1. Look for a label
Sunglasses should have lenses that block 99 to 100 percent of both UVA and UVB rays, and they need to carry a tag or sticker stating they do. Fortunately, you don’t have to pay a lot to get this level of protection. “The industry standard is such that even less-expensive sunglasses are made to block this much UV,” says Dr. Monica. That means whether you purchase your pair at a department store or drugstore, or in a high-end boutique, your eyes will be safe if you seek out these tags.
2. Get wraparound frames
Oversize lenses may be back in fashion, but they’re more then just stylish—they also offer more protection for your eyes and the skin around them. Shades that curve or wrap around the sides are even better, because they keep sunlight from sneaking in through the sides. It’s also wise to wear a wide-brimmed hat when in the sun, which should stop light from entering into the eye area from above.
3. Consider extra features
High-end frames won’t offer any more protection than a cheap pair that blocks 100 percent of UV rays, but they may have extras that make your eyes more comfortable when in the sun—and thus make you more prone to wearing them, according to Dr. Monica. Polarized lenses, for example, help reduce glare. Just make sure they’ve also been treated with UV protection, as some shades are just polarized. Blue-blocking glasses, which typically have yellow or orange lenses, make distant objects easier to see and sharpen the contrast in colors, so they’re great for seeing in fog and haze.
4. Seek out recycled shades
While buying secondhand shades might seem like the greenest way to go, Dr. Monica advises against buying used frames unless they are marked with a sticker that says they block the proper amount of UV. If there isn’t a tag, you can’t be sure they’re protective unless you bring them to an eye-care expert who can check them with a photometer. If it’s time for a new pair and you want an ecofriendly choice, ICU Eyewear makes sunglasses from reclaimed materials that cost only $21.95. And iWood’s frames are made from sustainable wood, though the price ($350) is pretty steep.
5. Repair or donate instead of tossing
It is possible to have sunglasses repaired by a professional, so if you spent enough on nice shades, bring them to an expert who may be able to buff out scratches or repair broken parts. When they’re beyond repair, though, don’t just toss them in the trash. Keep them out of the landfill and give them a second life by donating them instead. The Lion’s Club and Unite for Sight both accept gently used sunglasses and send them to those who are unable to purchase their own pair, both in the U.S. and abroad.
Keep Reading: How to Avoid Dangerous Sunscreen