An easy-to-use eye chart for ophthalmology

Abstract

The invention discloses a visual chart convenient to use for ophthalmology. The visual chart includes a visual chart body, the reverse side of the visual chart body is fixedly connected with a handle,the bottom of the reverse side of the visual chart body is fixedly connected with an extrusion device, the reverse side of the extrusion device is fixedly connected with a push block, and the left side and the right side of the visual chart body are fixedly connected with a first storage power supply and a second storage power supply respectively. Through cooperation of the visual chart body, thefirst storage power supply and a controller, the left side and the right side of the visual chart body are fixedly connected with the first storage power supply and the second storage power supply respectively, the right side of the first storage power supply is fixedly connected with a light source irradiator, the right side of the light source irradiator is fixedly connected with an irradiationlamp, and thus the light angle can be adjusted. The control over the first storage power supply and the second storage power supply is performed through the controller, and thus a vision board is viewed.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an easy-to-use eye chart for ophthalmology. Background technique [0002] An eye chart is a chart used to measure vision. The eye charts used in China include: international standard eye chart, logarithmic eye chart and Langer's ring eye chart. Functionally, there are near vision chart and distance vision chart. The eye chart is formulated based on the principle of visual angle. Visual acuity is generally divided into two categories: distance vision and near vision. The distance vision mostly adopts the international standard eye chart, which is composed of 14 rows of "E" characters with different sizes and opening directions; the measurement ranges from 0.1-1.5 (or from 4.0 -5.2); Each row has a label, and the subject's visual acuity chart line should be parallel to the line of 1.0, 5 meters away from the visual acuity chart. The visual acuity chart is designed accord...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides an easy-to-use eye chart for ophthalmology, which solves the problem that for people with good memory, memory cheating occurs when testing with the eye chart, which leads to test results unfair question

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