Retinal vascular occlusion is a condition that specifically affects the retina of the eye. The retina is vital to your vision because it converts the light you see into neural signals. The neural signals tell your brain what you see. The retina requires a constant blood supply fed by the body’s vascular system through arteries and veins. When one of these vessels becomes blocked, or has a blood clot, this is called an occlusion. There are two types of occlusion: