JPH0910175A - Optometric apparatus - Google Patents

Abstract

PURPOSE: To enable executing of a balance inspection for two eyes efficiently by a method wherein a fogging is applied to a one eye complete correction value of each of right and left eyes and polarizers with polarization axes thereof orthogonal mutually are arranged in front of two eyes. CONSTITUTION: In a balance inspection for two eyes, polarizers 90 with polarization axes thereof orthogonal mutually are put into right and left inspection windows of a subjective type refractivity inspecting instrument. A polarization target 91 projected by a target presenting device has a polarization target part 91a having the polarization axis thereof in the same direction as that of the right eye at the upper stage thereof, a polarization target part 91b having the axis thereof in the same direction as that of the left eye at the lower stage and a target part 91c having no polarization characteristic at the mid stage. The balance of visual acuity of right and left eyes is inspected by comparing visibility at the upper and lower stages. Fogging is applied so that the visual acuity of a person to be inspected reaches about 0.7-0.8. The value of the fogging is obtained from a table of a relationship between a visual acuity value and the degree of the fogging with a low value of the visual acuity values of the right and left eyes in the complete correction as reference. When the balance between the right and left eyes is worse, a balance correction is performed by adding a spherical diopter of +0.25D to the eye with the higher visibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus for examining the visual function of an eye to be examined.

[0002]

2. Description of the Related Art In an examination for prescribing a spectacle lens or a contact lens, a subjective refractive power measuring device in which a corrective optical system is switched to an examination window is used, and an examinee's test target is passed through the examination window to a subject. To observe. The final prescription value is obtained by operating the correction optical system and the test target based on the response of the subject. In the subjective test, a complete correction value for both eyes is determined, and then a binocular balance test for equalizing the right and left appearances is performed. One of the binocular balance inspection methods is an inspection method using a polarization optotype. This inspection is performed as follows. Clouds are applied to the left and right perfect correction values for each eye so that the visual acuity for both eyes is about 0.6 to 0.9, and polarizing plates with polarization axes orthogonal to each other are arranged in front of both eyes. Then, the eye to be inspected simultaneously observes the right-eye polarization target and the left-eye polarization target having the same axes as the polarizing plates arranged in front of the eye. With this optotype, a positive spherical power is applied to the better looking eye so that the left and right eyes are the same, and balance adjustment is performed.

[0003]

However, the binocular balance inspection of the conventional device has the following problems. (B) The amount of fog for adjusting the visual acuity between both eyes to about 0.6 to 0.9 is not uniform depending on the visual acuity value with one eye complete correction, and it is easy for an inexperienced examiner to adjust the amount of fog. is not. If you start with an appropriate amount of cloud, it is difficult to perform a highly accurate inspection.
A visual acuity index of 0.6 to 0.6 is displayed depending on the response of the subject.
It is troublesome to adjust the spherical power so as to be about 0.9, and it takes time for the eye examination. (B) When the test targets do not look the same for the left and right eyes, it is common to match the one with good spectacles or naked eyes, or the right eye. It is troublesome to see and change the display state of the device by operating the switch.

(C) After the completion of the binocular balance inspection, it is necessary to release the applied fog for the next inspection. However, it is troublesome to operate individual switches for releasing the fog amount, and
It is necessary to memorize or record the amount of fog applied, which is also troublesome. Furthermore, it is not uncommon for the next inspection to proceed without forgetting to release the cloudiness. The present invention
In view of the above-mentioned problems of the conventional apparatus, it is a technical object to provide an optometry apparatus capable of performing an accurate optometry by efficiently performing an inspection with a cloud on the eye to be inspected, particularly a binocular balance test. .

[0005]

In order to solve the above-mentioned problems, the present invention is characterized by having the following configuration. (1) In an optometry apparatus equipped with a subjective-type refractive-power measuring device having a correction optical system for applying refractive power to an eye to be inspected and a driving unit for driving the correction optical system, a refractive error of the eye to be inspected is corrected. Complete correction value determining means for making a perfect correction state, a visual acuity measuring means for measuring the visual acuity value of the eye to be completely corrected, and for reducing the visual acuity value of the eye to be completely corrected to a predetermined visual acuity value An additional power determining means for determining a power to be added to the eye to be inspected, a control means for controlling the driving means to add the additional power determined by the additional power determining means to the eye, Command signal generating means for giving a control command to the control means.

(2) The command signal generating means of (1) is a switch for starting the binocular balance test.

(3) The optometry apparatus according to (2) further includes visual acuity information display means for displaying at least one of the naked eye visual acuity value obtained by the naked eye visual acuity test or the front spectacle visual acuity obtained by the spectacle visual acuity test. And

(4) The addition power determining means of (1) is characterized by having a table of the relationship between the visual acuity value and the addition power when completely corrected.

(5) The addition power determining means of (1) is characterized in that it is determined with reference to the low visual acuity values of the left and right eyes when completely corrected.

(6) The optometry apparatus according to (1) is characterized by further including an additional power display means for displaying the additional power determined by the additional power determining means.

(7) The optometry apparatus according to (1) is characterized by having a cancellation signal generating means for canceling the addition of the frequency when the examination of a predetermined examination item is completed.

(8) The release signal generating means in (7) is characterized in that it is a shift switch for shifting to the inspection of the next inspection item.

(9) In an optometry apparatus equipped with a subjective refracting power measuring apparatus having a correction optical system for adding a refracting power to the eye to be examined and a driving means for driving the correction optical system, a refractive error of the eye to be examined is provided. A complete correction value determining means for correcting to a completely corrected state, and a power addition means for adding a power to the eye to reduce the visual acuity value of the eye to be inspected in the completely corrected state to a predetermined visual acuity value, Display means for displaying the frequency added by the frequency adding means.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing the entire configuration of the optometry apparatus according to the embodiment. Reference numeral 1 denotes an optometry table arranged between examinees. Reference numeral 2 denotes a subjective-type refractive power measuring device, and the subjective-type refractive power measuring device 2 electrically switches and arranges various optical elements on the optometry window 11. Reference numeral 3 denotes an objective eye refractive power measuring device which measures a refractive index by projecting a measurement index on the fundus of the eye to be examined and detecting a projected index image of the fundus by a light receiving means. The objective eye-refractive-power measuring device 3 is placed on a movable tray that can slide on the optometry table 1, and is moved to the center position of the optometry table 1 during the objective examination. Reference numeral 4 is a projection-type optotype presenting apparatus for presenting an examination optotype. Reference numeral 5 is a controller for operating the subjective refractive power measuring device 2 and the projection optotype presenting device 4, and 6 is a relay unit for relaying communication between the respective devices.

FIG. 2 is a view of the controller 5 as viewed from above. Reference numeral 30 is a display for displaying optometry information, and a dot matrix screen is used on the display 30 so that various information can be switched and displayed. 31 is a switch unit, and the switch unit 31 has a display 30.
Menu switch 32 for switching the display screen of the menu screen to the menu screen, and moving the cursor displayed on the display screen 2
A cursor movement switch 33, an execution switch 34, a lens switch group 35 for driving the subjective refractive power test apparatus 2, a measurement mode changeover switch group 36, a measurement eye designating switch group 37, and a numerical input Input switch group 38 having switches and knob switches, shift switch 39 used in combination with other switches, optotype switch group 40 for driving the optotype presenting apparatus 4, start switch 41a for executing the program optometry, and program feed Switch 4
A program execution switch group 41 having 1b and the like, a function switch group 42 corresponding to information displayed at a predetermined position below the screen of the display 30, and a switch group 43 for masking an optotype are arranged.

FIG. 3 is a block diagram for explaining the control of the apparatus. The switch signal from the switch unit 31 of the controller 5 is input to the microcomputer 50 after a predetermined process. A memory 51 for storing a program for operating the apparatus and a memory 52 for storing objective value data and the like are connected to the microcomputer circuit 50. The micro computer circuit 50 converts the switch signal into various data, and displays the screen of the display 30 via the display circuit 53.

Further, the micro computer circuit 50 sends the switch signal to the subjective refracting power inspection device 2 for the refractive power through the micro computer circuit 55 of the relay unit 6 and the data for the visual target. -The target presenting device 4
To each. The micro computer circuit 60 drives the motor 62 via the drive circuit 61, and the weak spherical disc 63, the strong spherical disc 64, and the auxiliary lens disc 6 are driven.
5. Rotate the cross cylinder-disk 66 and the like to arrange a predetermined optical system in the inspection window. The micro-computer circuit 70 turns on the lamp 72 via the drive circuit 71, drives the motor 74 via the drive circuit 73, and rotates the optotype disc 75 and the mask disc 76 on which optotypes are drawn. Then, a predetermined inspection target is projected on a screen (not shown) placed in front of the eye to be inspected. Microcomputer circuit 5
The objective eye refractive power measuring device 3 and the lens meter 9 are connected to the device 5, and the sent measurement data is stored in the memory 56. When a read command signal is input from the micro computer circuit 50, the micro computer circuit 55 reads the specified measurement data from the memory 56 and transfers it to the controller 5 side. 57 is a printer for outputting the measurement result, and 58 is its drive circuit.

The operation of the apparatus having the above configuration will be described. The procedure for advancing the optometry varies depending on the examiner's policy, but here, based on the procedure (refer to the flowchart in FIG. 4) when the programmed optometry of this apparatus is executed, the value after the complete correction of one eye is determined. The binocular balance test will be mainly described, and the other parts will not be described because they have little relation to the present invention. The examiner sets the inspection items and procedures of the optometry program as necessary. Press the menu switch 32 to display a menu item screen (not shown) on the display 30, and then operate the cursor movement switch 33 and the execution switch to set the screen (not shown).
open. Of the various selection items displayed on the set screen, the desired one is selected with the switch 33 or the like, and the execution switch 34 is selected.
Press to enter.

Prior to executing the optometry program, an objective test using the objective-type eye-refractive-power measuring device 3 is first performed. After that, an interview is conducted, and then the start switch 41a is pushed to start the programmed optometry. The program optometry starts from the naked-eye visual acuity test, and thereafter, by pushing the feed switch 41b, operation signals necessary for the inspection are issued to the subjective-type refractive power inspection device 2 and the optotype presenting device 4, and the inspection is sequentially performed. Objective value data by the objective eye refractive power measuring device 3
The data is stored in the memory 56 of the relay unit 6 by pressing the print switch of the objective eye refractive power measuring device 3. The data stored in the memory 56 is transferred to the objective value memory area of the memory 52 by pressing the input switch and the objective value switch of the controller 5. The examiner performs an unaided visual acuity test. The display screen of the display 30 is in the naked eye measurement mode, and the naked eye visual acuity value can be input. The optotype presenting device 4 presents an examination optotype having a predetermined visual acuity value, and the examiner obtains a response from the subject to change the presenting optotype by the optotype switch of the switch group 43 to thereby obtain the naked eye visual acuity value. Is determined and its value is input.

When the subject is wearing eyeglasses, the eyeglass data measured by the lens meter 9 is transferred to the memory 52 via the relay unit 6, and then a visual acuity test is performed with the eyeglasses. The visual acuity test using eyeglasses is performed by the subjective refractive power measuring device 2
Alternatively, a lens corresponding to eyeglass data may be arranged in the eye examination window. The test target is presented to the eye to be inspected, and the switch group 4 is set based on the response of the person to be inspected similarly to the naked eye visual acuity test.
A visual acuity value is obtained by operating 3 to switch the target.

Next, the subjective examination using the subjective refractive power measuring device 2 will be described. The examiner arranges the subjective-type refractive power test device 2 in front of the subject's eye, and designates the examined eye to perform the examination. The initial value of the optical system of the subjective refractive power measuring device 2 is set to objective value data or spectacle value data based on the selection at the time of setting the optometry program. When the objective value data is selected, the process goes to an objective correction value confirmation test for confirming the suitability of the objective value data. The objective value data copied to the subjective value memory area is read out, an optical system corresponding to the objective value data is arranged in the inspection window of the subjective refractive power inspection device 2, and the optotype presenting device is provided. 4 is operated to present a predetermined inspection target to the subject.
The display screen of the display 30 is switched to the subjective measurement mode.

After the objective correction value confirmation test is completed, the process proceeds to the inspection step for determining the complete correction value. The R / G (red green) test performed before the astigmatism test is used to determine the complete correction value.
There are inspection items for inspection, astigmatic axis detection inspection, astigmatic power detection inspection, R / G inspection for preventing overcorrection, and visual acuity inspection. These inspection items will be briefly described. R / G
In the examination, the optotype presenting device 4 presents a red green optotype, and the subjective refracting power inspection device 2 uses the SPH of objective value data.
A predetermined spherical power (for example, +
0.50D) (hereinafter referred to as "fog"). FIG. 5 shows an example of the display screen of the display 30 at this time. The lower display section 80b in the central display section 80 displays the amount of fog applied to the objective value data, and the value of the spherical power displayed in the reverse direction is displayed as a value in which the amount of fog is adjusted. Has been done. The display of the amount of fog on the lower display portion 80b allows the examiner to know that the present optical system is fogged, thereby preventing the mistake of further fog. This display disappears when the spherical power is changed by operating the knob switch.

In the astigmatic axis detection inspection, the optotype presenting apparatus 4 presents a point cloud optotype, and the controller 5 is in a mode in which the astigmatic axis can be changed. A cross cylinder lens is set in the subjective-type refractive power inspection device 2 with its reversal axis based on the objective value data. The operator inverts the cross cylinder lens by operating the input switch group 38, and compares the appearances of the visual targets before and after the inversion. The inversion axis and the astigmatism axis are moved together so that they look almost even before and after the inversion, and an accurate astigmatism axis of the subject's eye is obtained. In the astigmatic power test, the same target as in the astigmatic axis detection test is used. The controller 5 is in a mode in which the astigmatic power can be changed, and the reversal axis of the cross cylinder lens is set to be tilted at 45 degrees from the axis inspection. The examiner inverts the cross cylinder lens by a switch operation, compares the appearances of the visual targets, and obtains the astigmatic power.

When the astigmatic power and the axis can be determined, the R / G inspection for preventing overcorrection starts. The amount of fog is also displayed on the display screen during this R / G inspection. The examiner conducts a visual acuity test after reconfirming the spherical power. As the optotype, an optotype having a visual acuity value of about 1.0 is presented. The examiner determines the most positive correction power (the weakest power for myopia, the strongest power for hyperopia) that gives the highest visual acuity. When the complete correction value for one eye is determined,
In the same manner, the complete correction power and its visual acuity value are obtained for the other eye.

After the complete correction power and the visual acuity value of each eye have been obtained, the feed switch is pressed to start the binocular balance inspection. FIG. 6 is a diagram for explaining the inspection state at this time. Polarizing plates 90 whose polarization axes are orthogonal to each other are inserted in the left and right inspection windows of the subjective refractive power inspection device 2. The polarized optotype 91 projected by the optotype presenting device 4 includes a polarized optotype group 91a having a polarization axis in the same direction as the right eye in the upper stage, a polarized optotype group 91b having an axis in the same direction as the left eye in the lower stage, The target group 91c having no polarization characteristic is provided in the middle stage. Thereby, the upper eye and the middle eye can be seen by the right eye and the lower eye and the middle eye group can be seen by the left eye, and the visual acuity balance of the left and right eyes can be inspected by comparing the appearances of the upper eye and the lower eye.

At the time of the binocular balance test, a predetermined degree of power is added to both eyes so that the visual acuity of the subject is about 0.7 to 0.8, and a cloud is applied. This cloud amount is based on the low visual acuity value of the left and right eyes at the time of complete correction,
It is obtained from the table of the relationship between the visual acuity value and the amount of fog shown in FIG. 7 (when the visual acuity value by the completely corrected value is 0.8 or less, no fog is generated). This table table is stored in the memory 51 in advance. FIG. 8 is a diagram showing an example of a display screen at the start of the binocular balance test, and the lower display unit 80 in the central display unit 80.
The amount of cloud is displayed in b.

The procedure for the binocular balance test is as shown in the flow chart of FIG.
Explain using charts. The examiner causes the examinee to see the optotype 91 shown in FIG. 6 and inspects the balance of the visibility of the left and right eyes. If the balance between the two is not good, use the measurement eye designating switch group 37, etc.
Balance correction is performed by adding the spherical power of. The display screen is switched as shown in FIG. 10 according to the designation of the right eye or the left eye, and the naked eye visual acuity value and the visual acuity value of eyeglasses obtained by the previous examination are displayed on the lower display portion 80b. When the balance correction eliminates the difference in appearance between the two eyes, the next inspection is performed. When the corrected eye becomes difficult to see as a result of the balance correction, the person who has the spectacles gives priority to the person who has good spectacles' eyesight, and the person who is the first wearer gives priority to the person who has good optics eyesight. Since the information of the visual acuity value of the naked eye and glasses is displayed on the screen, the examiner can immediately make a judgment. It should be noted that since the determination of balance priority may be made based on the interest, the interest information may be input in advance and stored in the memory and displayed on the screen.

When the balance adjustment of both eyes is completed, the examiner presses the feed switch to proceed to the next inspection program, the stereoscopic inspection. The switch signal causes the apparatus to cancel the cloud command issued during the binocular balance test, and the display screen of the display 30 displays a message indicating that the cloud has been cleared. This allows the inspector to reliably remove the fog and proceed to the next inspection. Further, since it is possible to know the state of cloud release, it is possible to prevent an operation error such as performing a switch operation for cloud removal without knowing the contents of the cloud release program. The examiner determines a prescription value by performing a stereoscopic examination, distance diopter adjustment, near vision examination, and the like according to the optometry program. The inspection result is output from the printer, the final confirmation is made with the temporary frame, and the prescription is completed. The fog display of the present invention is not limited to the binocular balance inspection, but can be used when an eye to be inspected is subjected to fog such as an R / G test.

[0029]

As described above, according to the present invention,
Since an appropriate amount of fog is set in the binocular balance test, even an inexperienced examiner can perform an accurate test. Further, since the information on the applied cloud amount, the naked eye visual acuity value, and the spectacle visual acuity value is displayed on the display means, the examiner can easily make a judgment regarding the examination. Furthermore, when shifting from the binocular balance test to the next test, the device cancels the applied cloud amount, so that the examiner can surely perform the next test in a state in which the cloud is released. In addition, since the information for releasing the fog is displayed by the display means, it is possible to prevent an erroneous operation for releasing the fog. Furthermore, since the present device displays the applied amount of fog on the display means and informs the examiner in the inspection that requires fog fog, it is possible to prevent an erroneous operation regarding the fog adjustment.

[Brief description of the drawings]

FIG. 1 is an external view showing the overall configuration of an optometry apparatus that is an embodiment.

FIG. 2 is a view of the controller as viewed from above.

FIG. 3 is a block diagram for explaining control of the device.

FIG. 4 is a flow chart for explaining the programmed optometry of this apparatus.
It is a chart.

FIG. 5 is a diagram showing an example of a display screen at the time of an objective correction value confirmation test.

FIG. 6 is a diagram illustrating an inspection state during a binocular balance inspection.

FIG. 7 is a diagram showing a table of the relationship between the visual acuity value and the amount of fog.

FIG. 8 is a diagram showing an example of a display screen at the start of a binocular balance test.

FIG. 9 is a diagram showing a flow chart of a binocular balance inspection procedure.

FIG. 10 is a diagram showing an example of a display screen that switches when balance correction is performed.

[Explanation of symbols]

 2 Conscious refractive power measuring device 10 Display 36 Measurement mode changeover switch group 41 Program execution switch group 50, 60, 70 Microcomputer circuit 51, 52 Memory 62 Motor 63 Weak spherical disk 64 Strong spherical disk 65 Auxiliary Lens disc 66 Cross cylinder-disc

Claims (9)

[Claims] 1. An optometry apparatus equipped with a subjective refracting power measuring apparatus having a correction optical system for applying refractive power to an eye to be inspected and a driving means for driving the correction optical system. Complete correction value determining means for making a correction to a completely corrected state, visual acuity measuring means for measuring the visual acuity value of the eye to be examined in the completely corrected state, and reducing the visual acuity value of the eye to be examined in the completely corrected state to a predetermined visual acuity value An addition power determining means for determining a power to be added to the eye to be examined, and a control means for controlling the driving means to add the addition power determined by the addition power determining means to the eye to be examined. And an instruction signal generating means for giving a control instruction to the control means. 2. The optometry apparatus according to claim 1, wherein the command signal generating means is a switch for starting a binocular balance test. 3. The eye examination apparatus according to claim 2, further comprising visual acuity information display means for displaying at least one of the naked eye visual acuity value obtained by the naked eye visual acuity test or the front spectacle visual acuity obtained by the spectacle visual acuity test. Optometry device. 4. The optometry apparatus according to claim 1, wherein the additional power determining means has a table of a relationship between the visual acuity value and the additional power when completely corrected. 5. The optometry apparatus according to claim 1, wherein the additional power determination means determines the low visual acuity values of the left and right eyes when completely corrected as a reference. 6. The optometry apparatus according to claim 1, further comprising additional power display means for displaying the additional power determined by the additional power determining means. 7. The optometry apparatus according to claim 1, further comprising cancellation signal generating means for canceling the addition of the frequency when the examination of a predetermined examination item is completed. 8. The optometry apparatus according to claim 7, wherein the release signal generating means is a shift switch that shifts to the inspection of the next inspection item. 9. An eye examination apparatus having an subjective refracting power measuring apparatus having a correction optical system for applying a refracting power to an eye to be examined and a driving means for driving the correction optical system. Complete correction value determining means for making a correction to a completely corrected state; power adding means for adding a power to the eye to reduce the visual acuity value of the eye to be inspected in the completely corrected state to a predetermined visual acuity value; An optometry apparatus comprising: a display unit that displays the power added by the power addition unit.