Remote control adjustable visual acuity chart

Abstract

The invention provides a remote control adjustable visual acuity chart, and belongs to the technical field of visual acuity charts. The remote control adjustable visual acuity chart comprises a box body formed by connecting an outer shell and a panel. A bottom plate and a guide plate are arranged in the box body in parallel. Vision mark rotating systems are arranged between the bottom plate and the guide plate in a matched mode. A control circuit board used for controlling the vision mark rotating system is fixedly arranged on the guide plate. Each vision mark rotating system comprises a motor fixedly arranged on the bottom plate, a rotating sleeve connected with the motor in a transmission mode, a lampshade fixed to the rotating sleeve, and a vision mark fixed to one end of the lampshade. Lamp holders are arranged in the lampshades in a matched mode. A set of LED bulbs are fixedly arranged on each lamp holder. The remote control adjustable visual acuity chart has the advantages that the vision marks are reduced; the influences on view angles are reduced, and the testing accuracy is improved; due to the remote control, no indication sticks are needed, and the influences of the indication sticks do not exist; meanwhile, due to the fact that only one grade of illumination is used in each time of remote control, the view marks randomly rotate, and the possibility that tested people improve the tested vision by remembering the visual acuity chart is eliminated.

Description

technical field [0001] The invention belongs to the technical field of eye charts, and in particular relates to a remote control adjustable eye chart. Background technique [0002] At present, general hospitals and schools test eyesight with common eye charts. There are many disadvantages in them, the main ones are: 1. The visual target is fixed, and the visual acuity of the tested person can be improved by at least 2 to 5 levels as long as he tries to pass the shorthand. 2. The height of the distance vision chart with a national standard detection distance of 5 meters is 777 cm, and the vertical span is large, which affects the viewing angle, which will definitely affect the accuracy of the test. 3. There are too many optotypes, especially those with better eyesight. The nearby optotypes have a greater impact on the readers' optotypes, and can be compared in a short time. 4. The indicator stick also has a great influence on the detection. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

They have many disadvantages, mainly as follows: 1. The visual standard is fixed. As long as the testee is willing to pass the shorthand, the vision can be improved by at least 2 to 5 grades.

2. The distance vision chart with a national standard detection distance of 5 meters has a height of 777 cm, and the vertical span is large, which affects the viewing angle, which will definitely affect the accuracy of the test.

4. The indicator stick also has a great influence on the detection

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