One of the long-term complications of diabetes mellitus is changes in the retina of the eye (diabetic retinopathy). All patients diagnosed with diabetes should perform an ophthalmoscopy with an ophthalmologist. Sometimes diabetic eye complications can be manifest even before diabetes has been diagnosed. Diabetic retinopathy can’t be repaired by managing simple sugar levels! Further, reading glasses have no connection with diabetic retinopathy or its treatment. Reading glasses can only correct prezbiopia (the inability to read from close distances experienced as we age).
Therefore, I recommend you visit an ophthalmologist!!!