Iama ortho-k user. I wear contacts when I sleep to fix my eyes the next day.
Not really a big deal, but many don't know about it. I've been wearing them for a few years and they are not perfect but it works for me.
The gist is, you put them on at night, they mold your eyes a bit and you have 20/20 for about 24hrs depending on your prescription and correction zone. Larger and more severe mean less holding time.
So go and ask away, I know way more than I should have to about the subject. Getting working lenses was a bit of a long and drawn out process for me, and I learned a LOT in the process.
Edit: The worst part about this is that I can see everything, even when I go into the shower I can see that I really need to clean it, again. With glasses or contacts, blurry bliss. ;)
E2: Proof http://imgur.com/a/KDVfY these are my contacts (notice the weird curve/wave, that's the magic) and an old prescription.