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The ?front window? of the eye. Transparent front part of the globe shaped like a slightly domed cap. It is the primary focusing structure with the lens. Transparent membrane in the front of the eye that covers the iris, pupil, and anterior chamber and provides most of an eye’s optical power.

A pigmented part of the eye, lying just behind the iris. One of its functions is to produce aqueous.

A lens having two separate and distinct points of focus (focal lengths) which incorporate two different powers in each lens, usually for near and distance corrections.