Air Optix Aqua and Air Optix Night & Day Aqua are comparable in quality and performance. However, Air Optix Night and Day are approved for up to 30 nights' continuous wear. Classic Air Optix Aqua can be worn continuously for up to six nights and seven days. Both feature a high-performance aspherical design, breathable silicone hydrogel material and advanced comfort technologies. Your ophthalmologist can help you choose the best option for you.