Clens 100 Lens Drops help prevent the daily build up of protein deposits by creating a protective shield on the surface of the contact lens. When used a few times a day, the lens drops help to maintain the comfort & feel for the wearer, especially useful if you wear your contact lenses for extended periods. Clens 100 lens drops may be used to lubricate & rewet daily & monthly soft contact lenses as well as gas permeable contact lenses.