A self-service visual acuity measuring device

Abstract

The invention relates to an eyesight testing device, and in particular relates to a self-service eyesight testing device. The invention aims at providing the self-service eyesight testing device whichcan prevent the ache of the arms and alleviate the labor intensity. The technical scheme is as follows: the self-service eyesight testing device comprises a left support base, a mounting frame, bearing blocks, rotation rods, rollers, a visual chart, a connecting block, an outer ratchet wheel, an inner ratchet wheel, an annular plate, a flexible catch pawl, a swing catch pawl and the like, whereinthe mounting frame is connected to the top of the left support base, the bearing blocks are mounted on the front and rear sides of the upper part in the mounting frame, the bearing blocks are also mounted on the front and rear sides of he lower part in the mounting frame, and the rotation rods are connected between the front and rear bearing blocks. For the device provided by the invention, a swing rod is downwards moved by hands, then the visual chart rotates clockwise, eyesight testing then can be carried out by observing a plane mirror, liftable rods move vertically for enabling eye-shielding plates to move vertically, and therefore, people do not need to cover the eyes by hands for eyesight testing.

Description

technical field [0001] The invention relates to a visual acuity measuring device, in particular to a self-service visual acuity measuring device. Background technique [0002] Because the mobile phone will emit radiation, so people watching the mobile phone for a long time will cause damage to the eyes, which will cause vision loss. In a fixed position, the medical staff point their fingers at the visual acuity test chart to measure people's vision. People tend to have sore arms when using hand-held eye-covering tools for a long time, and at the same time it will increase the labor intensity of the medical staff. In order to reduce the If the labor intensity is lower, the medical staff will reduce the time for measuring people's eyesight, so it is difficult to measure people's eyesight accurately. Contents of the invention [0003] In order to overcome the shortcoming that people use a hand-held eye-covering tool for visual acuity measurement, and people use a hand-held e...

AI Technical Summary

Problems solved by technology

[0002] Because the mobile phone will emit radiation, so people watching the mobile phone for a long time will cause damage to the eyes, which will lead to vision loss. In a fixed position, the medical staff point their fingers at the visual acuity test chart to measure people's vision. People tend to have sore arms when using hand-held eye-covering tools for a long time, and at the same time it will increase the labor intensity of the medical staff. In order to reduce the The labor intensity, the medical staff will reduce the time to measure people's eyesight, so it is difficult to measure people's eyesight accurately

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