Your main line of defense against refracting light.
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Smith Mainline sunglasses are a very good solution to the high-power New Mexico summer sun and blinding glare. I now own two pairs. I am a big fan of these shades.
Slider Mainlines - Third times not the charm.
These are my third set of Smith Slider Mainlines. The first two pair gave up their life saving my vision. Once in a Mountain Biking accident the other when a line trimmer kicked up a rock hard enough to brake the frame. The only difference between this pair and the others is that I have only changed lenses four or five times and the lenses are already scratched, something that never happened with the previous pairs.