A fluorescein angiogram produces photographs (not X-rays) of the blood vessels inside the eye. It can be used to detect the growth and observe the structure of abnormal blood vessels under the retina and to evaluate circulatory and other problems in the eyes.

A green dye called fluorescein is injected into the bloodstream to show abnormal blood vessel growth and leaks in the blood vessels.

A fluorescein angiogram is a simple, relatively painless procedure.