Well, orthokeratology can really control the growth of myopia. A child is so young that he is 400 degrees nearsighted. You must have a detailed medical optometry and a pair of suitable glasses first. If you are in Luoyang, go to Luoyang Pok Oi Eye Hospital, a professional eye hospital, which specializes in glasses, and the price is not more expensive than outside. Mainly a kind of peace of mind ~