【Why Do We Need to Anti Blue Light】The average people now spends over 7 hours a day looking at a screen. Whether it's laptops, desktops, tablets or smart phones. High Energy Blue Light emitted by electronic devices have shown to increase the risk of vision conditions from sore dry eyes to macular degeneration. Extended exposure to blue light rays may cause fatigue and stress. Maintain healthy eyes by reducing exposure to high energy blue light. 【Block 90% Blue Light】UBUJI Blue Light Shield protects your eyes by filtering out 90% of the most harmful High Energy Blue Light (400nm - 430nm) rays while letting through the less harmful portion of the blue light spectrum. Filter 100% of hazardous ultraviolet ray, including UVA/UVB. 【Reduce Eyestrain and Enjoy Better Sleep】No more eye fatigue, blurred vision and headache during your computer, tablet, phone screen time. Filtering out the High Energy Blue Light allows you to focus on your game or task at hand. Also make a better sleep for you, blue light blocker is there for your eyes and guardian for your exquisite life.