Orthokeratology is a new type of glasses to prevent and treat myopia in teenagers. It is a specially designed rigid orthokeratology lens with physical shaping method and reasonable programming. Wear it on the eye surface at night and then let the cornea deform according to the reasonable shape we set. By changing the shape of cornea, some myopia and astigmatism problems in teenagers can be corrected particularly effectively, so the purpose of wearing glasses at night is to make myopia cornea become mild myopia or non-myopia cornea. During the day, the myopia of teenagers is reduced or disappeared due to the change of corneal shape. If they use it for a long time, myopia can be controlled to a certain extent, and it can also prevent and treat myopia.