My son has dyslexia, has an ADHD diagnosis, and is likely HG underneath it all (though he tests at slightly under HG).
He did vision therapy before he had a dyslexia diagnosis, and to her credit, the optometrist said after she evaluated him that she had "an answer, but not the answer."
I believe that VT helped him quite a bit, though it did not treat the underlying dyslexia. I think it particularly helped with allowing him to develop his strengths (M strengths, if you're read The Dyslexic Advantage). A bit of concrete evidence I have for this is that his block design score on the WISC IV went up by 6 points after VT (his IQ was tested about a year prior to starting VT and again about 4 months after finishing). Obviously the change could have been due to a number of factors (and probably was) but apparently depressed block design scores are a red flag for vision issues.
