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The color in the visible light spectrum ranges from blue to red. Blue light sits on the very edge of the spectrum, close to invisible UV light. Blue light is considered "high-energy visible light" (HEV), hits our eyes at a higher frequency than we're exposed to on a daily basis. As we spend more time staring at monitors, iPads, and smartphones, we increase the amount of blue light we're exposed to — and that's where blue light filtering glasses might help. The glasses have filtering materials or surface coatings on the lenses that block a portion of blue light, made of Polycarbonate, a very popular, impact-resistant lens. It is made from high-tech plastics, makes screen time more comfortable, and helps significantly reduce symptoms of digital eye strain. -Protection for Your Eyes: reflect and filter blue light, prevent color distortion, 7-layer anti-reflective coating to reflect and filter blue light, reduce eyestrain and sleep better. High light transmittance with no noticeable yellow tint to prevent color distortion, minimize glare from digital screens. -Reduce Eyestrain: Enjoy your digital time, no worry about eye fatigue, blurred vision, and headache. -Anti Blue Light: Reflect and filter 85% of harmful blue light, prevent color distortion, 7-layer anti-reflective coating to reflect and filter blue light, reduce eyestrain and sleep better. -Excellent Tr90 Material: Ultra-lightweight and flexible Tr90 nylon frame material for durability and comfortable long-term wear., Lens Resin. Casual frame design keeps you looking professional and stylish while working or playing video games.