The same material used in polycarbonate lenses is found in helmet visors worn by astronauts during space travel and shields carried by riot police. The exceptional protection provided by polycarbonate lenses has made these tough lenses the only choice for children's eyewear. With the active lifestyle enjoyed by many adults today, wearing lenses made of polycarbonate adds a comforting margin of protection for your precious eyes. Polycarbonate lenses are the best investment you can make when ordering new eyewear.
http://www.polycarb.org/poly6.htm
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