How do ortho k lenses work?
For people who are short-sighted, the cornea is like a camera lens that is too curved (convex) in shape. This means that it does not focus light correctly. Changing the shape of the lens by making it less curved makes it focus light properly, thus giving the eye clear vision.
Ortho k lenses are manufactured with ‘breathable’ plastic materials that allow a good amount of oxygen to pass through them and keep the cornea healthy. They are also designed to give great vision whilst they are being worn – if you wake up during the middle of the night, you should be able to see perfectly.