Commuting - Bifocal Safety Sun Glasses

I have been looking for good safety bifocal (2x) sunglasses, and need advice. I googled and ebayed and seen a lot of different ones, but I need personal experiences with durability, scratching, comfort, etc.

What do you all use?

Well, you're going to have to wait a little while for me. I just got some yellow and clear bifocals based on another poster's recommendation from safetyglassesusa.com in the mail today. They fit comfortably, and the little magnifier portion works perfectly without being intrusive. I can read my cycle computer and a map. I don't know how scratch resistant they are yet, but for 10 bucks a pair, I'm just going to order a few more pair and consider them disposable. I normally either sit on or lose sunglasses before they actually become unusable from scratches.

Eric

clip-ons from Costco!!! $13 they go over my bifocals

I used these (http://safetyglassesusa.com/bf10.html) when I was in construction, they didn't seem to scratch too badly. They were great for reading the tiny print used on building plans