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What is Hycosan Extra Hycosan Extra contains 0.2% Hyaluronic Acid and is suitable for more severe cases of dry eye. The added strength gives a solution which is four times more viscous than Hycosan, but still doesnt blur your vision. Hycosan Extra is preservative free and can be used with all contact lenses. Ingredients 0Ingredients Usage 0Usage Warnings 0Warnings