What is Blue Light? Blue light is wavelengths between 380nm to 495nm short and has high energy blue ray, also known as "high-energy visible light" (HEV), Short-wave blue light between 400-450nm is most harmful to the retina, exposure to blue light can cause eye diseases, physiological cycle, cannot to fall asleep at night Exposure to blue light may caused? Vision drop or loss.Eyes fatigue, dry, and other phenomena.Visual fatigue aggravates the lesion of macular region.The night's screen disturbs sleep. The main sources of blue light in daily life PC, cell phone, game machines, TV, etc. Enhanced anti-glare screen protector Anti-glare matte technology can effectively reduce glare and visual fatigue. 100% UV400 Blocking Block ultraviolet rays to ensure the ultimate safety of your eyes Compatible with touchscreen Ultra-clear and ultra-thin, almost invisible, will not affect the function of the touch screen Glass Screen Protector Privacy Screen Protector Laptop Sleeve Bag Mouse Pad Universal Keyboard Cover High Definition Laptop Screen Protector Add to Cart Buying Options Buying Options Buying Options Add to Cart Add to Cart Customer Reviews 4.0 out of 5 stars 809 3.7 out of 5 stars 153 3.9 out of 5 stars 113 4.0 out of 5 stars 17 3.9 out of 5 stars 367 4.1 out of 5 stars 315 Price $13.99$13.99 — no data — no data — no data $4.95$4.95 $8.99$8.99 Compatible 11.6-15.6" Laptop 11.6-17.3" Laptop 11.6-16" Laptop Laptop or Desktop Universal Keyboard Cover 11-17 Screen Protector For 11.6-17.3" Laptop