Photochromic bifocal reading glasses 2.5 – According to the intensity of ultraviolet light, upgrade smart photochromic glasses will deepen to grey by clear, to protect your eyes. Outdoors are bifocal sunglasses, and indoors are blue light reading glasses; the bifocals are for both near and far reading, so perfect for driving, meeting, traveling, watching TV, shopping, walking, cycling, and so on. Eye protection: HD photochromic bifocal readers 250 with UV400 protection effectively cut blue light from digital screens (computer, phone, pad, TV, LED, etc.) and block glare and UVA/UVB radiation from sunlight. Relieving your eyestrain & headache from long-term screen reading, working, watching a video, gaming, or playing mobile to have a better sleep at night! Comfortable fit: with flexible spring hinge fits well for most faces even large heads or wide faces. Lightweight and big square frame give you a broad vision without turning your neck for all-day comfort. No line bifocals means untouched lines are prettier and easier to clean. Transition photochromic glasses to stop changing between clear bifocal and sunglasses, and make indoor and outdoor reading comfier! Warm tips: May not change very obviously under weak UV situations(NOT FOR LIGHT) like cloudy, rainy days, fall, and winter! The reading area is smaller than a full magnifying lens! Need 1 week to adapt it for the first time wearing! MARE AZZURO photochromic bifocal reading glasses have accurate +1.0 to +3.5 strength for selection, classic style, excellent crafted, great price, fast delivery, and worry-free after-sales! Great value: photochromic bifocal glasses 2.50; A small screwdriver to tighten the screws regularly; A glasses rope to avoid loss and breakage; A soft cloth to keep readers clean; A portable carrying bags to store; A plastic case to avoid scratching; a perfect gift for family and friend! If any problem with size, strength, or broken, please contact the seller to solve it until satisfied.