Lens width: 49 millimeters Bridge: 24 millimeters SIZE RANGE: All glasses have adjustable temples that can be fully closed or extended to fit a range of sizes. NEVER MISPLACE YOUR GLASSES AGAIN. With exclusive front magnet connection and permanent rigid headband, taking them on and off is quick and easy. Adjust the temples for a perfect fit while wearing your glasses or have them comfortably lay around your neck when not in use. Never lose your glasses again with this built in convenience. ADJUSTABLE TEMPLES FOR A PERSONALIZED FIT. The adjustable temple feature found on all frames allow for easy sizing in the moment. Simply pull to adjust the length of your glasses for a perfect fit every time you put them on. DURABLE LENS & BAND. Your blue light blocking readers are manufactured with high-impact acrylic lenses, strong neodymium magnets, and a durable TR90 wrap-around rigid headband strap. Along with our unique 180 degree hinges that allow each lens to fold upward towards the frame or straight down around the neck.