GenTeal Lubricant Eye Drops and GenTeal Gel, (0.3% hypromellose, Novartis Ophthalmics, Basel, Switzerland) provide a natural alternative to preservative-free treatments, with a sodium perborate preservative system and long-lasting action due to the carbomer gelling agent. The perborate preservative, which breaks down to water and oxygen on the ocular surface, essentially delivers a preservative-free lubricant to the eye. This makes the GenTeal products attractive agents for use in the LASIK perioperative period.