Someone put up an image on Facebook last night that I had never seen before, but have seen similar ones, ones that demonstrate that the mind doesn't process letters of words when you read, it matches patterns. Substitute a "7" for a "t" a 5 for an "s." The shapes are similar. Here is the image:
Now I know what dyslexics must be seeing when they attempt to read some text. I once had a profoundly dyslexic student whose writing was unintelligible to me. It was like a foreign language. Then one day I figured it out. He was embedding whole words inside of other words. The breakthrough was in answering a question on a lab worksheet. What he wrote was "Heatiting." What he meant to write was "Heating it."