Soft lenses has these general classifications based on frequency should be discarded:
* Day disposable lenses — discard after a single day wear
* Disposable Lenses — discard every two weeks, or sooner
* Frequent replacement lenses — discard monthly or quarterly
* Lenses (reusable) traditional — discard every six months or more
Contact lenses are gas permeable lens that are more resistant to deposits and do not need to be discarded as frequently as soft lenses. often, GP lenses may last a year or more before they need to be replaced.
