Orthokeratology is a kind of hard contact lens, which can be used to correct myopia and astigmatism. Different from common soft contact lenses, they are usually worn at night and can maintain normal naked eye vision during the day. Orthokeratology lenses are more expensive than soft contact lenses, generally around 2000- 10000 yuan. According to ametropia, different degrees, different brands of glasses, the price is different.