Fuisetaea Photochromism Gray Bifocal Reading Glasses Lightweight TR90 Frame Transition Readers Eyeglasses

Fuisetaea Photochromism Gray Bifocal Reading Glasses Lightweight TR90 Frame Transition Readers Eyeglasses

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. Lightweight TR90 Frame UV400 protection and anti radiation. Dimensions: Frame 13.7cm (5.4in) wide, arms 14.1cm (5.5in), lenses 5.1x4.3cm(2.0x1.7in)，Bridge1.8cm(0.7in). 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.