An orthoptist is an optician with special extra training who treats eye conditions - an optician's work being to diagnose and prescribe glasses/contact lenses. Orthoptists treat disorders of vision, eye movements, and eye alignment. Problems can occur for dyslexic and dyspraxic children with their dominant eye -- for instance, if they are completely right handed, but their left eye is dominant. The eye's focus is not fully mature before the age of 7, but those children who develop a dominant eye may do so between the ages of 5 and 9 years. Not everyone develops a dominant eye.
Dyslexia and Vision: In this talk (the first part of his lecture given to dysTalk) Professor Bruce Evans provides an introduction into what dyslexia is and an overview of the visual difficulties associated with dyslexia.