Orthokeratology which is also known as ortho-K is the treatment of corneal re-shaping from overnight vision correction.
A select few opticians now offer this service which is to use a specially designed rigid gas permeable (RGP) hard contact lens, which is worn overnight and fitted by the optician, and this lens helps to alter the shape of the cornea – which is the transparent part at the front of the eye.
With the specially adapted flat top, the contact lens helps o reshape your eye and it will consequently reduce or correct a low to moderate level of myopia – short sightedness. It can also assist in low levels of astigmatism.