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Orthokeratology refers to the creation of gas permeable contact lenses that temporarily reshape …. safety advice applicable to most modes of contact lens wear, also applies to ortho-k night-time lenses. An article in the January 2005 issue of …
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… (ortho-k) and corneal refractive therapy (CRT) overnight contact lenses for myopia. … for best results, you should wear the ortho-k lenses every night.