Multi-functional visual chart

Abstract

The invention relates to a multi-functional visual chart. The multi-functional visual chart comprises a table body, a left supporting plate, a right supporting plate, a visual chart frame and a plurality of rotary assemblies, the visual chart frame is perpendicularly arranged between the left supporting plate and the right supporting plate through a second dovetail sliding block, the rotary assemblies comprises a rotary column and two springs, the rotary column is arranged in a through hole in the front and back horizontal directions, a round plate are coaxially arranged and fixedly connectedwith the rotary column, one ends of the two springs are both fixed to the bottom of a second strip-shaped groove, the other ends of the two springs are fixedly connected with a positioning block, andthe positioning block is clamped into the first strip-shaped groove. In conclusion, the multi-functional visual chart is simple in structure, low in cost and convenient to use, and can complete visualacuity measuring work of patients with the low visual acuity.

Description

technical field [0001] The invention belongs to the field of medical equipment, in particular to a multifunctional eye chart. Background technique [0002] When visual acuity is tested in the hospital, the distance between the human eye and the eye chart is 5 meters. When seeing the E letter represented by a line of 0.1 at this distance, it means that the vision is 0.1. On this basis, which line represents the E letter is seen. Indicates the visual acuity, but when the patient's visual acuity is lower than 0.1, all patients with E letters on the visual acuity chart cannot see clearly. At this time, the patient needs to move forward, and the visual acuity is converted according to the distance approached. It is weak and inconvenient to move. In addition, it is not easy to measure the distance the patient moves. In addition, the opening direction of the E letter on the eye chart is fixed. When checking eyesight, someone can write down the opening direction of the E letter in a...

AI Technical Summary

Problems solved by technology

[0002] When visual acuity is tested in the hospital, the distance between the human eye and the eye chart is 5 meters. When seeing the E letter represented by a line of 0.1 at this distance, it means that the vision is 0.1. On this basis, which line represents the E letter is seen. Indicates the visual acuity, but when the patient's visual acuity is lower than 0.1, all patients with E letters on the visual acuity chart cannot see clearly. At this time, the patient needs to move forward, and the visual acuity is converted according to the distance approached. Weak and inconvenient to move, and it is not easy to measure the distance the patient moves. In addition, the opening direction of the E letter on the eye chart is fixed. When checking eyesight, someone can write down the opening direction of the E letter in advance to achieve cheating.

Images