I got a pair of Gatorz Magnums with Prescription lenses at www.MetalSunglasses.com a couple of months ago. They have a nice guy working there that I used a while back also for a pair of Prescription OutLaw Eyewear Fugitive glasses. He knows a lot, and they have many options to choose from.
They only have shatter resistant lenses, so they cost a few bucks more than what you can get at the cheaper places, but I rather have the safety of the pricier lenses.
I paid $165, and it was great.
The lenses are very clear, and I can see out the sides very well.
I bought this sunglass as it is the same sunglass that Ben Foster wears in the movie Lone Survivor. I am totally bad ax now, like the Navy SEALS, well, maybe not.