Dyslexia: dys, from Middle English dis meaning bad, difficult, from Middle French and Latin dis, from Latin dys, from Greek; akin to Old English to or te meaning apart and Sanskrit dus meaning bad or difficult, + lexis Greek for word, speech.
Be warned, I am dyslexic, though midlly compared to some. I'm going to give you a visual. I'm not a great speller and I make typos, mostly reversing letters (as in mildly above) and I sometimes confuse letters as in g for c because I mis-hear them in my head. I am not going to correct the mistakes, which is difficult for me not to do. I'm used to editing as I go. This is also rather soul bearing (baring? See, I'd have to stop and look it up.)
My mother realized early on there was something different about me, that I didn't learn the same way my sister did. Erva, who is more like our father in the brain department, thrived on studying and tests. She made straight "A's" and went to college on scholarship. Mom, brilliant woman that she was, realized it would not be a good thing to put us in the same school. She didn't want me to be compared to my sister and thus avoided alot of sibling rivalry.
I struggled in school. Math was particularly hard. I still do not know all my times-tables. Numbers just do not stay in my head. They dissapate like fog. I can do your basic stuff; add, subtract; multiply and divide, but anywhere in the process I can flip two numbers and come up with a wrong answer.
I worked hard for the grades I got, making a good solid B average (math never got above a C) and somehow came in 6th in my glass (er class.) But, through no fault of my own I lost two years of school, graduating 12 days before I turned 20. So by that time I was so sick of school I had no interest in going on to college.
Another area that has always frustrated me is music. I have a good ear. I used to sing pretty darn well (I sang in a jazz trio for a while.) But I've never been able to learn to read music, much as I would like to. Those little black dots on those lines don't make sense. It's like they move around. It's for certainly I can't tell a quarter note from an eighth from a whole note. Sign (sigh.)
Luckily dyslexia has nothing to do with intelligence or creativity.
I'm in good company. A few mafous (famous) dyslexics are:
Leonardo da Vinci, George Washington, Tom Cruise, Jewel, Thomas Edison, Walt Disney, John Lennon, Sir Winston Churchill, Whoopy Goldberg, Thomas Jefferson.
As for authors who couldn't sepll (spell) there's, Faulkner, Fitzgerald, Hemingway, William Butler Yeats, Hans Christian Anderson, Lewis Carroll, Edgar Allen Poe, Agatha Christy, Mark Twain....
You can read about others here and here. You will note that dyslexia seems to be more of a mlae (male) thing than female.
We are simply wired differently.