Yep, that's typical of floaters. And there's not a damn thing you can do about it.
It's amazing to watch them float back to their original position after rolling your eye. LOL It's the only interesting thing about them.
If I'm observing with my left eye, I have to use averted vision to see finer detail as the floater is smack dab in the middle.
Thus my decision to do astrophotography instead of visual work.
http://en.wikipedia.org/wiki/Floater