What Is Ortho K?


Quick Answer

Ortho-K, or orthokeratology, is the use of contact lenses to temporarily reshape the cornea of the human eye. These lenses are worn overnight and removed during the day. The cornea retains its changed shape throughout the day, and vision remains clear.

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Full Answer

Ortho-K is most commonly a treatment for nearsightedness, but newer models of lenses have found use in treating farsightedness and astigmatism as well. These lenses must be custom-fitted to the wearer and are more expensive than traditional contact lenses. Because the change is not permanent, the lens must be worn every night. Wearing the lenses overnight also presents an increased risk of infection compared to normal contact lenses used for daily wear.

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