Why You Regularly Need to Replace Your Sunglasses

Did you know that sunglasses, or at least sunglass lenses, regularly need to be replaced? According to a study conducted at the University of São Paulo, the UV protection that sunglasses provide deteriorates over time. If you've been wearing the same pair for two or more years, it might be time for a new pair.

UV Light and Sunglasses

The protective efficacy of your sunglasses comes in large part from the lens coating of dyes and pigments that reflect and absorb ultraviolet radiation. However, this protective coating can break down over time. Wear and tear can cause tiny abrasions, compromising its UV-blocking power. The more sunlight the lenses are exposed to, the more rapidly they'll become ineffective.

Why It's Important to Protect Your Eyes From UV

Protecting your eyes from the sun is critical no matter where in the world you are. UV exposure places you at risk for developing eye diseases like eye cancer, pterygium, cataracts, and macular degeneration — which cause vision loss and, in severe cases, blindness. Even short-term overexposure can result in photokeratitis, a corneal sunburn.

What to Look for When Getting New Sunglasses

When choosing new sunglasses, make sure they're labeled 100% UV protection or UV400. Cost, polarization, lens color, or darkness don't have much to do with the level of UV protection. Keep in mind that there is a lot of counterfeit sunwear in the marketplace — if the price of a renowned brand seems too good to be true, it's probably a fake.

For more information about UV safety, or to get the perfect sunglasses tailored to your vision needs and lifestyle, contact St. Clairsville Eyecare in St. Clairsville today. Call (740) 695-0444.