Air Optix Aqua contact lenses from Ciba Vision are made with a new hydrogel material that allows up to 5 times more oxygen to flow through the lens than regular contact lenses. This means that Air Optix Aqua provides a comfortable contact lens with great visual acuity for up to 7 days straight without removal. The contact lenses stay comfortable and wet due to the AQUA moisture system which helps reduce the rate of lens dehydration. Air Optix Aqua are a monthly replacement contact lens but frequency of replacement depends on usage. Please consult with your eye doctor for the wearing schedule that is best suited for your vision needs. There are 6 lenses in each box of Air Optix Aqua.