JP2003061910A - Vision examination chart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vision examination chart capable of simultaneously and simply performing a plurality of vision examinations items, facilitating carrying, without requiring a large installation type apparatus, nor a space and special environment for examination like a semi-dark room which is an examination apparatus taking light as an index, and examined in a designated posture, and easily examining a patient even if he can't rise. SOLUTION: This examination chart 1 is formed by lattice indexes 3 of lattice stripes in which square lattices are arranged in vertical and horizontal directions, and circular indexes 4 displayed in the respective lattices of the lattice indexes 3. The insides of the circular indexes 4 are colored in hue different from the background.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection chart used for inspecting visual field disorders, metamorphopsia, color blindness, etc. which appear in cases of eye diseases such as retina and optic nerve or intracranial diseases. In particular, the present invention relates to an inspection chart that enables easy detection of initial symptoms, observation of progress, and the like.

[0002]

2. Description of the Related Art Visual inspection is important not only for ophthalmology for diagnosing diseases such as the retina and optic nerve, but also for neurology and brain surgery for diagnosing intracranial diseases. Inspection tables are used.

[0003]

However, in the inspection method using the apparatus and the inspection table that have been used conventionally, the number of items that can be inspected by one apparatus or the inspection table is limited to one type,
For example, when inspecting multiple items such as metamorphopsia and color vision test, it is necessary to inspect using multiple devices and inspection tables, which takes time and labor, and is troublesome for the subject. He needed to stay focused and was tired.

Moreover, when the conventional inspection device or inspection table is used, the subject himself cannot notice the abnormal portion,
It was difficult to understand my symptoms.

Further, since the conventional inspection apparatus is a stationary type extremely large apparatus, it is difficult to carry it, and when an inspection apparatus using a visual target as light is used, it becomes a semi-dark room. It required a space and environment dedicated to inspection. Therefore, the examinee cannot take the examination unless he goes to the place where the examination apparatus is installed and maintains a predetermined posture, and it is extremely difficult for the patient who cannot stand up to take the examination.

[0006] Furthermore, patients who are not aware of the initial symptoms of each disease that causes visual impairment are ill until the symptoms are advanced and the subjective symptoms appear and they are examined by an ophthalmologist and diagnosed. Because I do not know that I have
There is a problem that early detection of the disease is difficult.

The present invention has been made in order to solve the above problems, and provides an inspection chart capable of simultaneously and easily performing visual inspection of a plurality of items.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention provides a grid optotype consisting of grid stripes in which square grids are arranged in parallel in the vertical and horizontal directions, and a circular optotype displayed in each grid of the grid optotype. And the inside of the circular target was colored with a hue different from the background color.

Using the present invention, it is examined whether or not the inspection chart is missing or disappears, the grid target is not distorted, and whether the circular target is correctly colored. It is possible to examine the presence or absence of visual field disorder, metamorphopsia, and color blindness in and around the center, respectively.

Further, by coloring the circular optotypes in a vertical stripe pattern and using various color tones, a detailed color vision test can be performed.

[0011] Then, self-diagnosis can be performed by checking the display contents of each optotype in advance, and self-diagnosis is also possible. By installing or distributing such an inspection chart at an appropriate place, the ophthalmology It can be useful for early detection of diseases.

Further, since the inspection chart of the present invention can be produced by printing on the plate surface of the mount such as paper or synthetic resin, it is inexpensive and can be easily carried, so that it is possible to carry out a group examination or a home visit. In addition, it is possible to perform a visual examination at any place, and even a bedridden patient can easily undergo the examination.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. An inspection chart 1 consisting of an inspection plate 11 is printed on a plate surface 10 of a mount made of synthetic resin and having a size of about A3 size. Inspection table 2 is displayed on a yellow background.

The inspection table 2 is, as shown in FIG. 2, a grid index 3 consisting of black grid stripes displayed so that seven square grids 31 are arranged in each of the vertical and horizontal directions, and each grid. The circular optotype 4 is arranged inside 31 and is colored with various tones. Then, the central lattice 310 is surrounded by a line thicker than the other lattice stripes, and the central circular optotype 40 displayed therein is a fixation target.
The fixation target is the circular target 40 in the central lattice 310,
The circular target 4 may be colored with a distinctive hue such as red.

The circular optotype 4 is colored, for example, with different hues and shades, and with the same yellow color as the background and a different color from the background, for example, a vertical stripe pattern of two colors of blue. Furthermore, each circular target 4 is used by changing its color and shading, and each vertical striped pattern has two colors forming the vertical striped pattern, and the colors shift sinusoidally from one color to the other. Those that are colored so as to gradually change, or that have a gradation so that the color shifts sinusoidally are used.

Then, the examiner confirms whether or not the examinee can visually recognize the central circular optotype 40, which is a fixation target, with one eye, and thereby, for example, macular disease such as macular degeneration or optic nerve atrophy. The presence or absence of a central visual field defect caused by an optic nerve disease such as the above is examined, and whether or not the entire one inspection table 2 can be visually recognized without interruption is examined.

At the same time, the presence or absence of metamorphopsia due to macular disease or the like is examined by checking whether the lattice fringes of the lattice optotype 3 are distorted and not visible, and the circular optotypes 4 colored in different colors are examined. By checking whether or not the difference in color and the presence or absence of the vertical stripe pattern can be visually recognized, it is possible to inspect the presence or absence and the type of color vision abnormality.

Since the above-mentioned inspection table 2 is symmetrically arranged around the central circular optotype 40 which is a fixation target, both the left and right eyes can be inspected in the same manner and semi-blind. Can be inspected for Also,
By arranging them vertically symmetrically, the inspection can be performed under the same conditions for the upper and lower visual fields.

The procedure of visual inspection using the visual inspection chart 1 will be described below.

The subject first looks at the entire examination chart 1 or the instructions thereof with both eyes in advance and confirms the arrangement and conditions of each optotype. After that, at an appropriate distance from the plate 10, for example, at a position of about 40 cm, one eye is covered with a dedicated eye patch or palm to close the eye, and the eye on the inspection side gazes at the central circular optotype 40 vertically from the front. Then, it is confirmed whether or not the central grid 310 and the circular optotype 40 in it can be seen correctly.

Next, it is confirmed whether or not there is any distorted, hazy, or disappeared portion in the entire grid optotype 3 or the circular optotype 4 does not disappear. Also,
Check whether the colored or vertical stripe pattern of the circular optotype 4 can be visually recognized correctly, and whether or not there is any part that has disappeared. In this way, the presence or absence of central and peripheral visual field defects, hemiblindness, metamorphopsia, congenital red-green abnormalities, or acquired color blindness abnormalities such as blue-yellow abnormalities due to optic nerve disorders can be examined.

During the examination, the subject is always careful to keep his eyes on the circular optotype 40 in the center, and be careful that the examination is performed at the correct position. If an examiner is present, speak constantly during the examination to draw attention to the subject's eye position.

The visual inspection according to the present invention is performed by the above-mentioned procedure, unlike the conventional inspection method, does not require a large-scale device or a large number of inspection charts. It doesn't require any technology, so
In addition to ophthalmology, in order to diagnose the symptoms of brain disease that causes visual impairment, it can be easily examined in clinical departments such as neurology and brain surgery.

Further, the visibility is clear, and the subject himself or herself can recognize and recognize the abnormal portion at the time of the examination by checking the arrangement and conditions of the visual targets before the examination.

Moreover, since it can be manufactured at a low price by printing it on a synthetic resin plate or paper, the inspection chart 1 of the present invention can be installed in a waiting room such as a medical institution or a pharmacy, or can be used in a general workplace or home. If distributed, it can be used by the subject for self-diagnosis and early detection of visual impairment. In particular, since the initial visual field disorder often occurs from the center, it can contribute to the discovery of initial symptoms.

Further, since the inspection chart 1 of the present invention is small and lightweight, the examiner or the like lifts the inspection plate to adjust the position, so that the inspection can be performed without changing the posture of the subject. Therefore, for example, even a patient lying down due to a brain disease or the like can easily undergo the examination.

[0028]

According to the present invention, the visual inspection of a plurality of items can be performed at the same time, so that the inspection time can be shortened and the fatigue of the examinee can be reduced as compared with the prior art.

Further, since the circular optotypes of each examination table are displayed in different color tones, the cause or symptom of the color vision abnormality can be diagnosed, and it is easy to judge whether or not the color vision is visually recognized, and the subject himself / herself detects the abnormality. You can be aware of it.

Further, since the examiner does not need to have a high level of specialized knowledge and skill, it is possible to perform a simple and detailed examination not only in the ophthalmology department but also in other medical departments and places other than medical institutions.

Furthermore, since the inspection chart of the present invention can be manufactured at low cost, anyone can easily inspect it by installing or distributing it in various places. Therefore, it is useful for early detection and follow-up of eye and brain diseases that cause visual impairment.

Further, the examination chart of the present invention can be easily carried around and can be carried to the examination place, the home visit, etc., and the examination environment and the posture of the subject do not matter. Can also be easily inspected.

[Brief description of drawings]

FIG. 1 is a front view showing a preferred embodiment of the present invention.

FIG. 2 is an enlarged front view of the inspection table of FIG.

[Explanation of symbols]

1 inspection chart, 2 inspection table, 3 grid optotype, 4
Circular optotype, 10 plate, 11 inspection plate, 31 grid

Claims (5)

[Claims] 1. A grid optotype consisting of grid stripes in which square grids are arranged in parallel in vertical and horizontal directions, and a circular optotype displayed in each grid of the grid optotype, and the inside of the circular optotype is included. However, the chart for visual inspection is characterized by being colored in a hue different from the background color. 2. The visual inspection chart according to claim 1, wherein the circular target is colored in a vertical stripe pattern of two kinds of color tones. 3. The visual inspection chart according to claim 2, wherein the vertical stripe pattern is formed by sinusoidally shifting from one color to the other color. 4. The chart for visual inspection according to claim 1, wherein the coloring pattern and the color tone of the circular target are different from each other. 5. The visual inspection chart according to claim 1, 2, 3, or 4, wherein the inspection chart is printed on a printing plate.