Orthokeratology is the technique of reshaping the cornea temporarily to correct refractive errors such as myopia, hyperopia and astigmatism through the use of a specially designed, gas permeable contact lens. Such lens are worn in the eye overnight for it to gently reshape the cornea for clearer vision the next day. Orthokeratology is ideal for individuals who wish to have clear vision without glasses or contact lenses. It is also recommended as a form of myopia control lenses for children.