Diabetes can cause problems in your eyes. Diabetic retinopathy is the most common diabetic eye disease and a leading cause of blindness in the world. Diabetic retinopathy is caused by changes in the blood vessels of the retina. Uncontrolled diabetes can damage tiny blood vessels of the retina. When these blood vessels are damaged, they may leak blood and grow fragile new vessels. When the nerve cells are damaged, vision is impaired. These changes can result in blurring of your vision, hemorrhage into the eye and if untreated, retinal detachment.