management of diabetic retinopathydiabetic retinopathy medicationsproliferative diabeticdiabetic retinopathy surgeryprolific retinopathylucentis diabetic retinopathydiabetic retinopathy cureretinopathy treatmentanti vegf for diabetic retinopathyproliferative diabetic neuropathyperipheral diabetic retinopathyprogressive diabetic retinopathy