Definition: The transparent, dome-shaped tissue covering the iris and the pupil. The cornea shields the eye from germs, dust, and other harmful matter. It also acts as the eye's outer lens. Much like a window, the cornea controls light entering the eye. It also contributes to the eye's focusing ability.
Cornea
By Troy Bedinghaus, O.D., About.com Guide
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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