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Frame Material: TR90 frame. Lens Material: Resin lens. Lens width: 2.01 inches. Lens height: 1.65 inches. Bridge: 0.71 inches. Arm: 5.63 inches. Frame Height: 1.77 inches. Frame Width: 5.39 inches. Magnification Strength(Diopters): 1.5, 2.0, 2.5. We use super-elastic TR90 material to produce the frames, lightweight and comfortable. The most important features of the the CARA reading glasses with TR90 optical frame are that they are comfortable and perfectly safe to wear. Photochromic Bifocal Reading Glasses Darkens the lens to grey based on sunlight. Photochromic lenses shift from blue light blocking reading glasses indoor to reading sunglasses outdoor, also you can use it as normal photochromic sunglasses, UV400 protection. Wearing our photochromic bifocal reader , you can read, play with mobile phones and laptop freely outdoors. And suit for driving, fishing, traveling.