What is fluorescein angiography primarily used for?

Fluorescein angiography is primarily used to visualize the blood vessels in the retina and choroid, providing critical information about the blood flow within these structures. By injecting a fluorescent dye (fluorescein) into a patient's bloodstream, the angiography allows practitioners to capture images of the retina and detect any abnormal conditions. This includes identifying blockages or leaks in the blood vessels, which can be indicative of diseases such as diabetic retinopathy, macular degeneration, and retinal vein occlusions.

This technique is invaluable in the management of various ocular conditions, as it helps in assessing the extent and severity of vascular issues in the fundus, which can lead to vision impairment or irreversible damage if not addressed. Thus, the primary purpose of fluorescein angiography is to visualize blockages and abnormalities in the fundus blood vessels, aiding in accurate diagnosis and treatment planning.