I don't have an answer for you but I am curious to see what the experts say as my son has the same issue! He is a voracious reader - can read 7 hrs a day on weekends, retaining what he reads which is mostly non fiction/history. He is only 7 entering second grade but also prefers less text and is intimated by books without pictures even though he can read and comprehend them easily. He likes the "You wouldn't want to be and Who Was series along with graphic novels and Calvin and Hobbs. He has a documented tracking and convergence problem and has been in Vision Therapy treatment for 8 weeks.