The precise structure and normal function of each of the 5 layers of the cornea are essential for maintaining its transparency. Disruption of any of these layers may result in vision loss due to lack of corneal clarity.
Infectious keratitis can be due to a variety of organisms and may result in significant scarring, ulceration, and even perforation of the cornea.
Degeneration of corneal structures and stromal ectasias may be primary or may be secondary to other ocular conditions.
Corneal dystrophies are bilateral, typically progressive, inherited conditions that often interfere with visual function.
Excerpted from BCSC 2020-2021 series: Section 4 - Ophthalmic Pathology and Intraocular Tumors. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.