Diabetes, a disorder of metabolism, results in excessively high levels of glucose in the blood. This in turn can lead to multiple problems throughout the body and the eyes in particular. Often the very earliest sign of diabetes is a change in vision that is caused by the elevated blood sugar. Fortunately, this is a completely treatable condition. However, more serious conditions may develop over time, including cataracts, double vision, glaucoma, and diabetic retinopathy. The best way to manage these potential complications is by controlling blood glucose levels through diet, medication, and exercise. It is also important to maintain control of your blood pressure and schedule regular eye examinations with a qualified doctor of ophthalmology or optometry.