Photochromic gray bifocal reading glasses readers the top part of the lens is clear, while the bottom section is available in your choice of magnification for reading your favorite book, newspaper, or work. Photochromic lenses shift from reading glasses indoor to reading sunglasses outdoor, also you can use it as normal photochromic sunglasses,Radiation protection, UV protection. Transition bifocal gradient sunglasses readers reading glasses. Comfortable, lightweight body that won't hurt your nose, always clean and well protected thanks to the free cleaning cloth and case Your glasses will always be clean and well protected thanks to the free cleaning cloth and case! within 30 days, please contact our customer services without hesitation. We will provide the best solutions until the customer is satisfied. You have no risk to try! Bifocal reading glasses: accommodate for both near and far vision by adding a unique lower lens with add vision value for reading and near vision. Transition photochromic gray bifocal reading glasses lens optical glass containing silver halide microcrystals, Phototropy reversible reaction according to the principle, In the sunlight and UV irradiation variable dark, Completely absorb ultraviolet and visible light absorption of neutral，Back to the dark, Can restore the colorless transparent.