Due to differences in ethnicity and cultural background, the prevalence of myopia in China is among the highest in the world. The earliest statistics on the prevalence of myopia in China began in 1955, mainly from student censuses, and from 1955 to 1965, the prevalence of myopia in China increased slowly, but from 1966 to 1976, during the Cultural Revolution, the prevalence of myopia decreased significantly, and in the 30 years after 1976, the The incidence of myopia in China has increased threefold. This indicates that in addition to genetic factors, the environment also plays an important role, and the development of myopia has an important relationship with learning behavior and prolonged close reading, and students who read for longer periods of time have a higher detection rate of myopia and a higher degree of myopia, and prolonged reading prevents printed materials from stimulating photoreceptors other than the retinal macula, which may be the cause of myopia. Epidemiological surveys have found that urban students are more prone to myopia than rural students. Based on the same yellow ethnicity, a scholar once surveyed a population of adolescents in mountainous areas of Nepal and found that the prevalence of myopia was only 3%, which fully indicates that rural students have more space to move around, a wider field of vision, and more outdoor activities, which are conducive to eye relaxation and rest.