Automatic eyesight testing device

Abstract

The invention discloses an automatic eyesight testing device, which comprises a testing emitter and a testing receiver. The testing emitter comprises a first single-chip microcomputer, a first key, asecond key, a third key, a fourth key and an infrared emission circuit. The testing receiver comprises an infrared receiving circuit, a comparator, a counter, a second single-chip microcomputer, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, a character display screen and a result display screen. The automatic eyesight testing device has advantages that by an infrared wireless signal transmitting technique and a single-chip microcomputer control technique, a person taking eyesight test can complete the eyesight test independently, convenience and quickness in operation and result accuracy are realized, and results can be displayed on a display screen.

Description

technical field [0001] Embodiments of the present invention relate to a vision testing device, in particular, to an automatic vision testing device. Background technique [0002] Visual acuity is generally divided into two categories: distance vision and near vision. The distance vision mostly adopts the international standard eye chart. This table is composed of 12 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 line has a label. [0003] The test method is that the subject's line of sight should be parallel to the line of 1.0, and the distance from the vision chart should be 5 meters. The distance between the vision chart and the subject must be fixed correctly, and the patient should be 5 meters away from the chart. If the indoor distance is less than 5 meters long, a plane mirror should be placed at 2.5 meters to reflect the eye chart. Cover one eye for detection, and identify the directio...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned vision testing method is a traditional manual vision test, which requires special personnel to do special work, but this work has low technical content, wastes labor costs, and also results in inaccurate vision testing.

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