Lol.
Obviously polarized. And avoid photochromic polarized (polarization isn't as good).
But in the Rx world things are more complicated, for sure. First, pretty much nobody does glass. Your prescription is probably going to lock you into a material, and they will all be some variety of plastic (poly, trivex, etc). Second, your prescription will also limit you to which frames are available. If you are a high Rx, you may not be able to get a wrap style lens, may not be able to get a large lens, etc. Third, some shops make their own lenses. They might sell you a pair of costa's or Smith's, however, what you just picked out was a frame. And the shop itself might make their own lenses to fit that frame. Very hit or miss depending on the quality of that lab. Ironically, some of the smaller shops may be better (but more $$$) because they don't make their own lenses, they will send the prescription out to Costa or Smith to have done at their lab, and those places do consistently good work (not to say a local shop can't do just as well, but again, it's hit or miss).
I do believe MJ is either alone or one of only a few that requires that their lab do the Rx lenses for their frames. A MJ dealer isn't allowed to make their own lenses and put it in an MJ frame. They are consistently regarded as THE most advanced, highest quality lab for Rx sunwear. But, the price might make ya blush. And nobody is saying you can't role the dice and get nearly as good quality at a 3rd of the price from Joe Schmoe's optical who buys polarized blanks from Essilor or someone like that, then grinds, tints, cuts, and coats his own lenses in his own lab. It depends on whether Joe buys high quality blanks, how good his equipment is, what your prescription is, and what frame you chose. If you have a relatively light prescription, and choose a small, fairly flat lens, and ask for anti-glare coatings, scratch coatings, etc., and Joe's equipment is modernized, his lab might make an amazing lens for you rivaling anything out there at a downright good cost. But spending the dime and getting it through MJ, if you can, takes away the gambling factor, you know it's going to be top of the line, and they'll probably be more willing to do something a little harder, like a really high Rx in a wrap, and do it well. Same would be true with Smith, Costa, etc. if you demand that the optician send it to Smith, Costa, etc. to make the lens (and he'll be like, ok, that's 3x the price).
