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
Updated: January 15, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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