Blue light blocking lenses can effectively block ultraviolet radiation, provide 100% UV400 protection and filter harmful blue light. It is suitable for use when watching TV and watching computers. Note the difference in the days – with these glasses you will notice better screen display and clarity after just a few days of wearing, no more tired eyes – reduce eye strain, eye fatigue and light sensitivity during long computer sessions. Let your eyes flash and work naturally. Great for office workers or anyone who needs to look at an umbrella all day. Designed for all day comfort with a durable yet flexible frame. Whether you're checking emails after a long day of work or burning the midnight oil to complete a project, protect your eyes from excessive blue light. WORKS WITH ALL SCREEN TYPES - The average American now spends more than 7 hours a day looking at a screen. Whether it's laptops, desktops, tablets or smartphones, our glasses reduce harmful blue light that can cause eye problems and prevent optimal sleep. Also effective against light sensitivity. No colour distortion – unlike other glasses, Spectrum lenses do not distort screen colours and have no sharp yellow tint. Our glasses only block the harmful 50% of blue light, while the other harmless 50% are allowed through. So you get an optimal viewing experience without colour distortion.