REDUCE DIGITAL EYE STRAIN - Enjoy your digital time, NO worry about eye fatigue, blurred vision and headache. | ANTI BLUE LIGHT - Cut 90% of the blue light. Relieving eye fatigue, dry and vision falling. | BETTER SLEEP - Reduce eye strain and headache, so you can enjoy a restful deeper sleep | MATERIAL - Frame: TR90 ; Lens: Polycarbonate (Non-Prescription, no vision correction) | LIFETIME WARRANTY--We provide worry free lifetime warranty and friendly customer service.