glossary

Opacification of the crystalline lens. An extraction of the lens is usually replaced by an intra-ocular lens (implant). Clouding of the crystalline lens, which may prevent a clear image from forming on the retina. If visual loss becomes significant, surgical removal is required. Types of cataracts include traumatic, congenital and age-related. .

These are visual field defects that extend from the central vision to the natural blind spot. This type of field defect usually represents an insult to the cluster of retinal ganglion cells called the papillomacular bundle.

An eye’s best vision; used for reading and discriminating fine detail and color.