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Surface of the optical part of the eye: damage to the cornea impairs vision. This may be corrected by transplantation.
Thickness 400-700 micrometres, average 560.
The pressure in the eye is measured by depression of the curved surface of the cornea. A thin cornea will produce a misleadingly low indicated pressure, this affects the quick and easy air tonometer more than the Goldman tonometer. The thickness may be measured indirectly, and is relevant to glaucoma monitoring.