So you have lost something by dropping it on the floor. Maybe it is a screw, a stone from a ring or just something so small you cannot find it on the floor. It may have fallen into the pile of the carpet.
Here is a very clever idea to find these things. Using your vacuum, take a pair of tights, stockings and stretch over the head of the cleaner and vacuum in the area where the item was dropped. The item should be picked up by the cleaner and caught by the stocking.