Preservative free formula relieves discomfort due to dry, irritated eyes Prevents further irritation Hydrocell technology enables hydration and maintains the volume of cells on the ocular surface Recommended for sensitive eyes Can be used after LASIK or other eye surgeries. Follow your eye doctor's instructions. On-the-go single use vials Also available in a preservative-free formula that comes in a multidose bottle. The in preservative-free artificial tears.IRI Artificial tears preservative-free.