The unique formula of Optrex Dual Action for Dry Eyes Multi-Dose is specially designed to provide instant hydration and relief for up to 6 hours. Its preservative-free composition helps restore the natural balance of your eyes' protective layer. Applying the drops: Wash your hands before using the product. Remove the safety seal before first use and remove the cap. Tilt your head back and apply 1 or 2 drops to each eye. Blink several times to ensure the entire eye is covered. Shake the container to remove any residual drops. Close the container tightly. You can use Optrex Dual Action for Dry Eyes Multi-Dose with contact lenses. It is suitable for daily use.