Experts say, from the clinic is not difficult to find, both parents are highly myopic, gave birth to a child myopia chances are greater than only one parent is highly myopic situation; parents have a high degree of myopia, the child myopia chances than the parents have no high degree of myopia chances of high, therefore, from the eugenics point of view, ophthalmology experts do not recommend that men and women with high degree of nearsightedness get married and have a child. According to statistics, China’s 1.3 billion people, the incidence of myopia is as high as 25%. Among them, the majority of adolescents are myopic, about 70-80% of students attending secondary schools are myopic. Whether or not it can be prevented, it is necessary to understand the causes of myopia and other influencing factors. It is generally believed that the causes of myopia are summarized in two major factors: genetic and environmental. Genetic factors play an important role in the occurrence and development of myopia. Some people have done a lot of family statistics, also known as family survey, where both parents have myopia, their children have myopia percentage is significantly higher than other families. In addition, both parents are highly myopic (more than 600 degrees), the children are almost always highly myopic. Myopia is related to ethnicity, with high rates of myopia in Asian, Singaporean, Japanese, and Chinese ethnic groups, which are genetically linked. In Singapore, which is made up of Malays and Chinese, the myopia rate of Chinese is much higher than that of Malays under the same living environment. Our experts have investigated the prevalence of myopia in twins, thinking that twins suffer from myopia at the same time or not at the same time, i.e., the concordance rate, and the result shows that the concordance rate of myopia in twins is higher than that in non-twins, which also indicates that myopia is a hereditary disease. It has also been found that families with two parents who are highly myopic have a high incidence of high myopia in the next generation, but the genetic predisposition is less pronounced for low levels of myopia in general. To summarize the causes and influencing factors of myopia, we believe that high myopia, heredity plays a considerable role, but the vast majority of adolescents with simple myopia, the influence of acquired environmental factors is greater, to understand these influencing factors, from all aspects of the elimination of these unfavorable factors, myopia can be prevented and treated.