Reading Glasses Size Lens width: 53 mm/2.1 inches. Lens height: 43 mm/1.7 inches. Nose bridge width: 18 mm/0.7 inches. Total frame width: 139 mm/5.5 inches. Rod length: 143 mm/5.6 inches. Product Type: Photochromic Reading Glasses Lens Function: Clear Vision Frame material: TR Lens Material: AC Recommended people: men, women Package: reading glasses*1, glasses case*1, glasses cloth*1 Diopters: 1.0x, 1.50x, 2.00x, 2.50x, 3.00x, 3.50x Bifocal lenses allow bifocal vision, with normal sunglasses at the top to help you see far; A good size magnifying glass in the inner bottom corner to help you read and work by magnifying small fonts, perfect for outdoor reading and long distance observation Photochromic lenses for indoor/outdoor darkens automatically when exposed to UV rays and are UV400 protected. Indoors or at night, the lenses return to colourless and transparent within minutes. These glasses are perfect both at home and outdoors and perfect for poolside reading and watching kids UV400 eye protection effectively blocks mirrors or any other form of sunlight reflection, giving you a natural and clear vision; The lenses are durable, scratch resistant and shatterproof; giving you good comfort when reading, driving, working or other outdoor activities Visual experience is the best choice for protecting your eyes and maintaining eye health while reading Notice 1. The size of the glasses is measured by hand only. There may be 1-3mm error. This does not affect daily use. please understand 2. To avoid damage, do not use wipes