A review of hyaluronan and its ophthalmic applications.

Hyaluronan (HA) is a naturally occurring, biocompatible polysaccharide with unique viscoelastic and hygroscopic properties. Its role as a natural lubricant and its excellent water-retaining properties make it well-suited for use in ophthalmic products. Many reports have been written describing the various uses of HA. The purpose of this report is to review the uses of HA in the anterior segment of the eye, more specifically, its use in the treatment of dry eye syndrome, and in contact lenses and contact lens care systems.