The causes of myopia include genetic factors and environmental factors such as close eye use. 1. Genetic factors: highly myopic parents are closely related to the occurrence of myopia in adolescents. 2. Environmental factors (1) Close work: Close work is a risk factor for the development of myopia, which should be avoided as much as possible. (2) Bad reading and writing habits: including close reading and tilting the head when writing can lead to myopia. (3) Other factors: prolonged use of cell phones, computers and other electronic products, too little outdoor activity, poor environmental lighting and other factors are also closely related to the development of myopia. Related factors should be avoided in daily life. If there is any discomfort, it is recommended to consult a doctor in time.