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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. ...
A retinal vein occlusion is a blockage of one of these veins. The vein blocks when the blood in it stops flowing, and the vein cannot then drain the blood out of the retina. If the vein blocks some blood then leaks out of the vein. Also, clear fluid leaks out causing âwater-loggingâ the retina.