Orthokeratology lenses are specially designed rigid gas permeable (RGP) contact lenses that are worn overnight and taken off in the morning. They temporarily reshape the corneas while your child sleeps. This altered shape corrects their myopia so that prescription glasses and normal daytime contact lenses don’t need to be worn during the day. The Paragon CRT Contact Lenses are the first therapeutic lens design approved by the FDA for overnight orthokeratology for the temporary reduction of myopia. Some adaptation is required during the first two weeks of lens wear and there is a small chance of an eye infection with ortho-k lenses, although the risk is very low (less than one case per 500 years of wear).