For shielding eyes from sunlight, not all sunglasses are created equal. In the July issue of Mayo Clinic Women's HealthSource, Amir Khan, M.D., Mayo Clinic ophthalmologist, discusses some considerations for purchasing sunglasses to help ensure good eye health.
Ultraviolet (UV) light rays from the sun not only can damage the skin, they can also harm the eyes. Long-term exposure to UV light increases the risk of cataracts, a clouding of the eye's lens. Some experts believe UV rays increase the risk of macular degeneration, a chronic disease that affects the central vision.
Sunglasses are an easy and effective way to protect against UV rays. "It's best to wear sunglasses any time you're outside and need sun protection," says Dr. Khan. He offers tips for purchasing sunglasses:
- Label check: Look for sunglasses that block both UVA and UVB, the two types of UV rays found in sunlight. The sunglasses should block 99 to 100 percent of these rays. If the label or sticker has no UV information, it's probably best to look for a different pair.
- Price: The cost of sunglasses is most often a function of fashion. Higher price doesn't mean better UV protection.
- Glare reduction: Polarized lenses can cut the glare that reflects off water or snow -- a feature many people appreciate. But glare reduction doesn't equal UV protection. Check the label for both features.
- Lens color: The color or darkness of the lenses doesn't indicate UV protection. In fact, the coating that blocks UV light is clear.
- Good fit: Wraparound glasses or sunglasses that fit closely around the eyes will block the most UV rays.
Mayo Clinic Women's HealthSource is published monthly to help women enjoy healthier, more productive lives. Revenue from subscriptions is used to support medical research at Mayo Clinic. To subscribe, please call 1-800-876-8633, extension 9751, (toll-free) or visit www.bookstore.mayoclinic.com.
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