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 rocking those shades for two or more years, it might be time to get a new pair.

In addition to the UV-blocking properties, anti-reflective and anti-scratch coatings wear down, and the frame material may become brittle over the years too. Even if you have the most durable sunglasses available, regular lens-replacement is the best way to ensure that your vision is maximally protected from the harmful effects of ultraviolet light.

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, and often does, break down over time. Wear and tear can cause an invisible web of tiny abrasions, compromising its UV-blocking power.

A pair of shades worn on occasion and in mild conditions is likely to remain effective longer than a pair that is heavily used in a more intensely sunny environment.

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, as UV exposure places you at risk for developing eye diseases like eye cancer, pterygium, pinguecula, cataracts and macular degeneration — which can cause vision loss and, in severe cases, blindness.

What to Look for When Getting New Sunglasses

When choosing new sunglasses, make sure they're labeled 100% UV protection or UV400. Keep in mind that factors like cost, polarization, lens color, or darkness don't have much to do with the level of UV protection. Bigger is definitely better if you spend a lot of time outdoors. Larger wrap-around eyewear is best if you regularly ski or spend many hours in the water.

To find out whether it's still safe to wear your favorite shades, visit a Grove City eye doctor to determine whether your lenses still offer the right level of UV protection. For more information about UV safety, or to get the perfect sunglasses tailored to your vision needs and lifestyle, contact Grove City Vision Center in Grove City today!