It sounds like he has some convergence issues. One of the kids I tutored in reading started reading much faster when I put a yellow or blue overlay on top of the passage. He said that made the print easier to see. He reported problems with the print as well, like seeing the type superimposed hovering above the other type (double vision). I finally convinced his classroom teacher that there could be a problem with his eyes and the teacher called the dad who said he has the exact same vision issue.
Not sure if they ever got the situation figured out. The teacher said there was an obvious difference when he used an overlay as well. I tried it with other kids and they all said they liked it and it made the print easier to see, but I didn't notice a difference in how they read.
