Eye exam, symptoms. It is recommended to do periodic eye exam to be fully evaluated. Diabetic retinopathy may be a slow process with no initial symptoms, so ophtholmologic exam will reveal at what stage your eyes are and will compare on the follow up exam. However if you are experiencing symptoms, see your doctor soon at any time.
Check with eye MD. A physician should dilate the eyes and examine the retina, and rest of eye. Minimum, once per year.