Over 3 million people in Canada are diabetic and over 5 million are pre-diabetic. Diabetes can affect the eyes in many ways, although the first symptom diabetics may encounter is fluctuation in vision. As the blood sugar levels in the body increase, it may cause a temporary hyperopic shift in a person’s prescription. While that may not seem too serious, every time it occurs it causes the lens within the eye to fill with water, which changes the uniformity of it. Eventually, this may lead to a cataract or opacity of the lens as well as a permanent decrease in vision. The only way to restore vision would be through surgery.