Most golfers swing the club slow enough to see the club head "blurrr" swinging through to impact. It takes a bit of practice to train the eyes to pick up the moving club head "blurrr" as the club head enters one's view area as the club nears impact, and beyond. By keeping your eye on the ball, after a little practice you will see the club head "blurrr" enter the impact area. If you see the moving club head, it is almost impossible to move your head to soon. This is also a good way actually see what path your club head is taking to impact the ball. If you want to speed up the process put a piece of bright colored tape on top of the club to help pick up the club head faster, when practicing.
Not saying this is possible for those with light speed swings, but it will work for those who swing in the 80-90-100mph range.
Also this is not my idea, or something I just made up, but was shared in a seminar some years ago by Dante, and Diegal, both PGA pros....GJS