Retinal vein occlusion (RVO) is a common cause of painless visual loss that occurs suddenly and can lead to severe loss of vision. It often have related with other significant health problems like high blood pressure, diabetes, and high levels of cholesterol in the blood.
The retina is a transparent layer at the back of the eye that receives visual information and converts it to electrical impulses which is transmitted to the brain via the optic nerve. The blood supply of the retina is predominantly the central retinal artery while the blood flows out via the central retinal vein. Both these blood vessels travel along the optic nerve, which is located at the back of the eye.