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Effect of horizontal rectus surgery for the correction of intermittent exotropia on sub-A or sub-V pattern

Title
Effect of horizontal rectus surgery for the correction of intermittent exotropia on sub-A or sub-V pattern
Authors
Lee, Young BokRhiu, SoolienahLee, Joo YeonChoi, Mi YoungPaik, Hae JungLim, Key HwanChoi, Dong Gyu
Ewha Authors
임기환
SCOPUS Author ID
임기환scopus
Issue Date
2017
Journal Title
PLOS ONE
ISSN
1932-6203JCR Link
Citation
PLOS ONE vol. 12, no. 6
Publisher
PUBLIC LIBRARY SCIENCE
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We evaluated effect of horizontal rectus surgery on sub-A or sub-V pattern intermittent exotropia. We enrolled patients with sub-A or sub-V pattern intermittent exotropia. The sub-A pattern was diagnosed when the eyes diverged less than 10 prism diopters (PD) from upgaze to downgaze, and sub-V pattern when the divergence was 14 PD or less from downgaze to upgaze. Patients had undergone horizontal rectus surgery without vertical transposition of horizontal rectus muscle or oblique muscle weakening. The patients were divided into two groups: sub-A pattern (group A) and sub-V pattern (group V). The outcome measures were change of amount of pattern and rate of collapse of pattern postoperatively. The amount of pattern (vertical incomitance) was amount of difference in exodeviation between upgaze and downgaze. Collapse of pattern was defined as disappearance of difference in exodeviation between upgaze and downgaze. In groups A and V, preoperative amounts of pattern were 4.9 PD and 6.8 PD, respectively. A significant reduction in amount of pattern was observed in both groups throughout the follow-up period (p<0.05). At postoperative 6 months, the amounts of pattern were 1.0 PD and 1.2 PD and the extents of reduction in amount of pattern were 4.4 PD and 5.9 PD. The rates of collapse of pattern at postoperative 6 months were 77.8 and 60.0%, respectively. In the patients with sub-A or sub-V pattern exotropia, horizontal rectus surgery without vertical transposition or oblique muscle weakening can successfully collapse the pattern.
DOI
10.1371/journal.pone.0179626
Appears in Collections:
의과대학 > 의학과 > Journal papers
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