All lenses can be classified into groups based on the materials they’re constructed from and their wear schedule and design as well as their function and the degree to which they have the degree of transparency. Contact lens materials non prescription colored contacts are identified by the materials they are constructed of. They are classified into two main categories – soft and rigid. Rigid lenses can be, later, separated into gas-tight rigid and more recent rigid gas-permeable. All soft lenses can be gas-permeable to some degree and are further classified according to the quantity of water contained in the lens. They may have a low humidity percentage (less than 50%) or excessive moisture level (more than 50 %). prescription colored contacts wearing schedule Contact lenses are also divided according to how often they need to be replaced.A group of lenses is changed as per traditional guidelines. Soft lenses are replaced every year. would be around one year; however, for rigid lenses, it could be many years. Another category will be defined by scheduled replacement. It could be every month or every quarter. Also, there are regular replacement lenses, which can be replaced every day every week, fortnightly, or daily. Additionally, […] read more