No visual issues that we know of, just odd tastes at this point, but perhaps there is something up with that. I have only had one complete eye exam for him (regular opt. exam) about a year ago.

He did read and re-read both of the wimpy kid books, but they definitely have tons of pictures. I think everyone is right about breaking up the text into smaller bits.
He also really liked a collection of poems called 'It's raining pigs and noodles', again, lots of pictures!