Control Grade of Intermittent Exotropia and Related Factors

Park, Byung Chun; Lee, Ju Yeon

Abstract

PURPOSE: To determine the degree of control-grade of exotropia and related clinical factors in patients diagnosed with intermittent exotropia.
METHODS
One hundred seventy-six patients with a diagnosis of intermittent exotropia were evaluated for control of their deviation. The relationship to age at onset and diagnosis, time interval between the onset and diagnosis, refractive error, visual acuity, near stereopsis, angle of deviation, type of exotropia, accompanied hypertropia, oblique overaction and AV pattern were investigated.
RESULTS
Mean control grade is 2.76+/-1.56 point and 114 (65%) were within range of grades from excellent to fair. Poor control of exotropia was significantly correlated with poor near stereopsis (p=0.000), long time interval (p=0.033), binocular amblyopia (p=0.000), large angle of exodeviation (p=0.028), convergence insufficiency type (p=0.017), accompanied hypertropia (p=0.008), AV pattern (p=0.003), and oblique overaction (p=0.000). Among these factors, the influences of stereopsis, hypertropia, oblique overaction, convergence insufficiency type were statistically significant when multiple linear regression analysis was performed (p=0.000, 0.026, 0.044, 0.011 respectively).
CONCLUSIONS
The factors of near stereopsis, accompanied hypertropia, oblique overaction and convergence insufficiency type correlated significantly with control of exotropia which may interfere with fusion and contribute to the prognosis of intermittent exotropia.