Non ischaemic CRVO :
In early cases, mild venous congestion, tortuosity, few superficial hemorrhages more in the peripheral than the posterior retina, mild papilloedema and mild or no macular oedema.
In late stages, there appears sheathing around the main veins and a few cilioretinal collaterals around the disc.
Ischaemic CRVO :
In early cases, massive engorgment, congestion and tortuosity of retinal veins, massive retinal hemorrhages whole fundus is full of hemorrhages giving a splashed tomato appearance, numerous soft exudates and papilloedema.
In late stages, marked sheathing around the veins and collaterals is seen around the disc. Neovascularisation may be seen at the disc or periphery.