J Korean Ophthalmol Soc > Volume 58(10); 2017 > Article
Journal of the Korean Ophthalmological Society 2017;58(10):1169-1175.
DOI: https://doi.org/10.3341/jkos.2017.58.10.1169    Published online October 15, 2017.
Comparison of Exodrift between Natural Group and Postoperative Group in Intermittent Exotropia Patients.
Yu Mi Lee, Myung Won Lee, Sung Eun Kyung
Department of Ophthalmology, Dankook University College of Medicine, Cheonan, Korea. kseeye@hanmail.net
간헐외사시로 외직근후전술을 시행한 환자군과 경과관찰한 환자군에서의 사시각의 변화량 비교
단국대학교 의과대학 안과학교실
Correspondence:  Sung Eun Kyung,
Email: kseeye@hanmail.net
Received: 30 March 2017   • Revised: 6 September 2017   • Accepted: 24 September 2017
To compare the exodrift between unilateral lateral rectus (ULR) recession and observation groups in moderate angle intermittent exotropia (IXT). METHODS: A retrospective study was performed in 769 patients who were diagnosed with IXT from 2005 to 2015. Seventy-six patients were enrolled in this study that presented with IXT of 20 to 25 prism diopters (PD) on their first visit and were observed for more than 6 months without or after operation. The observation group (group 1) was composed of 29 patients who had regular examination without operation. The surgery group (group 2) was composed of 47 patients with ULR recession that were observed for deviation changes since surgery. RESULTS: The mean age was 71.8 ± 22.0 months at first visit in group 1 and 91.1 ± 18.9 months before surgery in group 2 (p < 0.01). The distant exodeviation was 22.9 ± 2.5 PD at first visit in group 1 and 22.9 ± 2.4 PD before surgery in group 2 (p = 0.89). During follow-up, mean exodrift was 0.6 ± 9.0 PD in group 1 and 10.0 ± 7.4 PD in group 2 (p < 0.01). Exodrift up to postoperative 6 months in group 2 was 3.2 ± 4.0 PD and exodrift from postoperative 6 months to 2 years in group 2 was 7.1 ± 6.9 PD. More exodrift was noticed after post-operative 6 months (p = 0.04). CONCLUSIONS: Comparing the exodrift between the groups in moderate angle IXT, patients in the observation group showed less exodrift. Patients who had a ULR recession presented more exodrift after postoperative 6 months. Even though they were orthotropic at postoperative 6 months when the operation was thought to be stabilized, an increase in exodrift after postoperative 6 months could not be excluded.
Key Words: Exodrift;Intermittent exotropia;Lateral rectus muscle recession

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