It's called Ortho-K, or Orthokeratology, and involves wearing special contact lenses while you sleep, to correct the curvature of the eye. When you wake up the next morning and take out the lenses, you have perfect vision throughout the day. Well, I remember reading a couple of years ago about eye-repairing contact lenses being developed by an Australian university. I think the ones in the article are different, but it's good to know glasses/contact lenses will eventually be short term/redundant.

What is Ortho-K? The procedure has its roots in a Chinese technique, in which sufferers would sleep with small bags of sand on their eyes. Because myopia is caused by the eyeball lengthening, the weight of the sandbags would temporarily flatten the eye. Ortho-K was discovered 40 years ago, when opticians noticed that some patients could see better after they removed their contact lenses. At first, a series of lenses were needed, each one flattening the cornea to a small degree over a period of weeks. It is now possible for vision to be restored in two days.