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Central retinal vein occlusion (CRVO) happens when the main vein that drains blood from the retina becomes blocked. Because the retina is responsible for turning light into clear vision, this blockage can quickly affect what you see.

When we think about major eye conditions, it’s easy to assume that serious problems would come with serious symptoms. But retinal detachment can be surprisingly silent in its earliest stages - and when symptoms do appear, they can be subtle.