Fluorescein angiography is an extremely valuable test that provides clinical information about the circulatory system of the ocular fundus (the back of the eye) not attainable with a routine examination. The test is performed by injecting a special dye called sodium fluorescein into a vein in the arm. In few seconds, the dye travels to the blood vessels inside the eye. A camera equipped with special filters that highlight the dye is used to photograph the path of the fluorescein as it circulates though the eye.
It highlights retinal and choroidal circulation which helps in determining early vascular pathologies, vascular filling defects, obstruction and leakage.