Such treatment usually does not reverse existing damage but may slow the progression of the disease. Laser surgery may be indicated to control scar tissue or bleeding. A routine eye examination by an ophthalmologist once per year is indicated for people with diabetes. The outcome may be improved by good control of diabetes and high blood pressure . Vision impairment usually becomes evident after 10 years and is nearly universal in people who have diabetes mellitus for more than 30 years.
Diabetic retinopathy can lead to blindness .