It's Accommodative Esotropia (I called the wife back) which is apparently a version of or related to strabismus. The glasses should correct it and it's possible he'll grow out of it.
His actually vision is 20/20.
So, there's that. ;-)
Yeah, that's something like what Jim had. And he's got perfect 20/20 vision, too.
Sounds like nothing to worry much about.