PureVision™ contact lenses with innovative optics deliver pure, rich contrast and highly refined detail. PureVision contacts are made from our unique material that’s exceptionally healthy, so your eyes can feel as comfortable as you ever imagined, all day long and well into the night. PureVision contact lenses have an enhanced optical design to correct spherical aberration, a natural occurrence in which light rays are refracted at different angles as they pass through the eye. Left uncorrected, spherical aberration can result in less than optimal visual quality. PureVision contact lenses are marketed as a contact lens that can be worn safely 24 hours a day for up to 30 nights and days.