I like demonstrating shots with closed eyes and then having the student do the same to emphasize how we can place trust in stroke and stance fundamentals, rather than making little fiddling adjustments with our hands when our eyes give us mixed messages.
In other words, if you take good aim and stance then close your eyes, you have little chance of scoring the shot if you start waggling the cue around other than straight back and forth stroking.
In other words, if you take good aim and stance then close your eyes, you have little chance of scoring the shot if you start waggling the cue around other than straight back and forth stroking.