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Eventually the protective coatings wear down and the lense will become more susceptible to UV and other exposure, though this can take years, even with safety glasses. Micro-fractures can be seen if you look carefully. This is why you should ever clean your eyewear with anything more than warm soapy water and approved anti-fog. Most ballistic lenses will be fully BB resistant for years and years.
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I have developed a new sport called Airhard. Pretty much the same as Airsoft, except you have to maintain an erection...
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