Vision Shaping Treatment

My eye doctor today told me about this and I'm wondering if anyone uses it or knows anyone who does. These are contact lenses to be worn at night to sleep that re-shape the corneas. They are taken out in the morning and within a couple of weeks, vision is supposed to be 20-40 or better for a whole day. The drawback is that they have to be worn every night, but the good part is that there's no surgery. Any comments?