A common myth about dyslexia is that it’s caused by weak visual processing.
One reason this myth is so stubborn is because it sounds reasonable. After all, we use vision to read, so if reading is hard, there must be a problem with the brain’s visual system, right?
Scientists have known for years that the real cause of dyslexia lies in the brain’s auditory system. Kids and adults with dyslexia who confuse letters like b’s and d’s don’t do it because they see the letters as the same, but because they hear them as the same.