Why are tears important to the cornea?
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Every time we blink, tears are distributed across the cornea to keep the eye moist, help wounds heal, and protect against infection. Tears form in three layers:
- An outer, oily (lipid) layer that keeps tears from evaporating too quickly and helps tears remain on the eye;
- A middle (aqueous) layer that nourishes the cornea and the conjunctiva – the mucous membrane that covers the front of the eye and the inside of the eyelids;
- A bottom (mucin) layer that helps spread the aqueous layer across the eye to ensure that the eye remains wet.
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