What are the types of corneal lenses?
(a) A large lens of 10-12 mm in diameter, termed a corneal lens. (b) A small lens of less than 9.5 mm termed a microcorneal lens. This is the most common type of lens fitted to-day. What are they made of? These are made of a special quality of polymethmethacrylate, a special plastic which has a good resistance to scratches, low tendency to warp and can be polished to a high brilliance. Contact lenses are very thin (almost one 200th of an inch in thickness) and must be handled with care. How do I know if hard contact lenses will suit me? The answer is usually given by a trial wear of lenses at the doctor’s clinic. Quite often the doctor can tell after examination whether hard lenses will suit you or recommend an alternative if they do not. Can a contact lens slip behind the eye? No. The space between the lids and the eye is a securely closed space. If the lenses are displaced from the cornea to the white of the eye, they can be easily recentred by methods taught to you by the doctor. So
