> The method for diagnosing dyslexia, known as the discrepancy model, was relatively straightforward: test a child’s IQ and their reading age, and if there was a discrepancy between the two – average-to-high IQ, low literacy – that child was dyslexic. Elliott felt unsure about these assessments. The children he tested for dyslexia all struggled to read and write – that much was clear – but their literacy difficulties…
And I suspect that is probably true for most "dyslexics".
I have a pet suspicion that there is an actual dyslexia but that most diagnoses are simply a manifestation of 2 standard deviations of "everybody's brain is wired slightly differently and some things require more effort."
One of my relatives is really good at mathematical theoretical physics (probably better than I am, and I am no slouch), but doesn't read or write very well. I find it very difficult that someone who manipulates symbols that well has "dyslexia". More probably, he needed to devote more energy to reading but never did because he found it difficult.
Unfortunately, our current education system is not set up to handle any student who is outside one standard deviation of "normal" on any dimension.