Hyfresh Ophthalmic Solution contains a highly purified specific fraction of sodium hyaluronate. Sodium hyaluronate is a natural polymer, which is also present in the structures of the human eye. Its main physical characteristic is viscoelasticity. This means that Hyfresh has a high viscosity between blinks and low viscosity during blinking ensuring efficient coating of the surface of the eye. Sodium hyaluronate also possesses mucoadhesive properties and the ability to entrap water, thus resembling tear mucus glycoprotein. This, together with the coating properties of sodium hyaluronate results in an increased pre-corneal residence and tear film break-up time and therefore longer lubrication of the corneal surface.