Fluorescein Angiography / Indocyanine Green Digital Angiography
Fluorescein Angiography is a diagnostic procedure, which uses a special camera to take a series of photographs of the retina, the light sensitive tissue in the back of the eye. A special water-soluble dye (Fluorescein) is injected into a vein in the arm. The dye travels through the veins and into the arteries, which circulate throughout the body. As the dye passes through the blood vessels of the retina, a special camera flashes a blue light into the eye and takes multiple photographs of the retina.
If the blood vessels are abnormal, the dye may leak into the retina or stain blood vessels. Damage to the lining underneath the retina or the appearance of abnormal new blood vessels growing beneath the retina may also be revealed. The precise location of these abnormalities can be determined by a careful interpretation of the fluorescein angiogram by your physician.
Indocyanine is a green dye, which fluoresces with invisible infrared light; it requires a special digital camera that is sensitive to these light rays. The Indocyanine Green Angiogram is often better for studying the deeper choroidal blood vessel layer. Certain eye disorders are usually imaged with the fluorescein. Indocyanine is especially helpful when there is a leakage of blood, which makes interpretation of fluorescein studies difficult.
Both of these tests are considered safe and serious side effects from these tests uncommon. However, there is possibility that there may be a reaction to the dyes.