Sunglasses protect our eyes from harmful UV radiation, blue light, and glare. Sunglasses are essential for walking outdoors, driving, sports activities, lounging at the beach, and more! To ensure maximum protection, before purchasing a new pair of sunglasses, look for the following key elements: 100% UVA and UVB protection. The dangers of UV light have prompted scientists to search for versatile materials that can block it and withstand long radiation exposure times without falling apart. Now a group of researchers in China has developed a new method to create transparent, glass-based materials with UV-absorbing power and long lifetimes. Wikipedia says that glass blocks ninety percent of light below 300nm. @AlecS even if it is only 10% the hours of driving and the latitude would play a large role. One hour radiation in the equator is ten hours or so close to the poles. And infrared cooks the skin after all, and that passes the glass. The light bouncing off your lenses shows which colors are being blocked. Hold your lenses up to a light source and check the colors reflecting off of them. If you see the color blue, you know your glasses are blocking at least some blue light. [1] This test works for clear daytime lenses and computer glasses. The recommended amount of sunscreen is two tablespoons, or the equivalent of a shot glass. Don’t forget the tops of your ears and the back of your neck, areas that Dr. Goldberg says are often missed and are exposed to UV rays. If you’re using a spray sunscreen, Dr. Jaliman says it’s important to rub it in thoroughly. A lot of people have asked, “Does glass or plastic block 100% of UVC radiance?” It’s true that UVC is the most dangerous type of ultraviolet radiation because it contains the highest energy. However, the earth’s atmosphere absorbs most of it, so the majority of UVC is not a risk to humans. It is the other type of UV radiation that is Tinted windows don't block all UV rays. If you have windows that claim to block UV rays, it is important to point out that a very tiny amount of UV still gets through. As I mentioned above, it's possible to block 99.9% of UV rays, but even if their windows are that good, the 0.1% can add up at 8 hours a day, 5 days a week. Regular glass does not block UV radiation but window inserts are an easy way to block 98% of the harmful rays from the sun. Get Estimate Save up to $1,200 on thermal window inserts. npdfrJx.