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. .
Sightless area within the visual field of a normal eye, where the optic disc attaches the optic nerve to the eye. Caused by absence of light sensitive photoreceptors where the optic nerve enters the eye.
A group of genetically engineered antibodies which target specific molecules involved in the immune system or the system which regulates inflammation and block their action. Anti-VEGF drugs belong to this group.