Genetic factors play an important role in the occurrence and development of myopia. If one spouse is myopic, the chances of having a child with myopia are about 50%; if both spouses are myopic, the chances of having a child with myopia are upwards of 85%. From the perspective of eugenics, ophthalmologists do not recommend that men and women with high myopia marry and have children. According to statistics, more than half of the world’s 7 billion people have visual impairment. Among the 1.3 billion people in China, the incidence of myopia is as high as 25%. Among them, myopia is predominant among teenagers, with about 70-80% of students attending secondary schools being myopic. Therefore, myopia has been called the “national disease”, which seriously affects the quality of our population and national security. How to effectively prevent and control the occurrence and development of myopia. Experts say that there are two causes of myopia: genetics and environment. When genetics is unavoidable, how can we prevent myopia? 1, research shows that outdoor sports are good for preventing the occurrence of myopia. Parents should spend more time with their children playing sports outdoors in the sun, at least 2 hours a day is recommended. 2. Reduce the amount of time spent using eyes at close range. Take a 5-minute break for every 45 minutes of work and study; keep the distance between reading and writing at 33cm-44cm, and do not lie down to read and play games. 3, to ensure adequate rest time. Sleep 8-10 hours a day. 4, pay attention to eye protection. Avoid the occurrence of violent collisions, lighting environment to be comfortable; balanced nutrition, control the intake of sweets, etc. 5, regular comprehensive vision and eye health checkups; understand the eye condition so that timely measures can be taken. 6.Once myopia occurs, it is recommended to go to a professional eye hospital for correction. Wearing undercorrected or overcorrected glasses, myopia will grow faster.