I am stating that if all this 'vision' stuff is critical (and for the sake of argument, let's just say it is)....you STILL have to hit the object ball in the right spot.
To challenge some of this idea about vision center....all one has to do is learn to use CTE effectively.
If a shooter is still missing a lot of shots after using the 15, 30, 45, and 60 degree shot angles that Stan Shuffett teaches, THEN it's time to worry about a vision center problem, or a stroke issue, grip issue, elbow issue, stance issue, or whatever. Notice I said a "lot" of shots....not 'ALL'.
Even Stan and other CTE users miss shots. The idea is to greatly reduce the percentage of misses. Speaking for myself, after over 60 years of ghost ball guesswork, that has happened. The percentage of misses has dropped very-y-y significantly. (I do not care one bit about the "WHY it works".....it just does, and that's good enough for me.)
A good test of a straight stroke that is simple and quite superior to shooting down the table making the cue ball come back to the tip:=> Lineup, get into shooting position, aim...then close eyes and pull the trigger. If most, I said 'most', of the shots are successful then a straight stroke issue is not the problem. That comes right from Billy Johnson, Joe Cosgrove, Ralph Guest, Buck Bozeman, Eddie Taylor, and Danny Jones...that's not The Flash's preaching. The Flash is NOT an instructor, nor a champion, nor a wannabe 'red hot'. ...he is only an old, beaten down, well worn, shooter ranked in the top ten million of the world.
I think CTE will expose weaknesses quicker than any professional instructor techniques I've ever witnessed. I've seen a LOT of 'em too.