Optrex Double Action's unique formula for dry eyes in multi-dose format is specially designed to provide instant hydration and relief for up to 6 hours. Its composition without preservatives helps to restore the natural balance of the protective layer of your eyes. Application of the drops. Wash your hands before using the product. Remove the security 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 that the entire eye is covered. Shake the container to remove residual drops. Close the container tightly. You can use Optrex Double Action for dry eyes in multidose format with contact lenses. It is suitable for daily use.