I dont know if it was mentioned but here's how we were taught in archery..
stand still and point to something, stay steady. close one eye and then the other without moving your pointing finger. the object will appear to move from alignment of your pointing finger. It'll move more when you close your dominant eye.
I found my left eye is dominant, also I dont have the muscles to close my left eye and not my right but I can wink the other way..
If Im on the phone or computer lots and strain my eyes then look at car tires , they appear lile the car is sitting on the road. as if the car has really really low profile tires.
In archery , left eye dominance meant I had to pull the string with my left , I found that so awkward I lost interest in archery..
with pool Im sure it affect me but I do my best.. maybe if I video myself making shots I;d learn more about how Im aiming without thinking about it too hard.
I like the exercise where hes aiming down the middle of the table , then without moving the cue, looking down noting how well his cue is actually alligned with a mark under the butt end.
personally I think Im stll finding my way. maybe if I dont worry too much Ill just find that natural position and find that perhaps I make slight adjustments without relaizing it. I thnk videoing myself might help me loook at myself with the cue without stressing or thinking about it.. I may find Im consistent or maybe not. I will say I do seem to have days wehn Im spot on accurate and others where Im terrible so that tells me Im inconsistent, why? , that's a big question.
funny how it seems that quite often I can see another player is lined up or not because Im looking from behind the object ball.. Its usually not the best time to tell the player as he's lining up and the distraction isnt' goood but often I feel I could just yell stop and correc the other player. I refrain because it's bad practice but Ive had other more experienced players say things like the cue wasn't' under my chin and I missed because of that.
one showed me to aim like Im shooting a ball down the rail , wiht both balls on the rail, then look down to see if my cue is actually straight to the rail.. Its similar to what he video showsexcept hes in the center of the table.
one part bugged me, the way hes using a ball to tap on the other ball over the spot, I feel he's he wrecking the cloth in a rather sensitive spot by compacting it. I've been shown that the right way to place balls in snooker is to put the ball near the spot and then roll the ball onto it rather than continuously being in the habit of dropping the ball down hard right on the spot.. doing that, over many times creates a spot where the ball wants to sit, or stop, or even wear through to a hole there.. My impression that this is not good practice if you care about the cloth. he had a nicer way, using the paper hole repair ring things.