Orthokeratology is a kind of rigid contact lens which have reverse geometric desi, with higher oxygen permeability and security. Overnight wearing of orthokeratology can decrease the central corneal curvature and increase peripheral corneal curvature by flatting the central department of corneal, thus reduce the refraction of myopia. Through a period of time of wearing orthokeratology lens, patients can obtain good eyesight without frame glasses. Insisting on wearing orthokeratology lens can control the development of myopia. Orthokeratology is widely applied in the control of juvenile myopia, so we need scientific evaluation system to measure the visual quality after wearing orthokeratology lens. Here are the methods that used to evaluate the visual quality after wearing orthokeratology lens.