Is myopia hereditary? Many patients with myopia consider whether myopia is hereditary when they plan to have children, so after they decide to have children, they go to the hospital and ask if myopia is hereditary, fearing that they will pass their myopia on to their children. Myopia can be hereditary: From the analysis of eye disease findings, the rate of myopia in family members with a family history of myopia is higher than those without a family history of myopia, indicating that the onset of myopia is somewhat related to heredity. However, the occurrence of myopia is influenced by acquired environmental factors. Therefore, scholars now agree that myopia is polygenic, i.e., the patient has multiple causative genes, but with the role of environmental factors, a phenomenon easily seen in the occurrence of simple myopia. Environmental factors include poor lighting, poor reading and work habits, such as prolonged reading and close work, where the eye’s regulating muscles are in a constant state of tension and contraction, which in turn weakens the ability to regulate and myopia occurs. However, the same conditions do not occur in all people with myopia, and some myopic patients do not do close work, and some even rarely read books and newspapers. It is clear that myopia is the result of a combination of genetics and environment. High myopia is an autosomal recessive disease, meaning that the pair of genes involved in myopia are both causative of the disease before it develops. If only one of the genes is pathogenic and the other gene is normal, the disease does not develop and the person is a carrier of the pathogenic gene. For example, if both parents are not myopic, but they are both carriers of the high myopia gene, they do not show myopia themselves, but both of their pathogenic genes are passed on to the child, so the child has two myopia genes, and therefore the child will become myopic. If a man with high myopia (600 degrees or more) combines with a woman with high myopia, the chance of having a child with myopia is more than 90%, and if he combines with a carrier of the myopia gene, half of his children may be highly myopic, while the chance of having a child with normal vision or low to moderate myopia is 1%.