Air Optix Aqua by Ciba Vision has a recommended replacement schedule of up to 4 weeks. Air Optix Aqua are breathable contact lenses, which deliver an advanced combination of oxygen and moisture for a healthy, natural feeling. Air Optix Aqua lenses also offer excellent initial as well as all-day comfort. Air Optix Aqua are made with patented lens material that helps maintain moisture by minimizing the rate of lens dehydration for comfort all day, ultra-smooth surface with superior wettability and excellent deposit resistance for comfort every day. Air Optix Aqua lenses are recommended for daily wear or up to six nights of extended wear, as determined by your eye care professional for the optical correction of vision in persons with healthy eyes. Air Optix Aqua lenses are tinted for ease of handling and will not change the color of your eye. The tint is simply designed to facilitate locating the contact lenses in solution.