Write the next sentence in this paragraph:

How to put in ortho k lens
Clean your face and hands.
Since you will be touching your eye directly when inserting the contact lenses, you'll want to avoid getting any dirt or germs into your eyes. Wash your hands with soap for at least 30 seconds, and dry them on a clean towel.
If you have long hair, tie it up while you're putting in the contact lenses. Hair can distract you by getting in your eyes, and could also transmit dirt and germs onto the lenses.