Figure 2. Fundus images during fluorescein angiography of a retina that is exposed to high intraocular pressure (80 mmHg). A: At 80 mmHg blood flow was completely obstructed. The intraocular pressure (IOP) was then gradually reduced and the following events were observed: (B) hyperfluorescence of the optic nerve head and filling of the large blood vessel of the choroidal circulation; (C) distinct pulsations and slight filling of the retinal arteries (at this stage, medium-sized choroidal vessels, but not choriocapillaries, were perfused); (D) blood flow through the arteries was then restored, but still no venous filling; (E) micro-emboli were seen to move slowly out of the veins to allow reperfusion; (F) and finally, background fluorescence after angiography.