Category A - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed . The retina of your eye is made up of a delicate tissue that is sensitive to light, rather like the film in a camera. It also contains a fine network of small blood vessels. The most serious eye condition associated with diabetes involves the retina, and, more specifically, the network of blood vessels lying within it. The name of this condition is diabetic retinopathy. As the eye condition progresses, it can sometimes cause the blood vessels in the retina to become blocked.