The causes of myopia include genetic factors and poor eye habits. Genetic factors are one of the most important causes of myopia, but myopia is not a single-gene disease, and it is not possible to accurately predict the probability of myopia in the offspring based on family history. If there are several myopes in the family, especially those with high myopia, i.e., myopes with more than 600 myopia, the likelihood of myopia in the offspring is higher than that of the general population. Unhealthy eye habits are one of the controllable factors in the development of myopia, which usually refers to prolonged close-distance use of the eyes, use of the eyes in dim or shaky environments, flickering light, etc. This can cause significant visual fatigue. This can cause significant visual fatigue, which can lead to an increase in myopia. In addition, trauma to the eye resulting in subluxation of the lens, etc. may also cause myopia.