The cornea is the transparent front part of the eye
that covers the iris, pupil, and anterior chamber. The cornea, with the
anterior chamber and lens, refracts light, with the cornea accounting for
approximately two-thirds of the eye's total optical power. In humans, the
refractive power of the cornea is approximately 43 dioptres. The cornea can be
reshaped by surgical procedures such as LASIK.
While the cornea contributes most of the eye's
focusing power, its focus is fixed. Accommodation (the refocusing of light to
better view near objects) is accomplished by changing the geometry of the lens.
Medical terms related to the cornea often start with the prefix
"kerat-" from the Greek word κέρας, horn.
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