Actually the convergence and the focus reflexes are pretty tightly bound; that is what makes the "Magic Eye" pictures and other stereograms so difficult and eye-wrenching to view. One has to consciously disconnect the two accommodations that we have been training to couple all our lives.
There's some evidence that much of the depth perception comes from difference in geometry of the images in the two eyes, not the pure parallax in itself. We see the differences in distances of complex shapes, not the distances to simple point objects. Even though there is a mechanistic similarity to the split-image distance meter, apparently the human perception does not work quite that way.
From what I recall, distance perception for monoptic humans mostly comes from motion cues, often requiring a movement by part of the observer.
(no subject)
There's some evidence that much of the depth perception comes from difference in geometry of the images in the two eyes, not the pure parallax in itself. We see the differences in distances of complex shapes, not the distances to simple point objects. Even though there is a mechanistic similarity to the split-image distance meter, apparently the human perception does not work quite that way.
From what I recall, distance perception for monoptic humans mostly comes from motion cues, often requiring a movement by part of the observer.