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Orthokeratology, also known as overnight Ortho-K, is a treatment in which an individual wears special contact lenses while he sleeps at night. The lenses correct the shape of the cornea, so when the patient wakes up his vision is good for the day.
The way it works is that the central part of the contact lens puts gentle pressure on cornea and actually changes it shape, so the cornea curvature is decreased by putting gentle pressure on the lens, thus reducing the myopia.
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