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What is retinal angiography?

To more closely examine the retina (the back of your eye) and choroid (blood vessels under the retina), your ophthalmologist (Eye M.D.) may use a diagnostic technique called angiography (pronounced an-jee-AHG-ruh-fee).
A colored dye is injected into a vein in your arm, where it travels throughout the blood vessels in your body. As the dye passes through the blood vessels in the eye, a special camera takes photographs of the retina or choroid blood vessels.
Two types of dyes can be injected into the vein: fluorescein (pronounced FLOR-uh-seen) or indocyanine green (ICG).

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