I was ds with MS in Aug. of 1987 (MRI), but I did not have vision trouble until fall of 1995 when I experienced sharp pain in my left eye with a 24 hr./7 days a week headach. Each day I started seeing a gray spot in a corner of my eye and it kept spreading until gray went to black and I was blind in that eye for about 2 months. Wasn't on any meds. at the time. They ruled out everything else it could be and was left with ON from MS. It is common. Vision came back gradually over time (a few more months), on it's own. I now have an eye Dr. that specializes in auto immune diseases. He explained that an eye Doc. can tell by the nerves in the eyes and a 'pale' color of 'something or other', and the blood vessels behind the eye when MS is 'alive and well' in a person. Even before other symptoms surface for us. He has special digital photos of mine and keeps track for any changes. I can see on the photo the difference between my 2 eyes, and interestingly enough, even though the pain and blindness occured in the left eye, more damage was in the RIGHT eye, which he knew that before even looking in them. That was probably an assult from the MS when I was growing up and had severe headachs.