Fig. 1

Slit-lamp microscopy revealed dilated and tortuous conjunctival vessels in all four limbal quadrants of the eye, especially in the nasal (a) and superior quadrants (c) in the left eye of the patient with the dural carotid-cavernous fistula. Optical coherence tomography angiography allows for delineation of the deeper dilated episceral veins in the corresponding quadrants (b & d). The aquous humour enters the Schlemm canal through the trabecular meshwork and intrascleral emissary channels to empty into the episcleral venous plexus