Eu am cautat pe net şi am gasit explicatia aceasta: "Diabetic retinopathy is caused by high blood sugar due to diabetes. Over time, having too much sugar in your blood can damage your retina. Diabetes damages blood vessels all over the body. The crystalline lens can enzymatically convert glucose to sorbitol, which is one of the many mechanisms that will eventually result in cataract formation.Diabetes can lead to swelling in the macula, which is called diabetic macular edema. Over time, this disease can destroy the sharp vision in this part of the eye, leading to partial vision loss or blindness. Macular edema usually develops in people who already have other signs of diabetic retinopathy. "