The ThinOptics Secure Fit Armless Ultralight Reading Glasses come with a convenient keychain case to take with you wherever you go. A marvel of modern engineering, the durable keychain case masterfully holds and protects your readers until you need them. And when you do, clear vision is just a slide of the finger away! Choose from a variety of lens strengths and frame colors to fit your exact needs and style preference. Attach the glasses to your keys for "always with you" convenience or fasten to a backpack, golf bag or luggage for easy access anywhere! These glasses are the thinnest, lightest and most durable reading glasses in the world. They feature optical-grade polycarbonate lenses, an ultra-flexible titanium alloy bridge and Flex-Fit Technology that delivers a universally comfortable yet stable grip on any nose. Low Range +1.00 fits +0.75 to +1.25. Low-Mid Range +1.50 fits +1.25 to +1.75. Mid Range +2.00 fits +1.75 to +2.25. High Range +2.50 fits +2.25 to +2.75.