Great explanation Joe thanks!
I went to the TruGlo web site and this is the explanation listed:
PARALLAX
Parallax is an unavoidable optical phenomenon where the image of the reticle (the dot) and the target are in two different image planes (locations). This phenomenon presents itself as an apparent change in the position of the reticle against the target when the shooter’s eye is moved significantly away from the center of the field of view. Your Truglo red dot has been carefully aligned to have minimum parallax at a specific distance. (30 yards for non-magnification models and 60 yards for 2x models) At distances greater or less than this, some parallax will be observed. To reduce the possibility of a point of impact shift caused by parallax, try to keep the reticle (dot, cross, or other pattern) in the middle 2/3 of the field of view.
So according to this as long as the red dot is close to center of the eye piece I should be good. Next time I sight in I'll test it and see.
Ya know the article I read in North American Hunter is a little misleading....
It made it sound like it didn't matter at all.