[dkerby]

An old pro, with a lot of talent, teaches keeping the eyes
focused on the ball but closed eyes during the swing for practice. In other
words the eyes are in the mind and do not move in the socket.
The pro has students working on the idea with great success.
He says that students that just focus on the swing rather than
the actual hit have problems. Women tend to have the "just swing"
problem where as men tend more to " hit something".

I find, as a pilot, that during insturement flying, their has to be a
focus on instruments. The inner ear gives false signals when the
eyes do not have a focus. My opinion is that Kennedy crashed
because he looked down at the fuel selector on final rather than
keeping his eyes focused on the insturments. Then his inner
ear gave him a false signal as to what the aircraft was actually
doing. Moving the eyes around gives the job of balance to the
inner ear which is not reliable in quick body motions.