Keeping your eye on the ball as the Keeper also means understanding the
capabilities of yourself and your opponent.
As the Keeper is watching play develop and what amounts to be the “invasion” of the mid-field, and the defensive half, it also means the need to understanding the opponents passing successes & capabilities, their ability to change the point of attack, their control play to maintain possession. .
Watching and understanding their player positioning as they approach is critical to understanding where the Keeper needs to position to defend appropriately.