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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 that 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.