These TFL Anti-Blue Glasses are designed to absorb high-energy blue light. It is an anti-harmful blue ray that provides all-day protection against the detrimental effect of high energy visible blue light. It also helps people who use their devices before bed having a hard time falling asleep and staying asleep. These Anti-Blue Glasses work by blocking the blue light rays you are exposed to from your devices and you can still enjoy your device from the comfort of your bed and get a restful deeper sleep. It is a great use for watching TV or use the computer for long periods. Enjoy your digital time, no worry about eye fatigue, blurred vision, and headache.