I'm with Sadie Kate on this one. I have only one pair of eyes and I NEED them. I'm not taking any chances on surgery making them worse than they are. But I also need to protect them from glare, and protect myself from the accidents glare might cost. I wear either prescription sunglasses or prescription color-changing glasses when riding. I have one pair of each. I also have one plain clear pair and (as of yesterday) one pair specifically for working on the computer. Yep, it's expensive, but you gotta do what you gotta do and I gotta see to work.

When biking I put on a strap to keep my glasses from sliding off my sweaty head, and I carry the other pair (sun- or color-changing as the case may be) in my hydration pack as a spare.

As I ride more (let's not slip in the lazy temptation of "if" here) I figure I'll look into getting prescription biking glasses. Thanks all above for tips on brands.