I. Current status of myopia prevalence among adolescents As people’s health requirements continue to improve, good visual status has become an important reflection of people’s improved quality of life. However, myopia, the most common form of poor visual function, is widely prevalent worldwide. In China, myopia is the most prevalent problem, with about 30-40% of elementary school students suffering from myopia, 60% of students in secondary schools having myopic glasses, and the prevalence of myopia among college students being over 80%. The basic pathological change of myopia is the excessive growth of the eye axis, like a balloon over-inflation, which may also cause other complications, such as cataract, glaucoma, retinal detachment, choroidal atrophy, choroidal neovascularization and fundus hemorrhage, which can cause blindness in serious cases. Myopia in adolescents is the number one risk factor for adolescent health and has become a “flooding beast” for the whole society, so the prevention and treatment of myopia in adolescents has become an important health issue for the whole society. The causes of myopia are mainly environmental and genetic factors. In life, we often encounter parents who are myopic and children who wear glasses at a very young age, which indicates that myopia is closely related to genetics. But myopia genetic factors are complex, there are dominant genetic, recessive genetic and multi-gene genetic and so on each possible. Unfortunately, the specific mechanism that causes myopia is still unclear, and it is usually believed that the earlier the onset of myopia, the greater the genetic factor. A large number of surveys have shown that myopia can be triggered by environmental factors such as small living space, close visual distance, and increased working hours at near eye distance. With the continuous progress of social civilization, longer education time, the popularity of television, the popularity of computer network games, the reduction of sleep time, the corresponding outdoor distance activities such as travel, soccer and other activities are greatly reduced. All these environmental factors may be related to the occurrence of myopia.