In Game of Thrones Tywin Lannister has the following conversation with Arya Stark. Though the point of the conversation is mainly to pry into Arya's secret identity the following sounds like Jaime Lannister has dyslexia.
Tywin Lannister: Who taught you to read?
Arya Stark: My father, my lord.
Tywin Lannister: Hmm. I taught my son Jaime to read. The maester came to me one day, told me he wasn't learning. He couldn't make sense of the letters. He reversed them in his head. The maester said he'd heard tell of this affliction and that we simply must accept it. Ha! After that, I sat Jaime down for four hours every day until he learned. He hated me for it, for a time. For a long time. But he learned.
Game of Thrones, Season 2 Episode 6, "The Old Gods and the New"
This story is then reiterated by Jaime himself although the amount of time spent is different.
Jaime Lannister: I hated to read as a child, but my father forced me to study the books every morning before I could practice with sword or horse. Two hours every day holed up in the maester's chambers. I learned a lot of fancy words.
Game of Thrones, Season 3 Episode 3, "Walk of Punishment"
I've had a look around to see if Jaime is supposed to have dyslexia in the books too but haven't turned anything meaningful up yet that could point to him having it. My gut feeling is this is a show only story, especially because it initially occurs between Tywin and Arya.
However, I would like to know if anything in the books points to Jaime having dyslexia? If not what evidence is there that this is a show only event?