My eye doctor calls them an "overnight" lens. I used to wear extended wear contacts but forget the brand. When disposables were invented, I switched to them and wearing them overnight does not work for me. I have had great success with daily wear soaking them in Renu overnight and wearing them daily for 2 weeks, then I toss them for a fresh pair. Your eye doctor should be able to explain the difference in your particular case. The people I know that have problems with contacts pushed the rules too far and didn't take care of their lenses.