It can also be complete, in which case there is no perception of light.
Blindness has many causes, yet the incidence of true blindness in the United States remains low.
Accidents, diabetes , and macular degeneration account for most blindness in the United States. Worldwide, vitamin A deficiency is the leading cause of blindness. The information provided herein should not be used for diagnosis or treatment of any medical condition. It is provided for your general information and is not a substitute for medical care or supervised medical treatment. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions.