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Elklook Eyewear 97% Off Coupon Code and Promo Code with Free Shipping. UV protection has become common sense, but many people ignore the hazard of blue light to the eyes. According to scientific research, blue light with a wavelength between 400-460nm can cause vision loss, macular degeneration, and cataracts. Most importantly, this damage is irreversible. Blue light commonly exists in computer monitors, mobile phones, LEDs, etc.