Hello @taldavs, Welcome to Mayo Clinic Connect. I know it can be frustrating when the doctors are not able to diagnose the cause of your optic nerve damage. Have you thought about seeking a second opinion or help at a teaching hospital or a major hospital like Mayo Clinic? If you would like to seek help from Mayo Clinic, contact one of the appointment offices. The contact information for Minnesota, Arizona and Florida can be found here http://mayocl.in/1mtmR63.