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Did you have the inability to read books? I notice that I simply cannot focus on reading a book to save my life. I can read internet comments and articles all day though. If I try to read a book I get annoyed that they're "not making their point" fast enough, especially with fiction and visual descriptions of people and places. I used to just complain about it, but now I wonder if thats actually pinpointing something…
You might check out BeeLine Reader (I am the creator). [1] It's fairly popular in the ADHD community because it enhances visual focus while you're reading. Some people are able to read for 2x-10x as long with BeeLine versus without. I'm always happy to help out HNers with a free code for our browser plugin, just shoot me an email (contact in profile). 1: http://www.beelinereader.com
Another reader helper I liked was the one that flashed words in place but that seemed more like a speed read hack rather than actually comprehending what you read, never used it seriously like BeeLine