Re: Where is the plane of Focus in AR?
I recall in the past (late 80s? who can remember) seeing a demo by some (IIRC) Canadian researchers of a screen overlay that altered the focus for each (small) region of a screen. The user/customer/victim's eyes would compensate by altering their lens until the object of interest was in focus (and much of the rest of the screen out of focus), providing another cue to "3D" viewing. The goal was to have a convincing 3D appearance with only one screen o render. Well, two, the "video" and the "focus adjustment, to lower resolution.
I am far from enough of a boffin to judge ho wwell this would have worked, as it was not a strong effect for me, but there was some effect, and it was not physically painful the way "we know all eyes are spaced exactly the same" typical 2-screen images.
Note that they were touting this for "not all that interactive" stuff like movies and typical Laser-Disk games, so could be pre-rendered.
Not the case for something seeking to auto-slander everyone in sight without massive amounts of layer-sheer.