Lens categories and light transmission: S-157F: cat.2 - average sunlight - 18%-43% and cat.3 - strong sunlight - 8%-18%. Size: - hinge to hinge: 136 mm - vert. dimension: 45 mm - temple length: 125 mm Weight: ca 30g PHOTOCHROMIC LENSES Photochromic lenses darken when exposed to UV light and gradually return to the original state once the light is reduced. They protect the eyes in a wide variety of lighting conditions. In addition, photochromic lenses provide 100% protection from harmful solar radiation SILICONE offers stability over a wide temperature range and is a perfect material to be used in adverse weather conditions. Soft, non-allergenic nose pads and temple ends made of silicone guarantee a pressure-free, non-slip fit and reliable eye protection and significantly improve wearing comfort.
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