I've been a bifocal wearer for about 10 years, and trifocal for the last two. I might be misunderstanding the problem here, but I think that it is in fact the camera-to-subject distance that matters. For reasons (physical, psychological or both) unknown to me, it is not the viewfinder image an inch or so away that your eye focuses on (or at least that your eye "thinks" it focuses on). My eyes certainly can't do that. You can demonstrate this by placing an object a meter or so away from a mirror, then focusing on the image in the mirror. You will find that you can focus on the mirror image from just inches away, though you couldn't possibly focus that close on the object itself. I don't know why this is, but it's clearly the case. If you're trying to use your VF with reading glasses that may be the source of the problem. Try it with whatever glasses you use, if any, for distance vision. Again, excuse me (and clarify) if I'm misconstruing the problem.....