What Is Retinal Vein Occlusion? Arteries supply the retina with blood, and veins carry blood away. Sometimes, a vein becomes partially or completely blocked. This is called retinal vein occlusion, or ...

The retina is the innermost layer of the eye, which is involved in receiving visual input and sending the light signal to the brain via the optic nerve. The blood supply to the retina is provided via ...

Whenever you see blood outside your body, it looks red. Why? Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that’s crucial for carrying oxygen ...