BTW I just bought a $27 wrap-around type of sporty sunglasses from MEC and wore it for a while on the sidewalk. But the image was slightly distorted especially when I looked down at the sidewalk and after a while I felt slightly dizzy. I think I'm going to get a refund and invest in high quality sunglasses, unless the curve of the model is not that accentuated.

I've heard the justification for high prices from companies such as Oakley is that they use a completely different method, that they mold the lens instead of bending it, or something like that.