When it comes to your eyes, knees, back and ears, DONT GO CHEAP. Once its lost its gone forever.
Oakley, Ray Ban etc, the top of the line luxottica type companies put millions into research. And your eyes benefit.
Go with the cheap $5 glasses, and reap the rewards of refracted vision and UV penetration.
This pair of M Frames stopped shrapnel from getting into my eye. It did penetrate the rest of my body though.
