Looking for more of the best cheap sunglasses? Start with our guide to the foremost UV-blocking brands on the planet—and check out our list of summer menswear essentials while you're at it.

The technology behind shades has changed over the centuries. From Inuit snow goggles to aviators to polarized sunglasses.

But when we buy a cheap pair of knock-around glasses from ... to ophthalmologists about what to look for when buying a pair ...