This will gradually fade. Your pee may be darker than normal for 24 hours after the procedure. This is because your kidneys are filtering the fluorescein dye out of your blood.

A fluorescein angiography is a medical procedure in which a fluorescent dye is injected into the bloodstream. The dye highlights the blood vessels in the back of the eye so they can be photographed.

A fluorescein eye stain test is usually ordered if your doctor suspects you have damage on your cornea or foreign objects in your eye. If you wear contact lenses, your doctor might do this test to ...