Hi let me knw was it in retina or brain (the vein block)....If it was in retina den u may be having increase in eye pressure (secondary glaucoma) which is a serious problem.also is there any cause for the vein block like BP sugar other medical problems? It needs a thorough retinal evaluation with vision and eye pressure check up.....and laser if required.further details -vikhyath eye retina centre kalyan nagar Bangalore