There are a lot of people that don't feel comfortable wearing cheap polycarbonate lenses, which is the default kind a lot of places will sell to you. If you felt like the world looked distorted, and you didn't adjust after a day or two of full-time wear, then you might be one of them. The solution is usually to upgrade to a high index lens (they're made from different, higher density plastics) for a bit more money. I've never been able to tolerate poly lenses; I got them once at LensCrafters (which calls them "Featherwates") and had to return them.