I'll bite. Though I don't think that this is a one size fits all thing. Different methods will work better for different people. So all I can say with confidence is what works for me. And it should be noted that I am NOT a "bullseye shooter". When I shoot for finite accuracy I most definitely use a different technique.

First off, and most importantly, with both eyes open I find a point of focus on the target. Be that a zipper tab, or a button, or a medallion, or a gold tooth, or the end of a nose. With my focus there, I extend the pistol out and up slightly if necessary in order to bring the sights into my "fuzzy vision". What I am looking for is simply a flat line, and two as you call them; light bars.

The flat line is formed by the front and rear sight being level. For my eyes it is much easier and much faster to detect a line bowed up or down than to try and finitely adjust "top of this and top of that" - I simply look for a short flat line with two light bars approximately the same size (and I judge that 100% intuitively) SUPERIMPOSED in my line of vision.

With this said, I do not believe it is my "skill at arms" that facilitates this technique. I believe it is knowing my natural point of aim, reinforcing it through both dry and live fire.

. . is that response what you were looking for, Lawrence? I can be much longer winded if you want . . . . .