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KMID : 0360220130540071097
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Journal of the Korean Ophthalmological Society
2013 Volume.54 No. 7 p.1097 ~ p.1103
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The Surgical Outcome of Intermittent Exotropia with Good Binocular Function
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Kim Kyung-Tae
Choi Duk-Kyu
Choi Mi-Young
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Abstract
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Purpose: We investigated the success rate of surgery and binocular function after surgery in intermittent exotropia with good preoperative binocular function. Methods: Thirty-eight intermittent exotropia patients who had good stereopsis of 40 seconds according to the Titmus test, showed fusion by Worth-4-dot test preoperatively, and had at least 1 year of postoperative follow-up were included in the present study. The age at operation, angle of exodeviation, visual acuity, stereopsis with Titmus test and fusional status with Worth-4-dot test after surgery were analyzed. A surgical success was defined as postoperative angle of deviation less than 10 prism diopter (PD). Results: The patient mean age at the time of the operation was 7.9 years. The mean preoperative angle of exodeviation was 25.5 PD at far distance and 27.5 PD at near distance. The mean follow-up time was 22.9 months. The success rate of surgery was 81.6% at 6 months, 68.4% at 1 year and 60.5% on the last visit. Seventeen patients (44.7%) had stereopsis of 40 seconds and showed fusion at far and near distance after surgery. The stereopsis was worse than 100 seconds in 2 patients (5.3%), and fusion was maintained at only near distance in 15 patients (39.5%). In 7 patients (18.4%), the stereopsis decreased to 200 seconds or worse, or there was no fusion after surgery. Conclusions: The recurrence of exodeviation was a major cause of the surgical failure in the intermittent exotropia with good preoperative binocular function. Moreover, binocular function may decrease postoperatively in intermittent exotropia with good preoperative binocular function, so careful follow-up may be required to maintain this function.
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KEYWORD
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Binocular function, Fusion, Intermittent exotropia, Stereopsis
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