What best describes the action of fluorescein angiography?

Fluorescein angiography is a diagnostic technique primarily used in ophthalmology to visualize the blood vessels in the retina and choroid by injecting a fluorescent dye, fluorescein, into the bloodstream. As the dye circulates through the blood vessels, a special camera takes sequential images, allowing for the observation of blood flow and any abnormalities such as blockages or leaking vessels. This imaging is crucial in managing various eye conditions, including diabetic retinopathy and macular degeneration, since it provides detailed insight into the vascular health of the retina and surrounding tissues. The ability to see blood flow and assess any potential complications makes it a valuable tool in diagnosing and monitoring diseases that affect the eye.