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Photochromic Progressive Multifocus Transition Reading Glasses Blue Light Blocking Multifocal Computer Sun Readers Eyeglasses Anti Glare Eye Strain Lightweight UV400 Sunglasses Eyewear for Men Women : Amazon.co.uk: Health & Personal Care
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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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Men's Photochromic Polarized Sunglasses for Driving, Rectangular Frame with 100% UV Protection (Black(sports)/Discolor)(Size:M) : Amazon.co.uk: Fashion
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