--had difficulty adjusting to a new eyeglass prescription, with a little feeling of disorentation/dizziness until my eyes adjusted to the new strenght and focal points of the lenses. Usually, this takes only a day or so to resolve.

As far as the other (EMG) discussion--given that I know Alan's neurology team well (LOL)--I had always suspected that Alan may have two different processes going on (and probably wrote about that at some point). It's entirely possible that he has some radicular compression going on in his lumboscaral spine that is being exacerbated by a further autoimmune process.

Neuropathy from two different processes is certainly possible--in fact the idea of the "double crush phenomenon" points to this, as nerves can be compromised by two different injured areas, or two different causes (i.e., ischemic damage from diabetes along with mechanical pressure from an osteophyte), and while neither alone may have resulted in significant symptoms, together they add up to more than the sum of their individual symptom "parts".