The central retinal vein is a major blood vessel in the eye that drains deoxygenated blood from the retina, the light-sensitive layer at the back of the eye. It runs through the optic nerve and connects to the jugular vein, which carries blood back to the heart. Proper functioning of this vein is essential for maintaining healthy retinal tissue. When the central retinal vein becomes blocked, a condition known as central retinal vein occlusion can occur. This blockage can lead to vision problems, as it may cause swelling and bleeding in the retina. Early detection and treatment are important to prevent permanent damage to vision.