OPTASE® Allergy containing Ectoin is a safe, effective, convenient, & ease of use, treatment option for allergic conjunctivitis. Ectoin is a naturally occurring molecule produced by micro-organisms that flourish in harsh & dry environments such as salt lakes & deserts. Ectoin has been shown to be well tolerated & safe, with the ability to increase hydration & stabilize the lipid layer of the tear film as well as reducing inflammation. Preservative free they can be used from 1+ year & are suitable for use with contact lenses. Ingredients: Ectoin (2%), Hydroxyethyl Cellulose, Sodium Chloride, Water, Citrate Buffer Pack contains 20 single dose units with a shelf life of 30 months.