The answer is: Blueberry Lutein cannot be instilled while wearing contact lenses. You need to wash your hands and remove the contact lenses before use. Then lie down or sit down, tilt your head back, and gently open the lower eyelids with your thumb and index finger. Then, turn the solution bottle upside down and drip it into the eye from the eye dropper, 1-2 drops each time, 2-3 times a day, and continue to use it for at least 2 weeks.