Diabetic retinopathy is a diabetes-related eye disease that occurs when high blood sugar damages the tiny blood vessels in the retina, the light-sensitive tissue at the back of the eye responsible for vision. Over time, these damaged blood vessels may leak fluid, bleed, or become blocked, affecting the retina's ability to function properly.In the early stages, diabetic retinopathy often causes no noticeable symptoms, which is why many people are unaware they have the condition until vision problems develop. As the disease progresses, abnormal new blood vessels may grow on the retina, increasing the risk of bleeding, retinal detachment, and permanent vision loss.Diabetic retinopathy is one of the leading causes of blindness among working-age adults, but with regular diabetic eye exams, early detection, and timely treatment, much of this vision loss can often be prevented.