Bausch & Lomb ULTRA® contact lenses are manufactured with a special formulation of 3 silicone molecules combined with a high polyvinylpyrrolidone (PVP) content that allows for superior water retention within the polymer. The lenses are produced using the proprietary MoistureSeal™ technology. ULTRA® lenses are highly oxygen transmissible, extremely comfortable, and resistant to dehydration even at the end-of-day wear. These lenses are designed to be worn as monthly wear lenses. This means that you must take the lenses out each night and reuse after disinfection for up to 30 days after which you can simply discard and replace with fresh lenses.