ATTCL BLUE LIGHT BLOCKING LENS can effectively block ultraviolet radiation ,provide 100% UV400 protection and filter harmful blue light,it is suitable for use when watching TV and look at computer. NOTICE THE DIFFERENCE IN DAYS - With these glasses, youâ€ll start to notice better screen viewing and greater clarity after just a few days of wearing them NO MORE TIRED EYES - Reduce eye strain, eye fatigue and sensitivity to light during long computer sessions. Allow your eyes to blink and function naturally. Great for office workers or anyone who has to look at a screen all day. Designed for all day comfort with a durable yet flexible frame. Whether youâ€re catching up on emails after a long day at work, or burning the midnight oil to finish a project - protect your eyes from excessive levels of blue light WORKS WITH ALL SCREEN TYPES - The average American now spends over 7 hours a day looking at a screen. Whether itâ€s laptops, desktops, tablets or smartphones - our glasses help reduce harmful blue light that can causes eye issues and prevent ideal levels of sleep. Also effective against sensitivity to fluorescent lights NO COLOR DISTORTION - Unlike other glasses, Spectrum lenses donâ€t distort screen colors or have a harsh yellow tint. Our glasses only block the harmful 50% of blue light, while letting the other, harmless 50% through, giving you get the optimal viewing experience without any color distortion