The lens of an eye is normally clear. If the lens becomes cloudy (opacified) it is called a cataract.
Update Date 8/11/2015
Updated by: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.