Diameter The normal average diameter of the adult cornea is 115 mm

(10-13 mm). A congenitally small cornea (microcornea, diameter less than

10.0 mm) or a congenitally large cornea (megalocornea, diameter from 13 to

15 mm) is always an abnormal finding (see Corneal Size Anomalies).

Nourishment: The five layers of the cornea have few cells and are unstructured and avascular. Like the lens, sclera, and vitreous body, the cornea is a bradytrophic tissue structure. Its metabolism is slow, which means that healing is slow. The cornea is nourished with nutritive metabolites (amino acids and glucose) from three sources:

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