are designed to protect our eyes from the harmful effects of the sun. Labels on sunglasses usually protect against ultraviolet and other types of natural radiation. It is important to know what kind of light is needed to protect the eyes, and what type of light is not necessarily harmful. Recommended reading: Outdoor sunglasses brand classic models block 99% of ultraviolet rays. You should always buy sunglasses with this feature. Long-term exposure to ultraviolet (UV) radiation in the sun is associated with cataracts and eye growth, including cancer. Compared with UVA radiation, UVB radiation is considered to be more dangerous to the eyes and skin. Both plastic and glass lenses absorb some UV rays, but the absorption of UV rays can be improved by adding chemicals to the lens material or using special lens coatings during the manufacturing process. Look for sunglasses that block 99% or 100% UV rays. Some manufacturers’ labels say “ultraviolet absorption up to 400 nanometers”. This is the same as 100% UV absorption. Ground and polishing Some over-the-counter glasses are ground and polished to improve the quality of the lenses. Non-ground and polished non-prescription lenses will not harm your eyes. Impact resistance All sunglasses must meet the impact standards set by the Federal Food and Drug Administration (FDA) for safety reasons. No lens is truly unbreakable, but plastic lenses are less likely to break when hit by a ball or stone than glass lenses. Most over-the-counter sunglasses lenses are plastic. Polycarbonate plastic sunglasses, used in many sports, are particularly tough, but they are easily scratched. If you buy polycarbonate lenses, look for lenses with scratch-resistant coatings. Polarized polarized lenses cut out reflected glare-sunlight reflects off smooth surfaces, such as roads, car windows, chrome-plated surfaces or water. They are particularly useful for driving and fishing. Polarization has nothing to do with UV absorption, but many polarized lenses are now combined with UV blocking substances. Check the label to ensure that the lens provides maximum UV protection. The lens is dark and medium lenses are suitable for daily wear, but if you are using glasses in very bright conditions, choose darker lenses. The color and darkness do not tell you the ability of the lens to block ultraviolet rays. The lens of photochromic photochromic glasses automatically darkens under strong light and brightens under weak light. Most of the dimming occurs in about half a minute, while lightning takes about five minutes. The photochromic lens has a uniform or gradient tone. Although photochromic lenses may be good UV-absorbing sunglasses (again, the label must state this benefit), they need time to adapt to different light conditions.
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