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MVR Mohawk Valley Retina

How The Eye Works  
The Retina  
The Vitreous  
Flashes and Floaters  
Retinal Tears  
Retinal Detachment  
Macular Degeneration  
  Diabetic Retinopathy  
  Macular Hole  
  Central Serous Retinopathy  
  Epiretinal Membrane  
  Cystoid Macular Edema  
  Central Retinal Vein Occlusion  
  Branch Retinal Vein Occlusion  
  Ocular Inflammation  
  Optic Nerve Disease  
  Intravitreal Drug Therapy  
  Retinopathy of Prematurity  


Central Retinal Vein Occlusion.

Central Retinal Vein Occlusion (CRVO) occurs when the main retinal vein is blocked. Because the blood can no longer travel out of the retina smoothly, the retina becomes filled with blood and swollen. If the blockage is partial, the retina may continue to function adequately. If the blockage is more severe, permanent retinal damage may occur with loss of vision. Central retinal vein occlusions occur most commonly in people who have high blood pressure, diabetes or glaucoma. Occasionally, the damage to the retina will result in abnormal new vessel growth. Further visual loss can occur if these abnormal blood vessels break and bleed into the vitreous cavity, causing a vitreous hemorrhage.

Neovascular Glaucoma
Neovascular Glaucoma is a condition in which abnormal blood vessels grow on the iris or colored part of the front of the eye. These abnormal blood vessels can block the flow of fluid from the eye and cause the eye pressure to become very high. Neovascular glaucoma can cause pain, halos around lights, and rapid loss of vision. Prompt laser treatment, intravitreal medication, and sometimes surgery is required to reduce the risk of blindness.

Symptoms of CRVO
Patients with central retinal vein occlusion usually have blurred vision from retinal hemorrhage and swelling. Spots, strands or curtains in the vision may occur due to vitreous hemorrhage. Eye pain may be caused by neovascular glaucoma.

In addition to a dilated eye exam, a test called Fluorescein Angiography may be required. During this test a dye is injected into a vein in the arm. Special photographs are taken of the retina as the dye passes through the eye. Blocked or abnormal blood vessels will become detectable to the physician. Optical Coherence Tomography (OCT) may be performed to determine if macular edema is present. These tests aid the diagnosis and may help determine the type of treatment needed.

Presently there is no proven treatment for CRVO. When CRVO causes complications such as abnormal new blood vessel growth, laser treatment to reverse the growth of new blood vessels is often required. If untreated, these abnormal blood vessels can cause vitreous hemorrhage and glaucoma. Intravitreal medications may be recommended in some cases to cause regression of new blood vessels and resolution of macular edema (see section on Intravitreal Drug Therapy).

For information on Avastin for Retinal Vein Occlusions click here.

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