Retinal Vein Occlusion (RVO) is a condition where a vein in the retina becomes blocked, disrupting normal blood flow and leading to vision impairment. There are two main types: Central Retinal Vein Occlusion (CRVO) and Branch Retinal Vein Occlusion (BRVO). RVO can cause retinal swelling, bleeding, and damage to retinal cells. Treatments include laser therapy, intravitreal injections, and managing underlying health conditions.