Often the first sign of the disorder is an inability to see in low light and darkness (night blindness). Those affected usually develop a ring-shaped blind spot surrounding the center of their visual field. This blind spot then expands to affect both central and peripheral (side) vision. Eventually all vision is lost.
|Primary Medical Reviewer||Adam Husney, MD, MD - Family Medicine|
|Specialist Medical Reviewer||Carol L. Karp, MD - Ophthalmology|
|Last Revised||August 24, 2011|
WebMD Medical Reference from Healthwise