Not only a preservative free lubricating eye drop but also a long-lasting and robust formula. Can be used for 6 months after first opening and can be stored at room temperature. Do you wear contact lenses? Not a problem as Hycosan Dual dry eye drops can be used by contact lens wearers. Contains Ectoin to help stabilise the tear film. Ideally suited to those with diagnosed Meibomian Gland Dysfunction or Lipid deficient dry eye. A stabilised tear film with a healthy oil layer offers protection from allergens and tear evaporation. Hycosan Dual contains a naturally occurring substance called Sodium Hyaluronate which replenishes the tear film and Ectoin which helps stabilise the tear film.