Diabetes and Your Eyes
For some individuals, diabetes mellitus can cause loss of vision and even blindness. However, studies performed in the United States and the United Kingdom have shown that very good control of blood sugar can slow the development of complications due to diabetes. Individuals with newly diagnosed diabetes are also at increased risk for developing glaucoma, a disease that can lead to permanent loss of peripheral vision.
See more at: http://www.for-diabetes.com/diabetes-and-your-eyes