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Retinal cysts as in cystoid macular edema occur in the center, cause blurring and are due to inflammation, usually after surgery. Cysts in the peripheral retina are quite normal and are sometimes called cystic retinal tufts. Occasionally, cystic tufts can be torn by acute vitreous separation causing a retinal tear which may be lasered to prevent detachment. ...
The blood then leaves the retina via the vein. The central retinal vein is located very close to the eye nerve (optic nerve). What is Central Retinal Vein Occlusion? Central Retinal Vein Occlusion (CRVO) is caused by a blood clot in the vein that drains the blood from the retina of the eye. The artery brings continuous blood to the retina but the blood can not leave the retina because of the block in the vein.