I have a pair of Oakleys that I mangled in the rear hatch of a rental SUV. I bent them back into shape (you can't even tell by looking at them) but they are much tighter now on my head which is actually better for cycling because they don't slide down my nose at all. I rode the other day with my polarized Ray Bans but they kept sliding down my face so I was constantly pushing them back up which is really annoying.

I've been riding long relatively flat rides so my max sustained speed is around 20mph. I have no problems with wind at that speed.