/ˌôrTHōˌkerəˈtäləjē/ (also called Ortho-k, Overnight Vision Correction, Corneal Molding, and Corneal Refractive Therapy)
the reshaping of the cornea to improve eyesight with custom made rigid contact lenses worn while sleeping, in order to correct near-sightedness (myopia), far-sightedness (hyperopia) and astigmatism. These special lenses are removed upon waking, the result is clear vision all day long.
Custom designed contacts
Wear while you sleep
Take them out in the morning...