Sunglass Care:
It is preferable to clean your sunglasses with a mild soap. However, if you would like to use a specific glass cleaner it is imperative to use one that does not contain ammonia, as this will strip the UV-400 coating right off of the lens. When in doubt, do not use Windex as this contains ammonia, but DO use Glass Plus as it is ammonia free. Dry sunglasses with a soft cloth or chamois and store sunglasses in a protective case to prevent scratches. To maintain proper fit, tighten sunglass frames with an appropriate screwdriver or bring them to an optical store.
UV-400, Impact Resistance, Etc:
All modern sunglasses of quality come with a UV-400 ultraviolet light filter that is a type of coating applied to the lenses by the manufacturer. Basically, they reflect the ultraviolet rays of the sun to save your eyes wear & tear and can be a very important aid in eye-cancer prevention. It is also misunderstood in some circles that the sunglasses in question need to be of a dark tint to afford such protection but this is not the case. Ultravioletlight is invisible to the naked human eye and as such any lens treated with this coating will block the harmful UV rays. Even clear and yellow treated glasses. You can have just as much exposure to ultraviolet light on a cloudy day as you would on a bight sunny excursion. Its there, but you can't see it. So wear some shades and worry not! Also UV-400 (100% protection) is the highest UV protection you can get in a sunglass. More would be redundant. Only welding goggles and other specialty glasses come with a higher rating.
Some glasses on this website have special impact resistant polycarbonate lenses. These lenses are highly durable and will take a hard impact, from lets say a stone, without breaking or shattering. Its not to say that they cannot break, but it would have to be something as strong or stronger that a shotgun blast in which case it probably wouldn't make any difference anyway. A lot of my riding glasses, sport and ski goggles and shooting glasses feature theses lenses. Only A.N.Z.I. industrial lens safety glasses give you more protection.
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