Lens width: 59 millimetersLens height: 42 millimetersBridge: 18 millimetersArm: 142 millimetersFunction: filter blue light and photochromic,7-layer anti-reflective coating to reflect and filter blue light,PHOTOCHROMIC GLASSES: Cut UV 400 (ultraviolet ray), reduce eyestrain and sleep better.High light transmittance with no noticeable yellow tint to prevent color distortion, minimize glare from digital screens.BLUELIGHT BLOCKER & REPLACEABLE LENS: Reduce symptoms of eyestrain during prolonged computer exposure. These frames are best used as indoor lenses for long hours of computer use in order to maintain natural sleep patterns and eye production. The original non prescription lenses can be replaced with progressive lenses at any stores.COMFORTABLE WEARING:Lightweight and durable.These glasses fits well both for small faces and big heads with adjustable nose guards.You can wear our glasses for long periods of time in front of digital screens or for your upcoming trip out of town.SUITABLE OCCASION: These Glasses are perfect for daily, office, reading, computer games, etc. Bring you visual experience and a fashionable and healthy lifestyle