"There are none so blind as those who will not see".
Here is some corroborative evidence for you to ponder.
Ms. Nancy Hennessy who was the President of International Dyslexia Association from 2013 to 2015 said:
“……even if we settle on a middle number, let us say 10%; that still leaves a lot of children who are not dyslexic, whose brains are not wired any different way, who have reading difficulty.”