1. Generally, myopia within 300 degrees is called mild myopia, moderate myopia between 300 and 600 degrees, and high myopia above 600 degrees.
2. General 1.0 or 5.0 vision is regarded as normal vision. Those above these two standards are good eyesight, and those below 4.8 are myopia.
The main causes and pathogenesis of myopia;
(1) About 85% of myopia is related to myopia (such as reading books, watching TV and watching computers, that is, myopia can be prevented;
(2) About 1.5% myopia is related to the increase of axial length, which is controlled by congenital variation or heredity, and the treatment effect is poor. It can be seen that juvenile myopia is a preventable and incurable eye disease.
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