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Reading Glasses Information Frame Material: TR90 frame. Lens Material: Polycarbonate lens. Lens width: 1.97 inches. Lens height: 1.38 inches. Bridge: 0.67 inches. Arm: 5.51 inches. Frame Height: 1.57 inches. Frame Width: 5.39 inches. 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. Non-slip parts at the temples prevent the glasses from slipping off. Bifocal Reading Glasses Bifocal lenses have two zones. The top part of the lens helps you see things in the distance, while an area in the bottom half of the lens is designed for reading. This lower portion of the bifocal lens reduces the effort it will take for your eyes to focus on smartphone, menus and other nearby objects. Without having to keep taking them off and putting them back on. Suitable for driving and outdoor. Bifocal Reading Sunglasses Reader Magnification and Sunglasses in One, No More Carrying Multiple Pairs of Glasses. The top part of the lens helps you see things in the distance, while an area in the bottom half of the lens is designed for reading. Perfect for Outdoor Reading and Distance Viewing. Wearing our bifocal reading sunglasses, you can read, play with mobile phones and laptop freely outdoors. Suit for driving, fishing, vacation, happy hour, summer party.