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Specifications ·Type: Blue Light Blocking Glasses ·Frame Color: Hawksbill turtle Blue ·Len’s Color: Nearly Clear ·Material:PC/frame Resin/lens ·Lens width: 51mm ·Lens height: 44mm ·Frame width: 136mm ·Leg’s Length:140mm ·Bridge (DBL):19mm ·Package: 1 Pair of Glasses ＊Why use anti-blue lenses? The main source of blue light is the LED backlight used in the LCD screen. The products with harmful blue light in our daily life are mainly mobile phones, computers, tablet computers, TVs, game consoles, etc. *Our lives are completely surrounded by screen, and on average we spend nearly 9~12 hours a day in front of digital devices.Blue light is extremely harmful to our health and can cause eye fatigue, headaches, bad sleeping and even more serious diseases.The anti-blue light lens has multi-layer coating, which can block harmful blue light, protect our eyes and bring us a healthier life.