Hi,
I was also seen at Mayo several years ago and they diagnosed me with MG. I saw a neuro-ophthalmologist for my first appt. and then saw the neurologist later in the day. That was helpful b/c she was aware of the positive tensilon test from their neuro-op and took that into consideration when some of my other tests were not definitive. I hope that you'll be seen by a neuro-op also since you are having vision issues.
Cate