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Central Retinal Vein Occlusion (CRVO)

A blockage causing decreased vision


Central retinal vein occlusion (CRVO) blocks the main vein in the retina. The blockage causes the veins to leak blood and excess fluid into the retina leading to blurry vision.

Risk factors

CRVO often occurs with glaucoma, diabetes, high blood pressure, heart diseases and blood disorders. It has also been associated with oral contraceptive use and obstructive sleep apnea.


CRVO usually is in one eye, causing a blurring or loss of vision in all or part of the eye. It can be painful because the blocked vein causes pressure in the eye.


The mainstay of treatment is injections of medicine into the eye which have been proven to decrease swelling and improve vision.  Careful observation is required as neovascularization (new leaky blood vessels) can form leading to decreased vision from swelling, vitreous hemorrhage, glaucoma, or tractional retinal detachment.  Laser is sometimes employed to decrease the risk of neovascularization.  Working with your primary care physician to treat the risk factors is also very important not only for the health of your eyes but also for your overall health.

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