What’s best: Shatterproof glass? Plastic? Some new-fangled polycarbonate material? Again, it’s a matter of personal taste. How well they help you see matters a lot, too. With some lenses, especially the more curved ones, you can get some distortion. But that’s not always the case.
“If you’re stopping by the gas station on the way to the lake to pick up sunglasses, you’re more likely to have something of lesser quality,” Horn says. “But something that’s more expensive doesn’t necessarily mean that it has great image quality.”