There's relief, and then there's Relieva PF! Refresh Relieva PF is specially formulated not only to relieve discomfort due to dry, irritated eyes, but also prevent further irritation. It features Hydrocell technology, which enables hydration and maintains the volume of cells on the ocular surface. This innovative, preservative-free drop comes in 30 single use vials. Refresh Relieva PF also relieves Lasik dryness. If used for dryness and discomfort associated with Lasik, follow your eye doctors instructions. Trust your eyes to Refresh.