ELEGANTE Blue Light Blocking Blue Cut Zero Power anti-glare Rectangular Eyeglasses, Tony Stark Frame for Eye Protection from UV by Computer/Tablet/Laptop/Mobile (With Torch and Testing Card)

Description

Blue Light Blocking Blue Cut Zero Power anti-glare rectangular glasses, Tony Stark Frame Shape for Eye Protection from UV by Computer/Tablet/Laptop/Mobile (With Torch and Testing Card). Testing card can be used repeatedly, irradiated test card will resume after 1-2 minutes. How to test if your glasses have capacity to block blue lights from screen of your laptop/mobile? 1) First of all switch on your torch on white space on card, effected area will get purple spots. 2) Then After purple spots get irradiated, then now put your glasses on card while space and place torch light on surface of lens, then check now your testing card will no get purple spots.