Branch retinal veins are small blood vessels located in the retina, the light-sensitive layer at the back of the eye. They are responsible for draining blood from the retina and returning it to the heart. These veins branch off from the main retinal vein and play a crucial role in maintaining proper blood flow and oxygen supply to the retinal tissue. When branch retinal veins become blocked, a condition known as branch 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 potential vision loss.