A diagnostic test that uses a dye to analyze circulation in the eye. After eye drops that dilate the pupil are administered to the person being tested, pictures of the interior of the eye are taken with a special camera. Next, fluorescein dye is injected into a vein in the arm or hand, and more photographs are taken. The dye, which glows green under special light, outlines the blood vessels of the eye and allows the eye specialist to visualize them and to detect areas of leakage. The fluorescein angiogram is useful for diagnosing a number of eye diseases that affect the back (fundus) of the eye, including diabetic retinopathy, damage from high blood pressure (hypertension), macular degeneration, optic disc edema, and retinitis pigmentosa, and for determining the effectiveness of treatment.