Diabetic retinopathy, the most common diabetic eye disease, occurs when blood vessels in the retina change. Sometimes these vessels swell and leak fluid or even close off completely. In other cases, abnormal new blood vessels grow on the surface of the retina. Diabetic retinopathy usually affects both eyes. People who have diabetic retinopathy often don't notice changes in their vision in the disease's early stages. But as it progresses, diabetic retinopathy usually causes vision loss that in many cases cannot be reversed.
As the disease progresses, diabetic retinopathy symptoms may include:
Spots, dots or cobweb-like dark strings floating in your vision (called floaters);
Vision that changes periodically from blurry to clear;
Blank or dark areas in your field of vision;
Poor night vision;
Colors appear washed out or different;
Diabetic retinopathy symptoms usually affect both eyes.