First, let’s understand what myopia is all about. Our eyes are called ortho-optic if they are not nearsighted or farsighted or astigmatic, and they look exceptionally well. External light rays can be focused on the retina. If the external parallel light cannot be focused on the retina, but in front of the retina, you need to move the object closer or use a concave lens to disperse the light to focus on the retina, that is myopia. It is clear when you look close, but not when you look far. There are three causes of myopia: 1. the anterior and posterior diameters of the eye are too long, 2. the corneal refractive power of the fixed-focus lens of the eye is too strong, and 3. the lens refractive power of the zoom lens of the eye is too strong. Most people have myopia due to the first cause. There are many factors that influence the development of myopia, and the main ones are broadly classified as genetic, environmental and nutritional factors. 1, genetic factors: parents unilateral myopia, the probability of inheritance is about 25%. The probability of inheritance is about 50% if one parent is highly myopic. If both parents are highly myopic, the probability of inheritance is as high as nearly 100%. 2, environmental factors: a large number of close eye use is the main cause of myopia, such as: writing homework, reading newspapers, watching TV, playing with computers and cell phones, etc. In addition, various improper attention to close work, such as the light environment, distance, length of time, eye habits posture, etc., will also induce the development of myopia. 3, nutritional factors: poor dietary structure and eating habits are also one of the causes of myopia. For example, many children nowadays are partial eaters, eat too sweet, unbalanced intake of micronutrients, etc., which can lead to a decrease in the eyes’ ability to resist myopia. So eating more green vegetables, fruits, and supplementing with lutein can help prevent myopia. The child has good academic performance, but also pay more attention to good eye habits, but all the way to the heavy school work, he also has a very important genetic factors, is his mother my friend was also highly myopic, just a few years ago to do surgery to remove the heavy glasses. Readers, pay attention to the protection of good eyes, oh, read this article to take a break, the phone screen long look hurt eyes.