A child with 400 degrees of myopia is still relatively serious. Because the development of myopia can be basically stopped only when they are about 18 years old, if myopia appears too early, the possibility of high myopia in the future is very high. For 400 degrees of myopia, first of all, it is recommended to take the child to a regular hospital for an optometric examination and to improve vision through various correction methods. There are two main correction methods available for children: the first is frame glasses, which is the most used and most convenient method; the second is corneal contact lenses, of which there is a corneal contact lens that can be applied to the correction of myopia in children, which is a keratoplasty lens, which can effectively slow down the development of myopia.