You can control the tint on these smart-sunglasses using a slider on a smartphone app - Yanko Design
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UV, Sun Tints & Photochromics - Torga Optical - Optometrists, Spectacle Spectacle Deals, Fashion Eyewear and German Precision Lens Technology. Solutions for your visual day!
Smart sunglasses change tint with the click of a button and can even take phone calls | Daily Mail Online