sounds to me like the 35 yr of epliepsy might be the result u have. What did your dr say? or the radiologist. They tell the findings and the possible diagnosis. Are u asking if diabetes causes blindness? It can with very uncontrolled diabetes, I am sure it has to go on for quite a long time. Sometimes very high blood sugar can cause the sight to get very bad, and low can do the same. wow how did u get your a1c down so fast? what is your secret?