I came across this video on orthokeratology . I believe it is from 2002, however it is still very relevant and the information still applies to how ortho-k is a safe, viable, non-surgical option to vision correction. Studies have also shown that overnight ortho-k may prevent or slow the progression of nearsightedness in children.
[youtube=http://www.youtube.com/watch?v=1ENeAjUSAoQ]