Pocket Peepers are a small, credit card sized optical reading lens. Made with a strong acrylic frame that is polymer coated & is nearly impossible to scratch or break. Corrects vision from diopters of +1.25 to +2.50 by moving the lens further away or closer to your eyes for the proper adjustment. Fits easily in your wallet or credit card holder. Great for quick reading of maps, food labels, menus, or any small print!