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What Is Ischemic Central Retinal Vein Occlusion?

Ischemic central retinal vein occlusion (CRVO) occurs when the main retinal vein becomes severely blocked, reducing blood flow and oxygen to the retina. This causes swelling, hemorrhages, and rapid vision decline. People often notice sudden blur or dark areas in one eye. Exams show extensive bleeding and poor perfusion. This form of CRVO carries a higher risk of complications than the non-ischemic type.

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What Is Ischemic Central Retinal Vein Occlusion?

Ischemic central retinal vein occlusion (CRVO) occurs when the main retinal vein becomes severely blocked, reducing blood flow and oxygen to the retina. This causes swelling, hemorrhages, and rapid vision decline. People often notice sudden blur or dark areas in one eye. Exams show extensive bleeding and poor perfusion. This form of CRVO carries a higher risk of complications than the non-ischemic type.

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What Causes Ischemic CRVO?

Vascular conditions such as hypertension and diabetes increase risk. Glaucoma can compress the vein and slow drainage. Blood disorders may increase clotting. Aging weakens vessel walls, making blockage more likely. Identifying systemic contributors helps guide therapy.

Symptoms of Ischemic CRVO

People notice sudden, dense blur in one eye. Central vision may drop significantly. Dark spots or floaters may appear from retinal bleeding. Pain is uncommon unless pressure rises. Symptoms worsen as swelling increases.

How Is Ischemic CRVO Diagnosed?

Fundus exam shows hemorrhages and cotton-wool spots. Fluorescein angiography highlights areas of poor perfusion. OCT imaging measures retinal swelling. Pressure checks help detect secondary glaucoma. Diagnosis determines prognosis and treatment timing.

How Is Ischemic CRVO Treated?

Injections help reduce swelling and stabilize vessel leakage. Laser therapy may be used if new abnormal vessels form. Systemic management of blood pressure and glucose supports recovery. Monitoring is important because neovascular complications can appear. Treatment focuses on preventing further vision loss.

Frequently Asked Questions About Ischemic CRVO

Does vision return?

Some improvement occurs, but outcomes vary.

Can it cause glaucoma?

Yes. New vessels can block drainage.

Is it painful?

Usually not unless pressure rises.

When should I seek care?

Seek care for sudden blur or dark patches.