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HYCOSAN DUAL (0.05% Sodium Hyaluronate and 2% Ectoin) is recommended for Allergy Related Dry Eye. Hycosan Dual is preservative-free, sterile for 6 months from opening and contact lens compatible. HYCOSAN DUAL provides protection against environmental allergens and relief for itching and burning eyes. HYCOSAN DUAL is the only preservative free eye drop with precise dosing specially formulated to combine (0.05%) Sodium Hyaluronate and (2%) Ectoin. It forms a natural dual barrier against environmental allergens such as pollen, dust particles and animal hair.