Hi, I'm (R) handed, my first MS sx's were (L) neck & arm numbness. At this stage only lesions in c spine. Sx's eventually spread to (R) side.
Several years later I had ON (L) eye, and 3 months after that in the (R) eye - and much worse, but by then I also had brain lesions. Hope this helps.
I'm off to check my (L) breast!