Well, yes, high blood sugar can lead to double vision in some degree. As we know that high blood sugar is a medical condition which is referred as hyperglycemia. And you should also know that it occurs when you have abnormally high levels of sugar within your blood. According to some experts, high blood sugar levels can damage blood vessels and cause changes in vision to develop in certain people. And then it can cause blurred or double vision. Also, changes in your vision can lead to additional symptoms, such as dizziness, lightheadedness or headache. By the way, there are also a variety of symptoms, such as excess food consumption, stress, infection, diabetes. Anyway, you should control your sugar intake, and also just console the doctor. He can tell you what to do.