Fluorescein Angiography and
Indocyanine Green (ICG) Angiography
Fluorescein angiography (FA) involves the injection of a small amount of vegetable-based dye through a patient’s peripheral vein, usually the arm or hand. The dye is not the same contrast dye used for cat scans (CT), and thus, it is generally safe even for patients with abnormal kidney function. After the dye is injected, an ophthalmic photographer will take a series of time-dependent photographs as the dye circulates through the blood vessels in your retina. The dye lights up areas of abnormal and leaky blood vessels. Not only is this useful in determining the extent and progression of a disease, but it also helps when targeting specific treatment areas, comparing disease progression, and efficacy of treatment.
Indocyanine green (ICG) angiography is very similar to FA except a different dye is injected. Your doctor may recommend one or both of these photographic evaluations to help make an accurate diagnosis.