Hycosan Extra includes a natural tear lubricant (0.2% Sodium Hyaluronate) and provides relief for severe eye irritation, it is a highly viscous solution, with little or no blurring of vision. Hycosan Extra offers patients a preservative free drop which ensures contact lens compatibility, and is delivered via the patented COMOD system. This unique device dispenses a single calibrated drop with each click, and as such, it offers incredible value for money when compared to more traditional Preservative Free options. Can be used for 6 months from first opening.