Visual testing chart with red-green color-blindness testing

Abstract

The invention discloses a visual testing chart with red-green color-blindness testing. The visual testing chart comprises a rectangular plate body, wherein two inserting grooves which pass through the upper end surface of the plate body are formed inside the plate body; a black inserting plate and a red inserting plate are respectively inserted into the inserting grooves; a plurality rows of E-shaped grooves which are different in size and different in direction are formed in the front end surface of the plate body; the E-shaped grooves are communicated with adjacent inserting grooves of the plate body; the front end surface of the plate body is sprayed with a green coating; a plurality of tangent grooves opposite to the E-shaped grooves are formed in the plate body between the two inserting grooves; the tangent grooves are communicated with the two inserting grooves inside the plate body. The visual testing chart is simple in structure and convenient to manufacture, and can also be used for testing red-green color-blindness on the basis of common visual testing.

Description

[0001] Technical field: [0002] The invention relates to the technical field of medical vision testing equipment, and more specifically relates to an eye chart equipped with detection of red-green color blindness. [0003] Background technique: [0004] An eye chart is a chart used to measure vision. The eye chart used in medical testing mainly checks the central vision, that is, checks the central visual acuity in the macular area of ​​the retina, so that the preliminary situation of visual function can be learned simply and quickly, which is of great significance for the clinical diagnosis and treatment of eye diseases. Although existing visual acuity charts include international standard visual acuity charts, logarithmic visual acuity charts, and Langer's ring visual acuity charts, they are generally black on a white background and only have the detection function of myopia or hyperopia. [0005] Invention content: [0006] The object of the present invention is to addres...

AI Technical Summary

Problems solved by technology

Although there are international standard visual acuity charts, logarithmic visual acuity charts, and Langer's circular visual acuity charts, they are generally black on a white background and only have the function of detecting myopia or hyperopia.

Images