O2 Optix contact lenses from CIBA Vision provide the highest level of oxygen transmission. These contacts are so breathable that you can sleep in them for up to 6 nights of extended wear. Your  eyecare professional is best suited to outline a wearing schedule best suited for you.  O2 Optix contacts transmits many times more oxygen than standard soft contact lens leaving your eyes feeling and looking healthy every day.  Its the closest thing to wearing no contact lenses at all.  Each box contains six O2 Optix contact lenses.  The CIBA family of contact lenses has long beeen regarded an an industry leader in the field of contact lenses.  Why not wear a name brand contact lens at a fraction of retail cost?