<br>All of our electronic devices give off excessive quantities of blue light (smart phones, tablets, laptops and desktop computers). This blue light messes with your <br>internal clock and stops your body from naturally producing melatonin, the hormone that helps us fall asleep late at night. <br> <br>K KENZHOU glasses block the most harmful types of blue light helping our body keep its natural schedule. The lens with a slightly yellow can better protect your eyes and prevent fatigue.This allows you to have an optimal viewing <br>experience without the nasty yellow glare that can occur with inferior glasses. <br> <br>The lens was made of a fully transparent base, while maintaining high light transmittance. Less reflective, no affect reading, and giving you get the optimal <br>viewing experience without any color distortion. <br> <br>K KENZHOU glasses are essential for anyone using an electronic device daily. Each lens comes with layer coating designed specifically to reduce glare, <br>reflect blue light away from the user and relieve long term eye strain caused by excess electronic device use.If you are using your phone or computer late at night <br>and have trouble sleeping you would notice a difference almost immediately when you first try K KENZHOU computer glasses.Just Anti-blue glasses,Not anti-blue reading glasses.only minimal yellow tinting,Just a pain free screen experience that lasts all day! <br> <br>Please note: The cleaning cloth of blue light blocking glasses will have a little fade.