eye disorders
Blockage of Central Retinal Veins and Branch Retinal Veins
Symptoms
Blockage of the central retinal vein causes severe, painless, and usually sudden loss of vision, but vision loss can also sometimes occur gradually over a period of days to weeks. Blockage of the central retinal vein may also cause growth of abnormal blood vessels on the retina or iris. Sometimes, these abnormal blood vessels bleed or cause a painful type of glaucoma (called neovascular glaucoma). In neovascular glaucoma, abnormal blood vessels that have formed in the iris close the space between the iris and the cornea, blocking the drainage of fluid from the eye and causing buildup of pressure in the eye ( Glaucoma ). 