glossary

A network of drainage channels located at the periphery of the anterior chamber of the eye, through which aqueous drains from the eye into the circulation.

A surgical procedure to allow aqueous to flow from the anterior chamber of the eye to a space under the conjunctiva in a controlled fashion, in order to reduce the pressure in the eye.

An ophthalmic lens that incorporates three lenses of different powers. The main portion is usually focused for distance (20 ft.), the center segment for about 2 ft., and the lower segment for near (40 cm, or 16 inches).