Repairing sight by night

By Emma Young in Sydney CONTACT lenses worn only at night can temporarily correct long-sightedness by altering the shape of the cornea, a small pilot study suggests. The approach could be an alternative to surgery for people who do not want to wear contacts during the day. The method, called ortho-k or orthokeratology, is already offered by a few clinics worldwide for treating short-sightedness, or myopia. Rigid gas-permeable contact lenses flatten the central region of the cornea, correcting moderate myopia. But when the contacts are removed, the cornea gradually resumes its normal shape,
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