A recent large population study concluded “In this large nationally representative sample, the prevalence of ADHD was greater among children with vision problems not correctable with glasses or contacts. The association between vision problems and ADHD remains even after adjusting for other factors known to be associated with ADHD.”
Essentially, regardless of your opinion or otherwise of the source or ultimate “cause” of dyslexia, or any reading difficulty for that matter, it doesn’t change the advice that people of all reading abilities deserve to have their vision problems properly and fully managed. One might argue that it’s even more important for someone already struggling to be freed from the additional burden of a vision problem.