Safeopedia Explains Polycarbonate Lens
Polycarbonate was discovered in 1953 and was first introduced to the market in 1958. It was used by the astronauts in 1970s as helmet visors. In the 1980s industries started to use polycarbonate as an alternative to standard plastic or glass eyewear. Polycarbonate lenses are a smart choice for those active in sports, hazardous job environments, in fashion eyewear and especially for children.
Normal plastic lenses utilize a cast molding process, while polycarbonate pellets are heated to a melting point and injected into lens molds. It makes polycarbonate lenses stronger and more impact-resistant. However, these lenses are not scratch resistant and, therefore, require a special coating.
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