Helps retain moisture on the contact lens surface so your lenses feel fresh and moist throughout the day. When contact lenses are soaked in Opti-Free Replenish, the surface of the lens is reconditioned every night by adsorbing a proprietary reconditioning system. This allows a thin layer of moisture from your natural tears to be maintained on the lens surface throughout the day. Use of Opti-Free Replenish has been shown to increase comfort for wearers of the most common soft contact-lens material who experience discomfort. Reconditions lenses to maintain surface moisture, allowing many patients to experience clearer vision at the end of the day