ACUVUE OASYS Bifocal Medium Add lenses are made for you to see more clearly at all distances. ACUVUE OASYS Bifocal Lenses feature Hydraclear® Plus technology to keep your eyes moisturized and comfortable enough to wear all day long. Lenses should be thrown away and replaced monthly to keep your eyes healthy and in optimal shape. Manufactured by Vistakon. Available in a pack of 6.