Presence tells us whether we are in contact with experience. Focus determines where within that experience we place sustained attention.
Presence determines whether we are actually in contact with experience.
Focus determines where within that experience we place sustained attention.
Without presence, focus can become tunnel vision. We become excellent at concentrating on the wrong thing.
Without focus, presence may remain wide but diffuse.
Together they create intentional attention. We can notice what is happening, decide what matters and stay with it long enough to respond intelligently.