- Fluorescein angiography: This test is done to check for abnormalities of eye blood vessels. A yellow dye is injected into an arm vein and travels to the blood vessels in the eyes. Pictures of the retina are taken with a special camera that flashes a blue light into the eye. The pictures show if any dye has leaked from the vessels into the retina, indicating possible abnormalities. This test is done at enrollment and after 1 year, unless additional tests are needed for medical management.