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Cornea
The cornea is the crystal clear dome-shaped front part of the eye through which the colored
iris and black pupil are seen. It is about one-half inch in diameter, the size of a dime.
The cornea is the most important optical element in the eye. It is curved to help focus rays
of light on the retina. It provides more than 2/3 of the total focusing power of the eye. To
focus well, the cornea must have a smooth, clear surface. The eyelids and tears act as
windshield wipers, lubricating and cleaning debris with each blink. The cornea must be kept
moist. If anything happens to interfere with tear production, blinking or complete closure
of the lid, the cornea may suffer.
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