Test: Fluorescein Angiography

This technique is used to study the blood vessels in the light-sensitive retina of the eye. A fluorescent dye (fluorescein) is injected into the circulatory system through one of the veins in the arm. As the dye passes through the retinal vessels, a series of photographs (fluorescein angiograms) is taken to define any underlying abnormalities. The ophthalmologist can then assess the extent of the damage. The test is painless, but your skin and urine may turn dark yellow until all the dye has been excreted.

During the test

The pupils are dilated with eyedrops, and fluorescein dye is injected into a vein in your arm. The dye then circulates in your bloodstream. When the dye reaches your eye and is moving through the retinal blood vessels, a series of photographs is taken.

From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.

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