Central Retinal Vein Occlusion and Branch Retinal Vein Occlusion (Retinal Vein Occlusion) By Sonia Mehta, MD, Vitreoretinal Diseases and Surgery Service, Wills Eye Hospital, Sidney Kimmel Medical College at Thomas Jefferson University Reviewed / Revised Apr 2022 | Modified Sep 2022 View Patient Education Etiology Symptoms and Signs Diagnosis Prognosis Treatment Key Points Topic Resources Central Retinal Vein Occlusion Central retinal vein occlusion is a blockage of the central retinal vein by a thrombus.