The obstruction of one or more branches of the central retinal vein is known as Branch Retinal Vein Occlusion (BRVO). The retina plays a crucial role in vision. The retina needs a constant supply of oxygen and nutrients provided by blood vessels. One major artery brings oxygen-rich blood to the retina, and one major vein carries deoxygenated blood away from the retina. The artery enters the eye through the optic nerve and then branches into smaller vessels throughout the retina. The artery and the vein have smaller branches that spread throughout the retina, ensuring that all parts of the retina get oxygen and nutrients through the blood supply.

This fact sheet is part of our Ophthalmology and Optometry Information Guide series, developed to help people understand eye conditions and their impact on navigating the built environment.