"Blue light filtration typically refers to a coating, which can be applied to corrective prescription lenses or plain lenses," Dr. Jen Tsai, an optometrist in New York City and founder of Line of ...

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?