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Corneal Modifications for Vision Correction
How the cornea works
The cornea is the clear covering of the front of the eye which bends (or
refracts) light rays as they enter the eye. For clear vision to occur, the
cornea must have the proper shape and power to focus incoming light rays precisely
on the retina at the back of the eye. If the cornea is too steep, too flat
or irregular in shape, it cannot bend light at the angle needed to focus on
the retina. As a result, eyeglasses or contact lenses may be needed to refract
the incoming light rays at the angle needed for clear vision.
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