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What is fluorescein?

Flourescein is a dye used intravenously (IV) or topically to make abnormal features of the eyes easier for the doctor to see. Your doctor may use a test called fluorescein angiography to examine the blood vessels in the retina and the choroid of your eyes. This test uses a special camera, a blue light and IV fluorescein dye. It also helps the doctor see any foreign bodies in this part of the eye. The choroid is the layer of blood vessels that supplies the inner eye with nutrients. Flourescein can be administered topically to the eye to detect cornea damage. The cornea is the eye’s outer surface.

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