Background: Squint (strabismus) is deviation of one of both eyes which can be paralytic (incomitant) or non_paralytic is due to many causes one of them the refractive error ( hypermetrobia, myopia and astigmatism).Strabismus may be esotropia (inward deviation of the eye) exotropia (outward deviation of the eye) / hypertropia ( upward deviation of the eye) or hypotropia (downward deviation of the eye).Hypermetropia (long-sightedness): Is a common eye condition where nearby objects appear blurred, but the vision is clear when looking at things further away. Hypermetropia in children. Is usually genetic. Babies and young children may suffer from hypermetropia, but this should eventually correct itself. This happens as the eyeballs lengthen as they grow. However, a lazy eye may develop as a result. This is because the eye with the weakest vision is ignored by the brain. If this is not corrected in young children, there is a risk that the weaker eye will never see as the other eye, where is squint happen. Objective: this study amid to detected the correlation between squint and hypermetropia as the hypermetropia is the major cause of squint of children under 6 years old age. Method: This study conducted from November 2017 to March 2018. 100 cases from Ibn AL_Haytham hospital 45 male (45%) 55 female (55%) with squint (esotropia) their age from 5 months to 5 years are examined their refractive error. Results: in this study 100 cases of squinting eye of children age from 5 months to 5 years (45 mal and 55 female) where examine in Ibn AL_Haytham hospital from November 2017 to March 2018 according to the age and sex the result that 99% (mostly esotropia) got hypermetropia. Conclusion: There is correlation between squint and hypermetropia mostly in children so in this study 100 cases of squinting eye of children age from 5 months to 5 years (45 males and 55 female) where examine in Ibn AL_Haytham hospital the result that 99% (mostly esotropia) got hypermetropia (1.25 diopter to 8 diopter). This study highlights the close associations between refractive error (hypermetropia) and the prevalence of Squint (esotropia), which should be considered when managing childhood refractive error.