The double-action formula (lubrication & osmoprotection) means that Optive Fusion eye drops hydrate and lubricate the surface of the eye and also penetrate deep below its surface, where they protect the eyes from hypertonic stress thanks to osmoprotection (repeatedly hydration of the eye epithelium). They contain the combination of HA (hyaluronic acid) and CMC (carboxymethyl cellulose), two polymers that reduce the symptoms of dry eye syndrome, including burning and itching. They also contain the preservative PURITE which breaks down into natural tear components.