The cornea is a transparent structure that covers the iris. Certain metabolic diseases, trauma, infectious diseases, nutritional deficiencies and environmental situations may cause the cornea to be less transparent and cloudy. If the cornea becomes cloudy, it can lead to various degrees of vision loss.
Review Date 8/18/2020
Updated by: Franklin W. Lusby, MD, ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.