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