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Ousudela devotes to create professional and fashion blue light blocking glasses Why people need to filter blue light? -blue light in daily life is more likely to be the harmful blue light generates by smart screens. From TV to Pad, from PC to smartphone, people are continually exposure to unnatural blue light. -the harmful blue light may cause headache, insomnia, eyestrain, or even retina injury. Why choose ousudela blue light blocking glasses? -ousudela blue light blocking glasses adopted latest technology to guarantee clearer vision and 100% original colours. Also with UV400 to protect you from ultraviolet ray. -difference from other PC/GAME glasses: we used ABS materials in our frames, exquisite skills and stable materials, more durable. -ergonomic design: when watching TV, surfing internet or playing video games, the glasses would not slip, stay stable. -pay same amount money as other glass, you can receive four better quality blue light blocking glasses at ousudela. Maintenance: Cleaning the lens with water or professional clean solution and wipe the lens with the clean cloth we offer in the package frequently. When wiping the lens, do not try too hard. Please do not clean the lens with other chemicals to avoid damage to the lens. Especially custom made for Americans Lens width:53mm(2.1in) Lens height:43mm(1.7in) Bridge of nose frame:17mm(0.7in) Frame width:142 mm(5.6in) Temple length:140 mm(5.5in) Package list: 4* blue light blocking glasses 1* blue light emitter 1* test card 1* professional clean cloth 1* mini screwdriver Harmful blue light is everywhere, please let us protect your eyes!