Originally Posted by CdCf
My vision is just fine
Put on a regular pair of sunglasses, and move them up and down in front of your eyes. The curvature of the glass makes them enlarge what you see through them, and that distorts your field of view.
If you don't see any difference when you do that, it's your eyes there's something wrong with...
It could be the glasses in your area. The good ones here are designed with the lens curved so that doesn't happen. The first Performance Radials even had that in the paragraph about them.