CN102397053A - a visual acuity chart - Google Patents

Abstract

The invention discloses a vision measurement chart, comprising a box and a vision chart, the box is a rectangular parallelepiped structure, the box thickness is about 5 cm, an illumination light source is arranged in the box, the vision chart is arranged on the surface of the box, the vision chart has 14 rows of sight marks, each row from the first row to the eleventh row is provided with 9 sight marks, the twelfth row is provided with 7 sight marks, the thirteenth row is provided with 3 sight marks, the fourteenth row is provided with 1 sight mark, each row of sight marks is arranged symmetrically and regularly, and all sight marks are evenly distributed in a three-dimensional manner from large to small. By adopting the embodiment of the invention, a vision measurement chart with more accurate detection, wider application, more scientific design, and more in line with human visual physiological response can be obtained.

Description

a visual acuity chart

technical field

The invention relates to a visual acuity measurement table.

Background technique

The visual acuity measurement chart is a standard tool used to detect the degree of people's vision. The visual targets of the existing visual acuity measurement charts are generally in a flat design, and the visual targets below 0.3 are too few, which are easy to be remembered by the tester, resulting in poor detection methods. Science, difficult to judge, inaccurate test results.

Contents of the invention

In view of this, the object of the present invention is to provide a visual acuity measurement table with a more scientific design.

In order to achieve the above object, the technical scheme of a visual acuity meter of the present invention is: comprising a box body and a visual acuity chart, the box body is a cuboid structure, the thickness of the box body is about 5 centimeters, an illumination light source is arranged in the box body, and the visual acuity chart is set On the surface of the box, according to the design principle of 1-point viewing angle, there are 14 rows of visual targets in the eye chart. There are 9 visual targets in each row from the 1st row to the 11th row, 7 visual targets in the 12th row, and 7 visual targets in the 13th row. There are 3 optotypes in the row, and 1 optotype in the 14th row. The optotypes in each row are symmetrically arranged up and down, and all the optotypes are uniformly distributed in a three-dimensional manner from large to small.

The box body includes a hanging type and a table type.

The illumination light sources include LED light sources and common light sources.

The optotypes are arranged centrally and symmetrically.

The beneficial effects of the visual acuity measurement chart of the present invention are: more accurate detection, wider application, more scientific design, and more in line with human visual physiological responses.

Description of drawings

Fig. 1 is the structural representation of a kind of visual acuity measuring table of the present invention;

【Description of figure number】

1 Box 2 Eye chart twenty one Optotype

Detailed ways

As shown in Fig. 1, the technical scheme of a kind of visual acuity measuring table of the present invention is: comprise box body 1 and eye sight table 2, this box body 1 is cuboid structure, and box body 1 thickness is about 5 centimetres, and lighting is provided in box body 1 Light source, the eye chart 2 is arranged on the surface of the box body 1, and the eye chart 2 has 14 rows of visual marks 21 in total, with 9 visual marks 21 in each row from the first row to the 11th row, and 7 visual marks 21 in the 12th row 21. The 13th row is provided with 3 optotypes 21, and the 14th row is provided with 1 optotype 21. Each row of optotypes 21 is arranged symmetrically up and down, and all the optotypes 21 are evenly distributed in a three-dimensional manner from large to small. The box body 1 includes a hanging type and a table type. The illumination light source includes LED light source and common light source. The visual marks 21 are arranged symmetrically to the center.

In this specific embodiment, as shown in Figure 1, after starting the lighting source in the box body 1, the visual marks 21 arranged symmetrically and three-dimensionally on the eye chart 2 are fully presented in front of the subject. The visual marks 21 of 2 are arranged in a three-dimensional form from large to small, so that it is more in line with the visual physiological response of the person being tested, and the detection method is more scientific. In addition, since the first row to the eleventh row are equipped with nine visual marks 21 in each row, This makes it impossible for the subject to remember the order in which each row of visual marks 21 is arranged, thereby making the detection result more accurate.

The above description of the present invention and shown in the accompanying drawings are one of the preferred embodiments of the present invention, and are not intended to limit the present invention. Therefore, for example, those who are similar and identical to the visual mark arrangement and appearance features of the present invention, All should belong to the creation purpose of the present invention and within the scope of the patent application.

Claims (4)

1. A visual acuity measuring table is characterized in that: comprise casing and visual acuity chart, this casing is cuboid structure, and casing thickness is about 5 centimetres, and lighting source is established in the casing, and this visual acuity chart is located at casing surface, There are 14 rows of visual targets in the eye chart, with 9 visual targets in each row from the 1st row to the 11th row, 7 visual targets in the 12th row, 3 visual targets in the 13th row, and 3 visual targets in the 14th row. 1 visual target, each row of visual targets is arranged symmetrically up and down, and all visual targets are evenly distributed in a three-dimensional manner from large to small. 2. A visual acuity measuring instrument according to claim 1, characterized in that: said box includes a hanging type and a table type. 3. The visual acuity meter according to claim 1, characterized in that: said illumination light source comprises LED light source and common light source. 4. A visual acuity measuring chart as claimed in claim 1, characterized in that: said optotypes are arranged symmetrically about the center.