There are two kinds of people in this world: those that buy a new pair of sunglasses every year, maybe even several pairs, and those that find one good pair that they love and try to make them last. If you are part of the second group, you may want to listen up.
A study was recently conducted by researchers at the University of São Paulo in Brazil to see if sunglasses lost their UV-blocking power over time. As it turns out, everyday wear and tear of sunglasses–like throwing them in your bag without a case or accidentally dropping them on the ground–can cause scratches on the lenses that may be gradually diminishing their efficacy.
While this is an interesting finding, there is a lot more research needed to fully understand exactly how long sunglasses can last and what their “expiration date” may be. For now, we recommend that you continue to take good care of your sunglasses while you have them, and don’t hesitate to get a new pair every year or two. Not only will you always be in style, but you can be sure your eyes are properly protected from the sun!