Systane Bion Tears Drops is a preservative-free formula that minimizes irritation and provides much needed soothing relief from Dry Eye related to undergoing refractive laser eye surgery or Sjogren’s Syndrome, an autoimmune disease that can affect your salivary glands in your mouth or the lacrimal glands that keep your eyes moist. Each box of Systane Bion Tears contains 24 x 0.4ml single use containers of this lubricant that are easy and very convenient for instilling ‘on-the-go’ whether it’s to work, school, or a social event.