OrthoK has been around for a long time, from around 1962 in fact which is when the first scientific journal paper on the topic was published. Back then practitioners found they could correct myopia (short-sightedness) by getting patients to wear progressively flatter rigid lenses manufactured in PMMA (Perspex) material. It was well known that wearing rigid lenses caused corneal distortion, … Continue reading What is OrthoK?