Turn any eyewear into bifocal reading glasses. HydroTacTM Stick-On Bifocal Lenses adhere with water, are removable and reusable and provide optically correct magnification on any eyewear. Hydrotac lenses are lightweight, ultra-thin pliable lenses available in +1.25, +1.50, +1.75, +2.00, +2.50 and +3.00 diopters. HydroTacTM Stick-On Bifocal Lenses are a smart alternative to expensive prescription readers.