I think this report is worth reading, but it's also worth bearing in mind who "supported" this study, (the manufacturers: it's in the last few lines)...
<http://www.eurekalert.org/pubnews.php>Public release date: 16-Apr-2007
Contact: Kate Olderman
University of Pennsylvania School of Medicine <http://www.med.upenn.edu/>
Penn researchers find treatment for MS also reduces vision loss in MS patients
First MS study ...