People – dyslexic or not – recognize words by their entire shape, not letter-by-letter. (This is why if you want a word to be recognized from far away – like on a road sign – you should put it in mixed/lower case, not upper case, even though upper case intuitively seems like it would be better because it’s ‘bigger’. People are more used to seeing words in mixed or lower case, so they will more quickly recognize them.)