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Corneal refractive therapy (CRT) or orthokeratology is a non-invasive procedure that helps align your vision as you sleep. The procedure employs the use of a gas-permeable contact lens that mildly reshapes your cornea. This procedure is done at night as you sleep which leads to clear vision during the day. A successful procedure guarantees that you will no longer need to wear contact lenses or spectacles during the day.