The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Together with the lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is approximately 43 dioptres.
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cornea The transparent front part of the eye that covers the iris, pupil, and anterior chamber. (source: Wikipedia)