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Polycarbonate is a material that is ten times more impact resistant than conventional plastic or glass lenses. While impact resistant does not mean shatterproof, polycarbonate lenses offer the extra level of protection recommended for children, teenagers, or active participants in sports-as well as people who work in certain occupations. In addition to its impact-resistant qualities, polycarbonate is thinner and lighter than conventional plastic or glass lenses-and it comes with built-in protection from the sun's harmful ultraviolet rays.