What You Get From Roshfort Blue Light blocking glasses? -Blue ray blocking -- with American HEV-Adsorb substrate absorption technology, Roshfort lenses can absorb 95% of high-energy blue light. -UV 400 protection -- Anti-Blu-ray Lenses utilize special U.S. substrate processing technology to protect the eyes from ultraviolet rays. -Clear lens -- The lens was made of a fully transparent base, without any pigment, while maintaining high light transmittance. Less reflective,no affect reading, and almost no color differenc Protect your eyes from harmful blue light by electronic devices (such as computer, TV, smartphones) BLUE LIGHT BLOCKER & REPLACEABLE LENSES – Reduce symptoms of eyestrain during prolonged computer exposure. These glasses are best used for long hours of computer use to maintain natural sleep patterns and eye protection. The original lenses can be replaced with your prescription lenses at any store. Our glasses block 95% of blue light effectively when you face to the digital screen and you will get the most-refreshing sleep.