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Polycarbonate: Polycarbonate is lightweight| comfortable| impact resistant| and provides UV protection. Polycarbonate: Polycarbonate is lightweight| comfortable| impact resistant| and provides UV protection. SINTEC® lenses eliminate reflections from flat surfaces| ensuring greater visibility and comfort. This comfortable polarized lens cuts blinding glare while filtering blue light to increase contrast and improve depth perception in a wide variety of weather/light conditions. It also has a softening effect on the eye| reducing eye strain.