Ischemic central retinal occlusion ( CRVO )
-Marked tortuosity and prominence to the venous system.
-The non-ischemic vein occlusion has a better prognosis. It may,
however, with propagation of the clot, progress to become an ischemic occlusion with widespread capillary non-perfusion,
vitreous hemorrhage, and a risk of anterior-segment neovascularization or rubeosis iridis and hemorrhagic glaucoma.