welcome to healthcare magic
hi from the above history the diagnosis of exotropia
,a type of outward squint
is lack of coordination of all the 6 muscles of the eye.the treatment which you are giving is vision therapy
and glasses have no role in exotopia .the choice of treatment is surgical for strabismus
,after which he will be given glasses .it has got good results if usually done before the age of school .
take care thank you