There are several types of eye occlusion depending on the different location: Branch retinal artery occlusion, Branch retinal vein occlusion, Central Retinal Artery Occlusion, Central Retinal Vein Occlusion. Different type may have different cause and symptom, such as BRAO is usually caused by a small clot. A BRAO can cause a sudden loss of peripheral vision, BRVO can cause a small clot in a retinal vein. CRAO can cause sudden, serious, but painless loss of vision in one eye and CRVO causes mild to severe sudden but painless loss of vision.
