A vision chart for multifunctional detection

Abstract

The invention discloses a multifunctional detection visual acuity chart which comprises a rectangular plate body, wherein plugging slots are formed in the rectangular plate body; a black plugboard and a red plugboard are respectively plugged into the plugging slots; the front end surface of the rectangular plate body is coated with a green coating layer; a plurality of circular grooves are formed in the green coating layer; circular turntables are connected into the circular grooves in a plugging manner; E-shaped grooves are formed in the circular turntables; the E-shaped grooves are communicated with the adjacent plugging slots in the rectangular plate body; four positioning slots are formed in the upper, lower, left and right side walls of each circular turntable; the connecting line of two positioning slots at opposite positions is a horizontal line or a vertical line; four positioning ball-head plungers corresponding to the positioning slots are screwed into the inner side walls of the circular grooves; ball heads of the positioning ball-head plungers are embedded into the corresponding positioning slots; arc-shaped shifting handles are formed on the circumferential edges of the surfaces of the circular turntables; the shifting handles are positioned between the adjacent positioning slots. The multifunctional detection visual acuity chart can simultaneously detect red-green color-blindness, and the direction of E can be changed to prevent cheating.

Description

Technical field: [0001] The invention relates to the technical field of medical vision testing equipment, in particular to a multifunctional testing vision chart. Background technique: [0002] 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 the existing eye charts have a variety of such as international standard eye charts, logarithmic eye charts, and Lange ring eye charts, etc., these eye charts are generally black on a white background, and only have the detection function of myopia or hyperopia. In addition, The direction and position of the word E on these eye charts are fixed, and some people with cheating mentality will memorize the ent...

AI Technical Summary

Problems solved by technology

Although the existing eye charts have a variety of such as international standard eye charts, logarithmic eye charts, and Lange ring eye charts, etc., these eye charts are generally black on a white background, and only have the detection function of myopia or hyperopia. In addition, The direction and position of the word E on these eye charts are fixed, and some people with cheating mentality will memorize the entire eye chart in order to improve the test results, resulting in errors in the test results

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