Paragon CRT Lenses are contact lenses you sleep in and take out for perfect vision.  Corneal Refractive Therapy works by re-shaping your corneas while the lenses are in your eyes overnight.  You take out the lenses in the morning and the vision correction should last until you're ready to go back to bed.  The first pair will cost you $1500 and annual replacements about $300.
Read more at Popular Science.