Also, in many common situations, such as taking a simple picture of a single face or object, the refocusing ability just doesn't come into play, since it works best when there are multiple objects arranged so that some are in the foreground and some are in the background.

WSJ: Lytro Takes Fresh View on Picture Taking

Using motion-detection algorithms, the BriefCam software separates the background (static or non-moving objects) from the moving objects, tracking and analysing any motion within the frame.

ECONOMIST: Monitor