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A form of color blindness exhibiting loss of the blue receptor, inherited in an autosomal recessive fashion.

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).

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.