Harmful 1, developmental Before 7 years old (preschool) children myopia is usually lifelong developmental, the younger the age, the higher the myopia in the future. If children’s myopia is not well controlled, more than 95% of them will develop into high myopia of more than 600-1000 degrees in adults.2. Blindness The higher the degree of myopia in children, the higher the chances of blindness caused by concurrent fundus hemorrhage and retinal detachment. When children’s myopia develops into high myopia, about 1/4 of them can suffer from low vision or even blindness due to the complication of fundus macular hemorrhage or retinal detachment, etc. 3.Difficult to cure Children’s myopia is difficult to be controlled by the traditional myopia treatment methods. Because: (1) children’s growth and development is in the peak period, so that children’s eyes can easily become longer. (2) Due to the poor compliance, and the opportunity to “look at the near”, children look at the near distance and duration of time is particularly difficult to control. (3) The traditional myopia treatment device can neither shift the focus away from the nearsightedness to offset the main cause of myopia “looking close”, nor can it block the two key links of myopia by offsetting the near reflexes and increasing the sensitivity of focusing, therefore, the effect is not good. 4. It can cause intractable amblyopia, which can be aggravated by the deprivation of visual sense due to the low visual acuity. In turn, it can cause aggravation of myopia. Children’s myopia and high myopia have a high incidence of concurrent amblyopia. The effect of myopic amblyopia in children using ordinary amblyopia devices is poor, while the use of high-precision amblyopia devices can improve the therapeutic effect, but due to the fact that amblyopia device treatment is a kind of ultra-near work, there is a risk of aggravating myopia. Second, the main points of treatment: (1) Wear appropriate glasses, such as keratoplasty lenses and progressive focusing off-focus lenses to slow down the increase of myopia (2) Treat amblyopia as early as possible, because amblyopia can cause morphologic deprivation myopia, which can aggravate myopia. (iii) If you have astigmatism, it should be corrected to the fullest extent, such as astigmatism of 400 degrees or more. Because astigmatism undercorrection and miscorrection, can increase the focusing burden of the eye, and cause and aggravate myopia. Avoid strenuous exercise: If children are highly myopic, they should avoid strenuous exercise such as high jumping, diving, playing blue ball, etc. to prevent fundus hemorrhage and detachment of the net. Annual fundus photography: children with high myopia must have their fundus photographed annually and have their eye axes ultrasonically examined. Understand the corresponding changes, there are no complications, in order to take targeted treatment.