At first it meant hitting a spot at the center of a target with an arrow.
VOA: special.2009.09.20
Vickers's advice is that when you've adopted your stance and are ready to putt, gaze calmly and steadily at the hole (or targetspot) for about three counts, bring your eyes back to the ball in one count and fix your eyes on the back (or top) of the ball for two counts.