Examine each contact lens before inserting it to make sure its not damaged. Discard any damaged lenses. While contact lens use is safe, not caring for contact lenses properly or failing to follow contact lens safety rules can lead to serious problems. Contact lenses can be a potential point for infection, says Dr. Steinemann. No matter how careful you are, germs are on our hands, eyelids, everywhere. When germs such as bacteria and fungi are on the contact lens, they can invade the eye.