Adults with diabetes should have yearly eye exams to ensure the health of their eyes and to protect their vision.

Over time, high blood sugar levels can damage the blood vessels that feed the retina of the eye. In nonproliferative diabetic retinopathy (NPDR), an early stage of diabetic eye disease, the blood vessels may leak fluid. This may cause the retina to swell and vision to blur, a condition called diabetic macular edema. In advanced or proliferative diabetic retinopathy (PDR), abnormal new blood vessels grow on the surface of the retina. The abnormal blood vessels don't supply the retina with normal blood flow. In addition, they may eventually pull on the retina and cause it to detach.

Some cases of diabetic retinopathy can be treated with laser surgery. In this procedure, doctors aim a strong beam of light onto the patient's retina to shrink or seal lea king or abnormal vessels. Laser surgery can't restore vision already lost, so early detection is important. In some advanced cases of PDR, a surgeon may remove the vitreous portion of the eye and replace it with a clear solution (called a vitrectomy).

It is well known that one of the early signs of untreated diabetes is deteriorating vision. Patients regularly go to the eye doctor complaining of vision problems, only to discover upon testing that the real problem is a much more serious one than simple aging of the vision processes.