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The cornea allows light to enter the eye for vision. Here are the basics you should know about this important part of the eye. Cornea Definition The cornea is the clear front surface of the eye. It lies directly in front of the iris and pupil, and it allows light to enter the eye. Cross-section of cornea. Viewed from the front of the eye, the cornea appears slightly wider than it is tall. This is because the sclera (the “white” of the eye) slightly overlaps the top and bottom of the anterior cornea. The horizontal diameter of the cornea typically measures about 12 millimeters (mm), and the vertical diameter is 11 mm, when viewed from the front. But if viewed from behind, the cornea appears circular, with a uniform diameter of approximately 11.7 mm. This makes the cornea about two-thirds the size of a dime. The center thickness of the average cornea is about 550 microns, or slightly more than half a millimeter. The cornea has five layers. From front to back, these layer

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