Find out about this condition that can cause visual impairment. Includes advice about cause, signs and symptoms, and treatment.

Personal account of having the disease as well as articles and links for further research.

Good resource with an intro to the disease as well as links and resources. Features support group mailing list.

From the Indiana University with info on causes, symptoms, and management of the disease. Includes reference list.

Organization with the intention of improving the lives of the people afflicted with this disease. Includes info on support groups and research.