Diabetes can affect one’s eyes in many different ways. Some people just come in for a diabetic eye exam and they don’t really have any symptoms at all – everything’s fine. But they should get checked once a year to make sure they’re not developing a problem. Some patients come in because they’ve had a big change in their glasses prescription and they need that adjusted. It’s not unusual for people with diabetes (particularly ones that have sugar that’s pretty poorly controlled) to have rather dramatic swings in their prescriptions.