Modern Screen Devices Emit Large Amounts Of Blue Light. Blue Light, Especially The One Between 420-460 Wavelengths, Is A Harmful High-Energy Light Proven By Medical Researchers To Cause Eye Disease. Using Screen Devices For An Extended Period Of Time Can Cause Eyes Fatigue And Chronic Inflammation. Using Anti-Blue Light Filters Can Reduce This Health Problem From Happening.Approved By Sgs, Blocking Out Up To 49% Of Harmful Blue Light, Relieving Computer Eyestrain. (380Nm - 450Nm)