So by "visual lines" you mean the physical lines that the edges actually lie upon, and by "physical lines" you mean the apparently converging lines you "see" in perspective?Totally different-- visual alignment means two points meet on a vertical plane (straight up/down in your field of vision, regardless of distance).
That's kind of a backwards way of using the terms, but it doesn't matter. None of the lines change, either physically or visually, when CB/OB distance changes. The single physical line you sight directly along obviously doesn't change and the other two converging lines you visualize in perspective also don't change. The distance of the OB makes absolutely no difference.
Doctor, heal thyself.Stop hating...
pj
chgo