Participants will have a medical history, physical examination and complete eye examination. The latter will include a vision test, eye pressure measurement, examination of the pupils, lens, retina, and eye movements. Photographs of the eye will be taken with a special camera. Patients will also undergo fluorescein angiography, a test that takes pictures of the retina using a yellow dye called sodium fluorescein. The dye is injected into the blood stream through a vein. After it reaches the blood vessels of the eye, photographs are taken of the retina.