Over time, high blood sugar can damage the small blood vessels in the retina, the light-sensitive layer at the back of the eye. This is called diabetic retinopathy. In its early stages it causes no symptoms, so you cannot rely on your vision to tell you it is there.
Regular eye examinations, including a careful look at the retina, find changes early. Most people with diabetes need one at least once a year, and we will tell you if you need to come more often.
Keeping your blood sugar, blood pressure and cholesterol under control, and not smoking, lowers the risk. Diabetes also makes cataract and glaucoma more likely, which your examinations check for as well.
Your vision can blur for a while when blood sugar is high or changing, for example after a new diagnosis or a change in treatment. It is best to wait until your sugar is stable before getting new spectacles.
If you suddenly lose vision or notice a shower of new floaters, seek help the same day.