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The shape of the eye can be changed temporarily through the use of hard contact lenses. This process is known as orthokeratology and involves the use of progressively flatter lenses to reshape the cornea. Once the desired shape is achieved the wearer switches to a maintenance contact lens which keeps the cornea in the desired shape. The effects of orthokeratology are only temporary and if the user does not wear the contacts for a few days the cornea may return to the original shape.