Electronic visual chart for vision examination

Abstract

The invention belongs to the technical field of vision examination, and an electronic visual chart for vision examination. A placement groove is formed in the right portion of the lower side of the front end of a hanging plate, side grooves are formed in the upper end and the lower end of the inner wall of the placement groove, at least three springs are horizontally and evenly embedded and fixedto the groove bottom of each side groove, a clamping strip is elastically connected into each side groove through the corresponding spring, and a grip clamped with the corresponding clamping strip isarranged in each placement groove. When the eyesight needs to be tested through physical examination; a pull rope is pulled by holding the grip; the length of the pull rope released from a rope wheelis five meters; half of the length is 2.5 m; vision detection work can be carried out according to different distances; when the electronic visual chart is lengthened by five meters for eyesight testing, a user does not need to estimate the distance from the electronic visual chart to the hanging plate, so that the eyesight testing accuracy is improved, and the problems of inaccurate testing easily caused by difficult distance control, excessive waste of electric energy caused by long-time lighting of the electronic visual chart and the like in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of visual acuity examination, in particular to an electronic eye chart for visual acuity examination. Background technique [0002] Vision examination refers to a comprehensive examination of the subject's eyes through medical means and methods, including vision, eye position, fundus, conjunctiva, intraocular pressure, etc., which can effectively prevent and control eye diseases and protect eye health. When the visual acuity examination is performed to test vision, the examinee is required to conduct a physical examination against the electronic vision chart. [0003] The current electronic eye chart for visual acuity examination needs to be tested with one eye and one eye during the strength physical examination, which makes it necessary to cover the object and need a certain distance from the electronic eye chart. If the distance is difficult to grasp, the test is prone to inaccuracy Phenomenon, and today...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide an electronic eye chart for visual acuity examination to solve the problem that the distance is difficult to grasp in the prior art and the phenomenon of inaccurate testing is easy to occur and the electronic eye chart is too wasteful of electric energy if the light is turned on for a long time And other issues

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