when the camera is turned off the lens retracts and a cover mechanism closes over the lens. it's great pocket camera. it's always good to check for lint on any camera lens as none are completely lint-proof.
yeah, i do carry mine in my pocket and the lens is closed. it wouldn't fit in my pocket otherwise. lens closed, dirt and lint can't get in. if i'm on the beach or somewhere that it may get dirty, it's in a plastic bag in my pocket.
Point and Shoot cameras close their lens automatically every time they are turned off, in which case the lens will not get dirty. Why would you carry the camera in your pocket without turning it off? These cameras generally turn themselves off, closing the lens, after only a few minutes.