Myopia generally belongs to mild myopia within 300 degrees, moderate myopia between 300 and 600 degrees, and high myopia above 600 degrees. Mild to moderate myopia is generally not particularly harmful to the fundus, high myopia, especially 600 degrees, 800 degrees, 1000 degrees or more of the fundus of the opportunity to gradually grow, so from the degree of 300 degrees is not serious. But also according to the age, if a child 15 years old 300 degrees, think that by 18 years old may progress after the degree will not be very high. But if an eight-year-old child is now 300 degrees, his future growth will be very obvious, then 300 degrees is a very serious degree, so we also need to take into account the age and degree of comprehensive consideration. Now there is a tendency for myopia to be younger, so the state requires that myopia prevention and control be carried out from secondary school to elementary school and now to kindergarten. The recommended methods to control myopia are keratoplasty, low-concentration atropine, refractive devices, defocused soft lenses, defocused frame glasses, etc. Parents can choose one or more of these methods according to their child’s age, prescription, degree of adaptation, and family conditions.