A video of Thorsten Hohmann and Mike Massey on lining up...
www.youtube.com/watch?v=BPn3Wzp4NT8
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Thanks RK.
Folks would do well to approach the shot line in this manner.
But
This opens up a whole new topic. Are your eyes seeing what you think they are seeing from a standing position. The eyes lead and the body follows.
Here is an interesting experiment you may want to try.
On your table, snap a chalk line, diagonally, from the center of one corner pocket to the center of the other end corner pocket. That line is straight, no arguments there.
Place an OB on the line a diamond or two away from one corner pocket, now place the QB three diamonds away from the OB.
From the standing position do your normal body line up on the shot line as you see it.
Assuming your right eye is the strongest in this example, after you have lined your body up with the shot line, close your left eye, is the shot appear to you to be straight in? If your right eye is the strongest.....it will appear to be straight in.
Still, from the standing position, close your right eye, does the shot still look straight in, I'll venture to say that it doesn't , in fact it probably looks like the QB may miss the OB to the right.
Because our eyes are separated approx. 2 1/4" pupil to pupil we have a built in parallax error when objects are close to us. This error does not exist at a distance of approx. 30'.
If your strongest eye is your right eye you would do well to line up your body based on what your left eye is saying is straight in.
When this is done properly it will make no difference which eye you open or close the shot line will look straight in from the standing position. The parallax error, has for the most part, been corrected. And now, you can put your body on the proper shot line.
There is more to this and it has to do with when you bend over into the shooting position.
Have fun.
John