The risk of DR increases the longer a person has diabetes. More than 75% of people who have diabetes for more than 20 years will have some form of DR.
World Health Organization. Prevention of Blindness from Diabetes Mellitus: Report of a WHO consultation. Geneva, Switzerland: WHO Press; 2005. http://www.who.int/diabetes/publications/prevention_diabetes2006/en/. Accessed May 17, 2016