Fits over all glasses and made in the USA. Turn any glasses into bifocal reading glasses. HydroTac Stick-On Bifocal Lenses adhere with water, are removable and reusable and provide optically correct magnification in any frame. Hydrotac lenses are lightweight, ultra-thin and flexible available at +1. 25, +1. 50, +1. 75, +2. 00, +2. 50 and +3. 00 diopters.