designation switch group 109 and the dial switch 113. Automatic input is also possible if connected to a lens meter. When the power data is input, a correction lens corresponding to the input power data is arranged in the inspection window of the lens unit 2a. afterwards,
The switches of the controller 100 are operated to perform a red-green inspection, an astigmatic axis adjustment and an astigmatic power adjustment, a spherical power adjustment, and a visual acuity inspection before the astigmatism inspection. The optotype required for the examination is selected by each switch of the optotype switch group 104, and the adjustment items are the mode specifying switch group 109.
The frequency is adjusted by the dial switch 113. A correction lens having the adjusted power is arranged in the inspection window of the lens unit 2a.

When the glare inspection and the contrast inspection are performed after the complete correction power is determined, the switch 109f,
By pressing the switch 109g, the glare inspection mode and the contrast inspection mode are set, and each visual acuity value is obtained in the same manner as described above.
The visual acuity values in the normal visual acuity test mode, the glare test mode, and the contrast test mode at this stage are also stored in the memory 52, respectively.

Next, the prescription switch 109e is pressed to enter the prescription mode. In this mode, the power is adjusted to the most positive power in the eyesight suitable for the purpose of using the eyeglasses of the subject. The inspection is performed by presenting a visual acuity value target. When the prescription value is determined, the prescription visual acuity is confirmed by a visual acuity test (normal visual acuity test mode).
By switching the presented target with the mask switch group 105,
The final presentation is determined as the visual acuity value. Also in this prescription stage, the switch 109f and the switch 109g
Thus, glare inspection and contrast inspection can be performed.

FIG. 7 is a diagram showing an example of a screen in the prescription mode. In the prescription mode, two inspection results are displayed on the left and right of the central display unit 80, respectively. In the example of FIG.
The results of the naked eye value 83 and the spectacle value 84 are displayed. Here, for example, when the switch 109f is pressed while the shift switch 115 is pressed to switch from the normal visual acuity test mode to the glare test (weak) mode, the microcomputer circuit 50 causes the visual acuity in the glare test (weak) stored in the memory 52 to change. The visual acuity value 83a of the naked eye value 83 and the visual acuity value 84a of the spectacle value 84 displayed on the left and right sides of the screen are also used for the glare test (weak) corresponding to the current visual acuity test mode.
Change to the value in the mode. As a result, the examiner can easily call up and compare the previous test result, that is, the visual acuity value in the glare test (weak) with the naked eye and eyeglasses (glasses worn by the subject). , Can be useful for prescribing.

In the subjective examination mode, the eyeglasses mode, and the like, when the visual acuity examination mode is switched by pressing the switches 109f and 109g while holding down the shift switch 115, the display on the left and right of the screen (display in the example of FIG. 5). Part 8
The value is changed to the value in the same visual acuity test mode in conjunction with the switching of 1).

When it is desired to know the previous test result (eyesight value), since the values in each eyesight test mode are stored in the memory 52, it is necessary to use each switch of the input data designating switch group 109. Thus, the inspection result can be displayed on the display 101 at any time.
Thereby, comparison can be easily performed.

Further, by using the menu switch and the execution switch of the setting change switch group 103,
All test results can be displayed on the display 101.

FIG. 8 is a diagram showing a state in which all the inspection results are displayed on the display 101. Here, VA is a normal visual acuity test, VA (G1) is a glare (weak) test, V
A (G2) indicates a glare (strong) test, and VA (C. 25%) indicates a contrast (25%) test. As shown in this figure, items that have not been inspected are shown in blanks, so that it is easy to determine whether all necessary inspections have been completed.

In the above embodiment, the optometry apparatus combined with the subjective eye refractive power measuring unit 2 has been described as an example. However, it is needless to say that the optotype presenting unit 10 and the optotype presenting unit 10 without the subjective eye refractive power measuring unit 2 are provided. The present invention can be similarly applied by providing a display function, a memory function, and a printing function in the configuration of the controller that operates the.

[0052]

As described above, according to the present invention, each test result in different visual acuity test modes can be easily obtained without confusion. Further, the visual acuity values in each visual acuity test mode can be easily called and compared.

[Brief description of the drawings]

FIG. 1 is an external view illustrating a configuration of an entire optometry apparatus according to the present invention.

FIG. 2 is a diagram showing an optical system inside the optotype presenting unit 10.

FIG. 3 is a diagram showing details of a controller 100;

FIG. 4 is a block diagram showing a control system of the apparatus.

FIG. 5 is a diagram showing a display state of a display 101 in a glare inspection mode.

FIG. 6 is a diagram showing a state in which visual acuity values obtained in each inspection mode are printed on recording paper.

FIG. 7 is a diagram showing an example of a screen in a prescription mode.

FIG. 8 is a diagram showing a state in which all inspection results are displayed on a display 101.

[Explanation of symbols]

 Reference Signs List 1 optometry table 2 subjective eye refractive power measurement unit 3 relay unit 4 printer 10 optotype presenting unit 50 microcomputer circuit 51 memory 52 memory 53 display circuit 100 controller 101 display 102 switch unit

Claims (5)

[Claims] A first optotype presenting means for presenting an inspection optotype under conditions of brightness and contrast defined by a predetermined standard; and
A second optotype presenting means having at least one of an optotype presenting glare light or an optotype presenting a changed contrast with respect to the visual acuity test by the optotype presenting, and the first and second optotype presenting means. An inspection mode switching unit for switching an eyesight inspection mode, a storage unit for storing each of the eyesight values obtained in each of the inspection modes, and an output unit for outputting the eyesight value of each of the inspection modes stored in the storage unit An optometric apparatus, characterized in that: 2. The optometry apparatus according to claim 1, wherein a display for displaying a result of the visual acuity test, a visual acuity value obtained by switching the visual acuity test mode is displayed on the same screen of the display, and another visual acuity is displayed. An optometry apparatus, comprising: display control means for displaying a visual acuity value in an examination mode. 3. The optometry apparatus according to claim 1, wherein a measurement mode switching means for switching a measurement mode for examining a visual acuity in which the eye to be examined has a different correction state, a display for displaying a result of the visual acuity test, and the display The visual acuity values obtained by switching between the measurement mode and the visual acuity test mode are displayed on the same screen, and the visual acuity values in each visual acuity test mode obtained for each of the other measurement modes correspond to the currently selected visual acuity test mode. An optometry apparatus, comprising: display control means for causing the display to be displayed. 4. The optometric apparatus according to claim 3, further comprising a lens unit for switching and arranging various correction lenses in front of the eye to be inspected to change the correction state of the eye to be inspected, and wherein the measurement mode switching means is provided by the lens unit. An optometric apparatus comprising a measurement mode for changing a correction state of optometry. 5. The optometric apparatus according to claim 3, further comprising a calling unit for calling a visual acuity value obtained in each examination mode stored by said storage unit, wherein said display control unit stores the visual acuity value by using said calling unit. An optometry apparatus for displaying the obtained visual acuity value on a screen of the display.