http://www.wenxuecity.com/bbs/archive.php?SubID=health&pos=top&keyword=Ortho-K&x=23&y=18&t=1
http://www.wenxuecity.com/bbs/archive.php?SubID=znjy&pos=bbs&keyword=Ortho-K&t=1&c=1
Ortho-K
Orthokeratology (Ortho-K) is a non-surgical procedure that involves the wearing of a series of specially designed rigid contact lenses to progressively reshape the curvature of the cornea over time. The results of the painless procedure are not permanent; thus, retainer contact lenses must be worn periodically to maintain improvements made in vision. Ortho-K is used to treat low to moderate nearsightedness and low degrees of astigmatism.
http://www.exceleyecare.com/pages/5/Qna-CRT.htm