<prompt> Which of the following factor is related to diabetic retinopathy?Duration of diseaseSeverity of diseaseFamily historyControl of diabetes  <response>: Duration of DM and degree of glycemic control are the best predictors of the development of retinopathy; hypeension is also a risk factor. Nonproliferative retinopathy is found in many individuals who have had DM for 20 years 25 incidence with 5 years, and 80 incidence with 15 years of type 1 DM. Although there is genetic susceptibility for retinopathy, it confers less influence than either the duration of DM or the degree of glycemic control. Ref: Powers A.C. 2012. Chapter 344. Diabetes Mellitus. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo Eds, Harrisons Principles of Internal Medicine, 18e. 