The retinal vein occlusion (RVO) is the second most common retinal disease after diabetic retinopathy, and is a common cause of unilateral visual loss. The occlusion of a branch of the central retinal vein (BRVO) and central retinal vein occlusion (CRVO) are two topics discussed and very deserving of further study, especially for the need of greater clarity arising from the availability of new diagnostic and especially therapeutic opportunities.