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A unit of power of a lens, the reciprocal of the focal length of the lens.

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.

Reflex that enables the eyes to focus on a single point in near vision.