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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. ...
Retinal artery occlusion occurs due to blockage of the retinal artery, often by an embolus (a small piece of cholesterol that blocks blood flow) or thrombus (blood clot). The retinal artery occlusion may be transient and last for only a few seconds or minutes if the blockage breaks up and restores.