Central Retinal Vein Occlusion

Central Retinal Vein Occlusion is a topic covered in the 5-Minute Emergency Consult.

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Disease characterized by decreased visual acuity resulting from venous occlusion of any etiology


  • Ischemic CRVO:
    • 20–25% of cases
    • Blocked venous return leads to backflow in capillaries, hemorrhage, and macular edema.
    • Limited space at lamina cribrosa predisposes to thrombosis due to slow flow and vessel wall changes
    • Theorize that arteriosclerotic changes in the adjacent artery may impinge upon the vein.
    • Blood viscosity also thought to play a role
  • Nonischemic CRVO:
    • Milder, incomplete occlusion

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