Diseases of the external eye and cornea include a wide range of conditions affecting the eyelids, sclera, and ocular surface (cornea, conjunctiva, and limbus). The external eye has both anatomical and immunologic defense mechanisms that protect the eye against infection and other ocular conditions.
Current corneal disease classifications and evolving corneal grafting techniques make knowledge of corneal anatomy of the utmost clinical and surgical importance.
The total dioptric power of a normal human eye is 58.60 diopters (D), to which the cornea contributes 74%.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.