I would think the VT would be pretty much the same. Just the other day I was chatting with an optometrist about convergence. Say you look at the brock string and are trying to look at a particular bead (it's just a string with a bead that goes out in front of you; google probably has images). Anyway, she said if you're seeing the string make an X beyond the bead, that's convergence insufficiency, whereas if you're seeing it make an X in the foreground in front of the bead, that would be the excess.
