Dominant Eye before any aiming system

[SSP]

Yes, the vision center isn't always or even mostly under the dominant eye - but it often is. (P.S. "Often" doesn't mean "mostly", and "under the eye" doesn't mean "exactly under the pupil".)

Yes, if it's a choice then it's more important to have the cue in the vision center position than directly under the dominant eye. How does that affect the definition of "often"?

pj
chgo

Because a couple of millimeters at the cueball can mean a 1/4" at the object ball which means you probably missed your shot and you don't understand why you missed it, you think you are doing everything right and you may be doing so, the problem is your cue is not traveling in the path you think it is and causing unwanted English