What are the visual symptoms of diabetes?

While diabetic eye disease often presents with no symptoms, some patients experience fluctuations of vision due to changing glucose levels within the tissues of the eye. Should retinopathy develop and progress without detection and treatment, the results can be devastating. In fact, diabetes is the leading causes of preventable blindness in working-age adults in North America, a trend that shows no sign of changing. Between 1995 and 2005, the number of Ontarians with diabetes increased by nearly 70%, and doubled in the population under age 40.