ABSTRACT
ABSTRACT: Purpose: To evaluate the influence of orbital factor on the development and outcome of surgery for intermittent exotropia. Methods: This study includes 210 intermittent exotropes (X(T)), 27 esotropes (ET), and 22 children without strabismus (Normal). The width and height, inner interorbital distance (IIOD), and outer interorbital distance (OIOD) in both orbits were measured with skull A-P roentgenogram. Orbital index (OI, IIOD/OIODX100) was calculated. In X(T), the results of 16 recurrent X(T) and 24 consecutive ET were also analyzed. Results: The IIOD was 25.2 3.19 mm in X(T), 21.2 3.41 mm in ET, and 22.7 4.44 mm in Normal. OI was also greater in X(T) (24.6 2.47 mm) than in ET (22.2 2.62 mm) and Normal (23.1 4.21) (p 0.05). It was greatest in 16 recurrent X(T) (25.7 2.01) and was smallest in 24 consecutive ET (23.8 1.46) (p 0.035). Conclusions: X(T) and recurrence after surgery for X(T) is more prevalent in children with longer IIOD and larger OI than in orthophoric children.
