YOU CAN ENJOY THE AFTER-SALES SERVICE - We can fully understand that it is difficult to find a pair of suitable anti-blue glasses. If you have any dissatisfaction with our products, please do not hesitate to contact us. We will do our best to serve you! You have no risk to try!. BETTER SLEEP - Durable exposure to blue light will slowing or stopping the production of melatonin, causing sleep disorders. AHT Blue Light Blocking Glasses can stop it and provide you with a better night's sleep. MOST VINTAGE RETRO ROUND FRAME DESIGN - Round shape design blue light blocking eyeglasses, with a modern feel, a Round shaped frame complementary to narrow, oval and oblong faces, is a good fit for almost all face shapes. Tortoise frame and elegant fashion thin metal arms that sits beautifully and comfortably. EXCLUSIVE PATENT TAC LENS - High Transmittance, Low Color Aberration. Exclusive patent layers lamination technique with slight tinted lenses, cuts High-Energy Blue Light to minimize Digital Eye Strain. TAC lens can not only block harmful blue ray, 99.9% UVA & UVB Protection, also with 93% high transmittance, providing a prefect BLANCE between eye protection and visual experience. REDUCE EYESTRAIN - Harmful Blue Light that screens emit would cause headaches, dry eyes, eyes fatigue and blurred vision. Blue light blocking glasses refract the blue ray with the Germany ultrathin TAC lenses, minimize the digital eye strain we suffer from digital product screens. Cellulose Triacetate lens. Metal frame.