JP2006212103A - Visual performance examination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a visual performance examination apparatus for quantitatively examining and measuring a visual performance disorder. <P>SOLUTION: The visual performance examination apparatus comprises: a display means for displaying a visual target to be presented to an eye to be examined; and a visual target formation means for arraying the visual target with high luminance to the background luminance of an examination image at the display means together with a gauge for quantitatively confirming the visibility of the visual target or the plurality of visual targets with the high luminance to the background luminance of the inspection image so as to be in a prescribed shape for quantitatively confirming the visual performance disorder that the eye to be examined has and forming the examination visual target on the inspection image at the display means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a visual function testing device capable of quantitatively measuring night vision dysfunction of an eye to be examined.

Conventionally, in order to quantitatively measure how much night vision is, after illuminating the subject's eye with illumination light for a certain period of time and making it light-adapted, the illumination light is turned off and a target that is presented at low illumination An apparatus that measures night vision by measuring a discriminable time is known (see Patent Document 1). In recent years, a technique for changing the refractive power of the eye by correcting the curvature of the cornea using an excimer laser or the like is known. By performing such a refractive surgery, corrective visual acuity is improved, but on the other hand, visual impairment has been reported in which light blur (halo) and coma aberration occur at night, making it difficult to see.
Japanese Patent Laid-Open No. 11-178794

The apparatus for measuring night vision as disclosed in Patent Document 1 does not have the function of quantitatively measuring the visual impairment mentioned above, and quantitatively examines and measures visual impairment such as halo. The current situation is that it is not possible.
In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a visual function inspection device capable of quantitatively inspecting and measuring visual function disorders.

In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) Display means for displaying a target to be presented to the eye to be examined, and a target having a high brightness relative to the background brightness of the inspection screen of the display means for quantitatively confirming the appearance of the target Arranged so that the visual function impairment of the eye to be examined can be quantitatively confirmed with a scale or a plurality of targets having high brightness with respect to the background brightness of the inspection screen, And visual target forming means for forming an inspection visual target on the inspection screen of the display means.
(2) The visual function inspection device according to (1) further has a predetermined luminance for miosis of the eye to be examined in at least a partial region of the background of the inspection screen that does not cover the target formed on the display means. It has the illumination part formation means for forming the illumination part which has.
(3) The visual function inspection device according to (2) is characterized by having a luminance changing unit for changing the luminance of the illumination unit formed on the inspection screen by the illumination unit forming unit.
(4) In the visual function inspection device of (1), the shape for quantitatively confirming the appearance of the target is defined as one target formed at the center of the inspection screen and centered on the target. It is a shape having scales arranged concentrically at intervals.
(5) In the visual function testing device of (1), the shape for quantitatively confirming the appearance of the target is a shape formed by arranging a plurality of targets having the same shape in a V shape. It is characterized by being.

  According to the present invention, visual impairment such as halo can be quantitatively examined and measured.

  This embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a visual function testing device according to the present embodiment. Reference numeral 1 denotes a general-purpose personal computer (hereinafter referred to as a PC), which includes a control unit 2 composed of a CPU and a storage unit 3 such as a hard disk for storing various programs. The storage unit 3 stores a visual function inspection program for inspecting (measuring) the visual function of the eye to be inspected, and the visual function test can be performed by executing this program. Reference numeral 4 denotes a display such as a liquid crystal monitor or a CRT, which is connected to the PC 1 and serves as display means for displaying a visual target for visual function inspection described later. Reference numeral 5 denotes operation means for advancing programs such as a mouse and a keyboard, and is connected to the PC 1.

  When the visual function inspection program stored in the storage unit 3 is executed by operating the operation means 5, the control unit 2 displays a predetermined inspection target on the display 4 based on the program. Note that a plurality of inspection targets to be displayed on the display 4 are prepared depending on the purpose, and are displayed on the screen of the display 4 in various ways by the operation of the operation means 5.

FIG. 2 is a diagram illustrating a first display example of the inspection target displayed on the display 4, and is a diagram illustrating a screen configuration for inspecting halo (light bleeding).
As shown in FIG. 2 (a), at the center of the inspection screen of the display 4, an inspection target 10 (circular shape in the figure) having such a size that the shape (contour) can be visually recognized, It is formed as a target with high brightness such as white. 11 is a scale, and a plurality of scales are formed on the inspection screen of the display 4 at regular intervals (90 ° intervals in the present embodiment) in the vertical and horizontal directions around the inspection target 10. On the other hand, the background 100 of the inspection screen of the display 4 is a dark screen with a low luminance such as black. In the vicinity of each scale 11, alphanumeric characters and symbols corresponding to the scale can be provided. Further, the scale 11 may be formed in a radial pattern such that the axis of the scale intersects at the center of the inspection target while having a predetermined interval such as a 45 ° interval instead of the 90 ° interval.

  When the visual function test of the eye to be examined is performed, in order to obtain the same situation as at night, the examination room is darkened and the pupil of the eye to be examined is opened as large as possible. The examiner operates the operation means 5 and executes the visual function inspection program stored in the storage unit 3. Based on the executed program, the control unit 2 darkens the background 100 of the inspection screen of the display 4 and displays the inspection target 10 and the scale 11 shown in FIG. Present the mark. The subject looks at the inspection target 10 presented on the inspection screen of the display 4 from a position away from the predetermined distance.

When the subject feels halo at night, as shown in FIG. 2B, the halo 12 is confirmed around the bright test target 10 presented on the test screen. The examiner makes the subject answer how many halos 12 appearing on the inspection target 50 presented on the inspection screen of the display 4 are on the scale 11. If alphanumeric characters or symbols are displayed in the vicinity of the scale 11, the numbers may be answered. The answer of the subject can be stored in the storage unit 3 of the PC 1 by the operation means 5 or the answer result may be entered on a predetermined sheet.
In this way, by determining the size of the halo 12 confirmed on the test target 10 by the scale 11, the degree of visual dysfunction of the subject (eye to be examined) can be quantitatively examined.
In addition, an illuminating unit composed of a bright image for reducing the eye to be examined by a predetermined amount can be formed on the examination screen of the display 4 using the operation means 5. FIG. 3 is a diagram illustrating a configuration in which the illumination unit 13 is formed on the inspection screen illustrated in FIG.

  When a signal indicating that the illumination unit 13 is to be formed on the inspection screen of the display 4 is sent to the control unit 2 using the operation unit 5, the control unit 2 images the illumination unit 13 having the luminance set at a predetermined position on the inspection screen. Form as. In this embodiment, as shown in FIG. 3, the circular illumination portions 13 are formed at the four corners of the examination screen. However, the present invention is not limited to this, and the background luminance of the screen is changed to reduce the eye to be examined. In order to make it pupil, it may be formed in various shapes at a predetermined position on the examination screen at least not on the examination target 10. Further, the pupil of the eye to be examined may be adjusted by adjusting the light amount of the entire display.

  Note that the luminance of the illumination unit 13 formed on the inspection screen in this manner can be variously changed by operating the operation means 5. For example, a keyboard serving as the operation means 5 is operated, a brightness setting screen of the illumination unit is called on the screen of the display 4, and the brightness may be set by operating a mouse or a keyboard. Such setting can be performed before the examination or during the presentation of the examination target.

  As shown in FIG. 3, when the illumination unit 13 having a predetermined luminance is formed on the examination screen of the display 4, the eye to be inspected is reduced by a predetermined amount. By confirming the range of the halo applied to the scale 11 in such a state, it is possible to know whether the phenomenon of aberration due to miosis affects the appearance. As described above, the response of the subject can be stored together with the luminance value set in the storage unit 3 of the PC 1 by the operation means 5, or the response result may be entered on a predetermined sheet.

  The visual function inspection device of this embodiment does not present an inspection target with a low brightness and a bright background, and does not perform the inspection as in a generally known visual acuity inspection device, but has a low luminance. By adopting a configuration in which a bright test target is presented in the background, it is possible to effectively extract the visual function impairment of the eye to be examined, and to inspect and measure the visual function quantitatively.

Next, a second display example of the inspection target displayed on the display 4 is shown in FIG. 20 is an inspection target (target group) formed by arranging a large number of elliptical targets 22 in a horizontal V shape, and 21 is formed by arranging a large number of elliptical targets 22 in a vertical V shape. Inspection target (target group). The inspection target 20 is used when quantitatively determining the coma in the vertical direction of the eye to be examined, and the inspection target 21 is used when quantitatively determining the coma in the horizontal direction.
4 have the same elliptical shape, and are arranged so that the major axis of the ellipse faces in the direction in which the targets arranged in a V shape face each other as illustrated. . Each elliptical target 22 is a bright target with high brightness such as white, while the background 100 of the inspection screen of the display 4 is a dark screen with low brightness such as black as described above.

  When the visual function test of the eye to be examined is performed, the examination room is darkened so that the pupil of the eye to be examined is opened as large as possible in order to achieve the same situation as at night. The examiner operates the operation means 5 and executes the visual function inspection program stored in the storage unit 3. Based on the executed program, the control unit 2 darkens the background 100 of the inspection screen of the display 4 and displays the inspection target 20 and the inspection target 21 shown in FIG. 4 so that the subject can see the inspection target. Present. The subject looks at the inspection visual target 20 and the inspection visual target 21 presented on the inspection screen of the display 4 from a position separated by a predetermined distance.

  When coma aberration occurs in the eye to be examined in the vertical direction or the horizontal direction, the image of the ellipsoidal target 22 flows, the ellipse becomes large, and the opposing ellipsoidal targets 22 appear to overlap each other. The examiner shows how many elliptical targets 22 appear to overlap each other from the right (or left) for the inspection target 20, and what from the bottom (or top) for the inspection target 21. The subject is made to answer whether the ellipsoidal targets 22 appear to overlap each other at the stage. The answer of the subject can be stored in the storage unit 3 of the PC 1 by the operation means 5 as described above, or the answer result may be entered on a predetermined sheet.

In this way, by checking how many elliptical targets 22 appear to overlap each other on the inspection target 20 and the inspection target 21 presented on the inspection screen of the display 4, the frames of the eye to be examined are included. It becomes possible to inspect the degree of aberration quantitatively. In addition, by using such an inspection target, it is possible to intuitively capture direct astigmatism and astigmatism.
In the second display example of the present embodiment, the background of the inspection screen of the display 4 is darkened, and bright elliptical targets are continuously arranged in two rows on the background, and the opposing elliptical targets are faced. Although it is set as the structure arrange | positioned in V shape which consists of changing the space | interval of mutual, it is not restricted to this. It has the shape and arrangement of a target that can quantitatively measure the image flow due to coma aberration while the background brightness of the inspection screen is low and the brightness of the inspection target is sufficiently high relative to the background brightness. Just do it.

Next, a third display example of the inspection target displayed on the display 4 is shown in FIG. FIG. 5 is a view for inspecting a star bust (light appears to be repelled) that is likely to occur in the patient's eye after surgery after performing a refractive correction by cutting the cornea radially such as RK (radical keratomy). It is the figure which showed the screen structure. As described above, the background 100 of the inspection screen is a dark screen with low brightness, and an inspection target composed of a target group in which a plurality of targets 31 imitating small luminescent spots are arranged in a V shape near the center thereof. 30 is formed. Each visual target 31 has the same shape, and is formed of a high-luminance visual target, such as white, in the same manner as the inspection visual target shown in other figures. The test target 30 formed in this way is presented to the subject to check starbust. As the inspection target, it is possible to present only one target 31 on the inspection screen of the display 4, but by presenting the inspection target in such a V-shaped arrangement, There is an advantage that eyes with large aberrations are easily conscious.
Further, in the examination screens shown in FIG. 4 and FIG. 5, it is needless to say that the illumination unit as shown in FIG.
Furthermore, as another configuration of the inspection screen, it is possible to present a bright and small target with a dark background and answer the target's shape and size.

It is the block diagram which showed the control system of the visual function test | inspection apparatus in this embodiment. It is the figure which showed the 1st example of the test | inspection screen in this embodiment. It is the figure which showed the example which displayed on the test | inspection screen the illumination part for reducing the eye to be examined. It is the figure which showed the 2nd example of the test | inspection screen in this embodiment. It is the figure which showed the 3rd example of the test | inspection screen in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Personal computer 2 Control part 3 Memory | storage part 4 Display 5 Operation part 10 Inspection target 11 Scale 100 Screen background

Claims (5)

A display means for displaying a visual target to be presented to the eye to be examined, and a scale for quantitatively confirming the visual appearance of the visual target having a high brightness relative to the background luminance of the inspection screen of the display means, Alternatively, by arranging a plurality of targets having high luminance with respect to the background luminance of the examination screen so as to have a predetermined shape capable of quantitatively confirming visual function impairment of the eye to be examined, A visual function inspection device comprising: a visual target forming unit that forms a test visual target on an inspection screen. The visual function testing device according to claim 1, further comprising an illuminating unit having a predetermined luminance for miosis of the eye to be examined in at least a partial area of the background of the examination screen that does not cover the target formed on the display unit. A visual function inspection device comprising an illumination unit forming means for forming a visual function. 3. The visual function inspection device according to claim 2, further comprising a luminance changing unit for changing the luminance of the illumination unit formed on the inspection screen by the illumination unit forming unit. 2. The visual function testing device according to claim 1, wherein the shape for quantitatively confirming the visual appearance of the visual target is one visual target formed at the center of the inspection screen and at a predetermined interval around the visual target. A visual function testing device characterized by having a shape having scales arranged concentrically. 2. The visual function testing device according to claim 1, wherein the shape for quantitatively confirming the appearance of the target is a shape formed by arranging a plurality of targets having the same shape in a V shape. A visual function testing device.