Yes, extended wear contacts are safe. Air Optix Night & Day Aqua feature the highest level of oxygen transmissibility of any soft contact lens available. They allow the eyes to receive ample oxygen even when closed overnight. This reduces the risk of infection, irritation and corneal damage. Continuous wear is not suitable for every user. There are some risks associated with sleeping in lenses that aren't specifically designed for overnight wear. Therefore, it’s necessary to consult an eye care professional to see if extended use is right for you.