Zero 4 (Am Hydron) is a conventional lens, which means it can be worn daily with regular cleaning for up to one year before replacement.
These lenses are designed with increased levels of water which allows your eyes to stay moist and hydrated all day. This also prevents them from being scratchy and dry at the end of the day. The Zero 4 contact lenses also need to be enzymed weekly to keep their comfort and clarity. Contact your optician for an exact replacement schedule.