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BioMed Research International
Volume 2014, Article ID 482093, 4 pages
Research Article

Predictive Factors Affecting the Short Term and Long Term Exodrift in Patients with Intermittent Exotropia after Bilateral Rectus Muscle Recession and Its Effect on Surgical Outcome

1Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong
2Department of Ophthalmology, Tung Wah Eastern Hospital, Hong Kong

Received 10 February 2014; Accepted 16 June 2014; Published 2 July 2014

Academic Editor: Paolo Nucci

Copyright © 2014 Jason C. S. Yam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. To determine the predictive factors that affect short term and long term postoperative drift in intermittent exotropia after bilateral lateral rectus recession and to evaluate its effect on surgical outcome. Methods. Retrospective review of 203 patients with diagnosis of intermittent exotropia, who had surgical corrections with more than 3 years of followup. Different preoperative parameters were obtained and evaluated using Pearson’s correlation analysis. Results. The proportion of exodrift increased from 62% at 6 weeks to 84% at 3 years postoperatively. The postoperative drift was  PD at 6 weeks,  PD at 6 months,  PD at 1 year,  PD at 2 years, and  PD at 3 years. Preoperative deviation and initial overcorrection were significant factors affecting the postoperative drift at 3 years ( , , , and , resp.). Conclusions. Postoperative exodrift along three years occurs in a majority of patients after bilateral lateral rectus recession for intermittent exotropia. The long term surgical success is significantly affected by this postoperative exodrift. A larger preoperative deviation and a larger initial overcorrection are associated with a larger early and late postoperative exodrift.