Fundus photo of normal eye
Retina with CRVO noted by
numerous dark spots of blood
leaking from veins
Central Retinal Vein OcclusionÂ (CRVO)
A blockage causing tiny darks spots, or floaters
Central retinal vein occlusion (CRVO) blocks the main vein in the retina. The blockage causes the walls of the vein to leak blood and excess fluid into the retina. Blood clumps are seen as tiny dark spots, or floaters, causing blurry vision.
CRVO often occurs with glaucoma, diabetes, high blood pressure, and blood disorders. Additionally, it is often correlated with hardening of the arteries and the formation of a blood clot. Working with your general practitioner in order to reduce the above risk factors will help to reduce the risk of CRVO.
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.
There is no identified cure for CRVO; however, laser surgery may be effective in preventing further bleeding, or for treating glaucoma.