This study aimed to evaluate changes in binocular visual function in patients with different ages before and after surgery to explore the optimal timing of intermittent exotropia surgery. The study comprised 28 females and 25 males. Fifty-three patients were split into three groups of <7 years, 7-13 years and >13 years. Median age was 6.07, 10.82 and 16.298 years respectively. They were examined preoperatively and at two and six weeks postoperatively. A total of 32% had a family history of strabismus and 38% had their strabismus detected during routine physical examination. The angle of deviation at near and distance significantly increases with older age with median angles of 55, 45 and 85PD respectively for the three groups at near fixation and 37.5, 40 and 80PD at distance fixation. Near stereoacuity improved significantly as did distance stereoacuity. Peripheral and central fusion improved postoperatively and improvement was noted across all age groups. The authors propose that surgery for intermittent exotropia can be postponed appropriate to the case.