The Centers for Disease Control and Prevention (CDC) makes clear, "Contact lenses can provide many benefits, but they are not risk-free---especially if contact lens wearers don't practice healthy habits and take care of their contact lenses and supplies. If patients seek care quickly, most complications can be easily treated by an eye doctor. However, more serious infections can cause pain and even permanent vision loss, depending on the cause and how long the patient waits to seek treatment.
The CDC recommends the following for contact lens wearers
Schedule a visit with your eye doctor at least once a year
Take out your contacts and call your eye doctor if you have eye pain, discomfort, redness, or blurry vision.
Understand that eye infections that go untreated can lead to eye damage or even blindness.
The Food and Drug Administration (FDA) indicates: