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Smart sunglasses change tint with the click of a button and can even take phone calls | Daily Mail Online
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You can control the tint on these smart-sunglasses using a slider on a smartphone app - Yanko Design
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3 Tips for choosing Photochromic Lenses | Transitions / Reactolite / Sensity / Photofusion - YouTube
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Walmart Ashland City - ZEISS Velocity self-tinting lenses quickly adapt to changing light conditions, providing clear vision indoors and protection against harmful UV light when out. Available in Extra Gray, Gray, Brown,
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