Vision Council Promotes 100% UV Protection on June 27 National Sunglasses Day

Q: Your dark sunglasses could be a trojan horse for UV rays. How can you be certain your eyewear is actually protecting you?

To be sure your sunglasses are protecting you, check for a clear label stating “100% UVA and UVB protection,” “100% UV protection,” or “UV400.” Those markings indicate the lenses block harmful ultraviolet rays up to 400 nanometers. If there is no such label, experts say do not assume the glasses are safe, no matter how dark, expensive, or stylish they are. Dark lenses alone are not protection. In fact, they can be worse than no sunglasses if they lack UV filtering, because the tint makes your pupils open wider and can let in more damaging radiation. Polarized lenses also do not guarantee UV safety; polarization reduces glare from water, snow, and roads, but UV blocking must be verified separately on the label. If you already own a pair and are unsure, an optical shop or eye doctor can usually test the lenses with a UV meter. That is the most reliable way to confirm older sunglasses are still doing the job. Buyers can also look for compliance with recognized standards such as UV400, ANSI, or EN ISO labeling, though the plain-language UV claim remains the key check. Coverage matters too. Wraparound or larger frames help block rays entering from the sides, and a wide-brimmed hat adds protection. Experts recommend wearing UV-blocking sunglasses year-round, even on cloudy days, because a large share of UV radiation still penetrates cloud cover.

Q: Experts warn most of your lifetime eye damage from the sun happens before age 18. What makes children's vision so vulnerable?

Children’s eyes are more vulnerable because they let in more ultraviolet light than adult eyes, while the damage from that exposure builds up over time. Experts say a child’s lens is clearer and more transparent, so it filters less UV radiation before it reaches the retina. Children also tend to have larger pupils, which allows more light, including harmful UVA and UVB rays, to enter the eye. Because their eyes are still developing, that extra exposure can have a greater long-term effect. The risk is compounded by behavior and timing. Children and teenagers often spend more time outdoors, especially during peak daylight hours, and may be less likely to wear protective eyewear consistently. Since UV damage is cumulative, heavy exposure early in life can raise the risk of later problems such as cataracts, macular degeneration, photokeratitis and other UV-related eye damage. That is why eye specialists stress daily protection, not just on bright summer days. UV rays can penetrate clouds, and reflected light from water, sand and snow can intensify exposure. The standard advice is sunglasses labeled 100% UVA/UVB protection or UV400, ideally in wraparound styles, along with a wide-brimmed hat. For children, many doctors recommend impact-resistant polycarbonate lenses. The broader message behind National Sunglasses Day is that sunglasses are a health tool. For children especially, early protection can reduce lifetime sun damage and help preserve vision into adulthood.

2 articles · Updated · bctv.org · Jun 25

June 27 marks National Sunglasses Day, with The Vision Council using the annual campaign to stress that sunglasses are a daily eye-health necessity, not just a summer fashion item.
100% UVA and UVB protection is the key message because prolonged sun exposure can contribute to cataracts and other UV-related eye damage, even on cloudy days.
People across the U.S. are encouraged to wear their favorite shades and post photos with #NationalSunglassesDay to spread the eye-safety message more widely.
The campaign aims to turn that awareness into routine behavior, framing regular sunglass use outdoors as a simple step to protect long-term vision.