This is the more serious form of macular degeneration associated with acute swelling in the retina. Macular degeneration can be thought of as a premature aging of the macula, the part of the retina responsible for good central vision. Most people have dry macular degeneration, which is a slow and progressive loss of vision. A certain percentage of these people develop “wet” degeneration where abnormal blood vessels under the retina begin to bleed suddenly. This bleeding causes sudden and severe vision loss as the retina swells with macular edema. Fortunately, the treatment for wet degeneration has improved with the development of anti-VEGF injections such as Avastin and Lucentis.