Learn more› By Kaitlyn Wells and Zoe Vanderweide If you believe the hype, blue-light blocking glasses will prevent headaches, decrease eyestrain, and help you sleep like a baby. But do they work?

As the concentration of the dye increased, the muscle cells became more transparent ... absorbs long-wave ultraviolet light (UV-A) and blue light. Red and orange-coloured light can penetrate ...