Indocyanine green (ICG) angiography
Angiography is a test performed to look for abnormal blood vessels under the retina and/or to identify conditions that can cause retinal swelling and reduced vision.
Indocyanine green (ICG) angiography is a particular type of angiography used in patients with certain types of age-related macular degeneration to determine whether they might have the characteristics required to be a candidate for laser treatment. It is often used following or in conjunction with a fluorescein angiogram.
A water-soluble dye is injected into a vein in the patient’s arm. The dye quickly passes through the circulation to the eye and photographs taken in a rapid sequence reveal any leaking blood vessels. This test does not involve any x-rays and is quite safe. Patients with a known iodine or shellfish allergy should report this to the physician prior to ICG testing. These patients will be pre-medicated to eliminate the risk of a severe allergic reaction.