I’m one of those people who can buy a pair of sunglasses and not lose them within two months. I was very happy with my previous pair of sunglasses, until one of the snap-in lenses broke and the company was no longer making those lenses. (I did have them for more than 10 years, but they were about $180, so …) Since that happened nearly 2 years ago, I’ve tried on countless pairs, and bought a…