Scleral contact lenses are large-diameter contact lenses that do not make contact with the entire surface of the eye but instead vault over the majority of it, only touching down on the sclera, which is the white part of the eye. The gap that is beneath plays an important role in the suitability of these lenses for those patients who can’t wear regular varieties.
Ortho-K, or orthokeratology, is an innovative new way of helping patients with refractive eye errors such as myopia (nearsightedness) see without using prescription contacts or glasses. It works using specially-designed, gas-permeable contact lenses that are worn overnight to reshape the cornea while you sleep. You simply pop them in before you go to bed and, while you are in the land of nod, they will work along with the tear film that flows beneath them, to make your cornea a more regular shape. The next morning, you can take them out and you will see a significant improvement in your vision.