Eyesight detection method and device and eyesight detector

Abstract

The application provides an eyesight detection method and device and an eyesight detector. The method comprises the following steps: controlling a light source to output an optical signal, and enabling light output by the light source to be aligned with an eyeball of a to-be-tested user; acquiring an image of the tested user and capturing an eye image of the to-be-testedtested user from the acquired image; identifying the eye image, judging whether the eye image comprises an image with a light source, if yes, adjusting the distance between an eye of the tested user and the light source along an output path of the light source, otherwise, acquiring the distance between the light source and the eye of the user; taking the distance between the light source and the eyeball of the user as a focal length value of a crystalline lens of the tested user; calculating an eyesight value of the tested user according to the focal length value. In the testing process, the user is in a tested state, and the user does not need to read information actively, therefore, the crystalline lens of the user keeps a normal state all the time in the testing process and does not deform, and an eyesight measurement result is more accurate.

Description

technical field [0001] The invention relates to the technical field of vision detection, in particular to a vision detection method, device and vision detector. Background technique [0002] The human eye sees external things clearly based on the principle of convex lens imaging. The image of the scene formed by the lens of the eyeball with normal vision just falls on the retina, so that people can see the scene clearly, while myopia and hyperopia cause the focal length to change due to the thickening or thinning of the lens of the eyeball. Small or large, so that the formed scene image falls in front of or behind the retina, making it impossible to see. Therefore, the focal length of the eyeball lens of people with different vision sizes is also different. [0003] In the prior art, when visual acuity is tested, the test is usually carried out by watching the eye chart. However, during the test, when a certain character on the eye chart cannot be seen clearly, the person un...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, when visual acuity is tested, the test is usually carried out by watching the eye chart. However, during the test, when a certain character on the eye chart cannot be seen clearly, the person under test will Characters, the eyes will squint unconsciously, causing the shape of the lens to change, resulting in an error between the real vision and the measured vision

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