Protection for Your Eyes : Anti Blue Light Glasses- the lens has UV400 protection, which can block 99.99% of the blue light. Protect your eyes from blue light when working for a long time or when surfing the Internet. Prevent headaches caused by blue light damage. Protect the quality of sleep. High-Quality Materials： The Blue light glasses frame material is made of TR90 . It has the advantages of firmness, portability. It can be suitable for various use environments. The frame also has a solid metal hinge, which can be opened and closed smoothly and sturdy. Comfortable long-term wearing.