Inclusion Criteria:  Infants and children up to the age of 15 years. Primary Concomitant divergent squint (1ry concomitant exotropia) Candidate for surgical correction of squint  Exclusion Criteria:  Children with:  Paralytic squint Consecutive exotropia Any neurological disorder History of previous squint surgery History of previous other ocular surgery (e.g. congenital cataract & glaucoma) Children who missed follow up.