Fluorescein angiography of the left eye with papilledema.
Note the progressive increasing hyperfluorescence of the optic nerve with enlarging and blurring of the hyperfluorescent area, consistent with leakage.
Image credit: Mollan SP, Markey KA, Benzimra JD, et al. A practical approach to diagnosis, assessment and management of idiopathic intracranial hypertension. Practical Neurology 2014;14:380-390. Available online.