1, the causes of myopia in young children: (1) congenital inheritance: the father or mother has a high number of myopia, very easy to inherit to the child. (2) congenital mutations, parents do not have serious myopia, but the child has myopia. (3) Astigmatism: Astigmatism is always clear in one direction and hazy in the other, and always requires partial adjustment, or squinting or head-shifting, which can cause and aggravate myopia. 2, the severity of myopia in young children: (1) lifelong development: there are two factors that cause the development of myopia: A, the eye grows larger and longer with age, each 1mm long, which is equivalent to an increase of about 300 degrees of myopia. B, the strong adjustment of young children, long time close reading, watching TV, playing video games, etc., can cause irreversible convexity of the lens in the eye, making myopia deepen. (2) Blindness: The incidence of myopia in young children is not high, only 3-5%, but once it happens, more than 95% will become highly myopic. The early stage can cause amblyopia, and later on most of them show lifelong development, and by the time they go to high school, most of them can reach more than 800 degrees, and if not treated, many cases can be followed by fundus hemorrhage and retinal detachment leading to blindness. 3, myopia prevention: congenital or hereditary myopia is difficult to prevent, astigmatism and amblyopia caused by the acquired myopia can be reduced by wearing astigmatism and cure amblyopia as early as possible to reduce the occurrence and development of myopia. 4.Prevent myopia development: It is impossible to prevent myopia development in children, because children’s eyes will grow bigger with age, and each millimeter of the eye axis is equal to an increase of 300 degrees of myopia. Wearing glasses can partially prevent the development of myopia because it allows children to see the blackboard and TV more clearly without squinting or over-adjusting, which prevents myopia from worsening. However, when myopia is below 300 degrees, you only need to wear them when you look at the blackboard or watch TV, but you need to wear them often when they are above 300 degrees. 5, myopia treatment for young children: so far, myopia experts at home and abroad generally believe that wearing myopia glasses and paying attention to eye hygiene is still the best way to treat myopia in young children, which can slow down the development of myopia. Regularly replacing glasses, when the child grows to 18 years old, the eye no longer becomes larger, myopia no longer develops, can be cured by laser surgery myopia and remove the glasses. However, it should be noted that the foreseeability of laser surgery after 30 years is not clear. Myopia cannot be cured by non-operative methods: Because myopia can deepen as the eye grows longer with age, myopia cannot be cured unless the eye is surgically shortened or the cornea of the eye is flattened by laser. Therefore, all newspaper, radio and television advertisements that can cure myopia with non-surgical methods should not be taken lightly.