JPH06218005A - Visual acuity corrective device for cataractous patient - Google Patents

Abstract

PURPOSE:To obtain a visual acuity corrective device for cataractous patient by providing a small hole through which light passes at a position in a light screen plate with which an eyeball is brought into contact. CONSTITUTION:A small hole 1 is provided at a position in a light screen plate 2 with which an eyeball is brought into contact and a surrounding cover 3 is provided on the circumference of the light screen plate 2. Amt. of light is suppressed outdoors in daytime by passing light through only one point of the small hole 1 and irregular reflection of a lens is suppressed to the minimum by intercepting light coming from the area except a visual point to be able to improve the visual acuity to the visual point. In addition, the smaller the diameter of the small hole is, the amt. of light can be suppressed and the irregular reflection of the lens can be suppressed and visual acuity to the visual point can be improved but as the diameter of the small hole becomes smaller, the field of vision is made narrower and, therefore, the size of the small holes 1 is made different in accordance with the degree of impediment of the patient and the difference of use.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vision corrector for cataract patients.

[0002]

2. Description of the Related Art Cataract is an eye disease that causes the crystalline lens in the eye to become cloudy and obstructs the transmission of light, thereby reducing the visual acuity. The most common cause of this is aging of the lens, and it is called senile cataract because it is common among the elderly. In addition, it may be caused by diabetes,
It may develop due to trauma to the eyes or due to atopic dermatitis.

When cataract is detected early, the progression of opacity of the crystalline lens can be suppressed to some extent by eye drops, but the current medical technology cannot completely stop the progression. Then, as the progress progresses, the visual acuity gradually decreases, and finally the visual acuity is completely lost. The speed of this progression varies from person to person, but in the case of senile cataract, it may take decades before blindness. Finally, surgery allows the lens to be removed and the visual acuity restored. However, surgery is only the last resort, and it is usual that surgery is not performed until the deterioration of visual acuity significantly affects daily life. Although it has become considerably safer due to advances in medical technology, it is because the risk of blindness is associated with failure of surgery, and the burden on the patient's body due to surgery is considerable.

This is especially important as cataracts are especially prevalent in the elderly. That is, although the visual acuity is considerably lowered, the burden on the body is large due to aging and there are many cases where the operation cannot be completed. Cataract is characterized by the fact that it can be seen relatively well in a dark place such as indoors, but is difficult to see outdoors during a daytime. The inventor himself once suffered from cataract, and when the indoor visual acuity was 0.6, it was 0.2 outdoors. At this level of disability, you can barely walk outdoors, but if your visual acuity indoors progresses to around 0.4, your visual acuity is 0.1 outdoors.
It is usually the following.

Further progressing makes it even more difficult to read nearby prints. Especially in senile cataract, the progression is slow,
This kind of situation continues for many years. In this way, the visual acuity of cataract patients especially decreases outdoors during daylight, etc., because when the amount of light entering the eye is large, there is a lot of diffused reflection in the crystalline lens, and the entire visual field becomes white and foggy, resulting in a marked decrease in visual acuity. This is because. Actually, cataract patients wear sunglasses outdoors or wear hats with collars to prevent the loss of visual acuity by directly controlling the light that shines directly on the eyes. It is what

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a vision correction device for a cataract patient which minimizes the visual acuity deterioration of the cataract patient outdoors and improves the visual acuity when reading a type such as a newspaper. Is.

[0007]

DISCLOSURE OF THE INVENTION The present invention has a small hole (1) through which light passes only in the central portion of a shading board (2), at a position where an eyeball hits, and around the shading board (2) and small holes. The parts other than (1) are characterized by a structure in which light is shielded by the peripheral cover (3). The small holes (1) vary in diameter from about 5 mm to 1 mm or less depending on the degree of disability of the cataract patient.

[0008]

[Function] By passing light from only one point of the small hole (1), the amount of light is suppressed even in the daytime outdoors, and the light coming from other than the viewpoint is blocked to minimize diffuse reflection of the crystalline lens. Can improve eyesight. It should be noted that the smaller the small hole (1), the smaller the amount of light and the less diffuse reflection of the crystalline lens and the higher the visual acuity to the viewpoint, but the smaller the small hole (1), the narrower the small hole (1). The degree depends on the degree of disability of the patient and the use thereof.

[0009]

EXAMPLE An example of the present invention will be described below with reference to FIG. A small hole (1) with a diameter of 2 mm is made in the center of a circular black plastic shading board (2) with a diameter of 40 mm and a thickness of 1 mm that does not allow light to pass, and the thickness of the shading board (2) around which light does not pass. A black vinyl peripheral cover (3) having a width of 0.5 mm and a width of 10 mm was vertically bonded along the circumference of the light shielding plate (2).

The following table shows the results of a visual acuity test conducted by using the corrective device for eyesight as an eye patch. (A) General visual acuity test A. Patients with mild cataracts Indoors Outdoors Outdoor naked eye 0.6 0.2 Sunglasses 0.5 0.3 Eye patch 0.7 0.5 B. Patients with severe cataract symptoms Indoors Outdoors Outdoors naked eye 0.3 0.01 Sunglasses 0.2 0.05 Eye patch use 0.4 0.3 (b) Short-distance character discrimination survey A. Patients with mild cataract symptom Indoor newspaper type reading dictionary type reading legible naked eye yes no eye patch use yes yes Patients with severe cataract symptoms Indoor newspaper type reading Dictionary type reading Reading with naked eyes No No Eye patch use Yes Yes

A patient with weak cataract had a visual acuity of 0.6 indoors, but a large visual acuity of 0.2 outdoors, but
It was possible to secure a visual acuity of 0.5 using the eye patch. In addition, a patient with strong symptoms and indoor vision of 0.3 had an outdoor condition of 0.01, which made it very difficult to even walk on the road with complete blindness, but by using this eye patch, 0.3 could be secured. Although I had some difficulty, I was able to manage to walk on the road. Although this patient was unable to read newspaper prints with the naked eye, the use of the eye patch made it possible to read small prints such as mail, although the visual field was narrow and a large amount of prints could not be read quickly.
For reference, the visual acuity when wearing sunglasses is shown. With sunglasses, the effect of improving visual acuity outdoors was very small, but was insufficient.

In this embodiment, a plastic plate is used as the shading board. However, when it is necessary to correct myopia at the same time, a black paint is applied to the surface of the spectacle lens for myopia correction to form a shading board, and It is possible to put a small hole through the light at the eye without passing paint.

[0013]

[Effects of the Invention] By using the present vision correction device for cataract patients, it is possible to minimize the deterioration of the visual acuity of the cataract patients outdoors.
In addition, it can improve visual acuity when reading typefaces such as newspapers, which greatly enhances the functionality of cataract patients and helps them in their daily lives.

[0014]

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a side view showing a state in which the present invention is worn on an eye.

[Explanation of symbols]

1 ... Shading board 2 ... Small hole 3 ... Peripheral cover

Claims (2)

[Claims] 1. A vision correction device for a cataract patient characterized by having a small hole (1) at a position where an eyeball hits in a light-shielding plate (2). 2. A vision correction device for a cataract patient according to claim 1, further comprising a peripheral cover (3) around the light shielding plate (2).