I get ON all the time! its outrageous and I wish it would leave me alone. its one of my triggers for flares, and it is destroying what little vision I have.

I have lesions on BOTH optic nerves, so they behave quite badly when I am stressed, or over heated, or tired. it is said that the optic nerve is covered in that same fatty mylin as the brain, and MS likes that stuff.

The GI tract is also covered in a fatty substance that is similar to mylin and MS frequently can attack the GI tract and create all sorts of issues. I have alot of tummy troubles too.

I hope you never have to experience ON. its frequently one of the first or hallmark sx that someone has MS to start with.