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Quantitative measurement of passive duction force tension in intermittent exotropia and its clinical implications

Authors
 Hyunkyoo Kang  ;  Shin-Hyo Lee  ;  Chung-Sik Oh  ;  Hyun Jin Shin  ;  Andrew G Lee 
Citation
 GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY, Vol.259(6) : 1617-1623, 2021-06 
Journal Title
GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
ISSN
 0721-832X 
Issue Date
2021-06
MeSH
Case-Control Studies ; Exotropia* / surgery ; Humans ; Oculomotor Muscles / surgery ; Prospective Studies ; Strabismus*
Keywords
Exotropia ; Extraocular muscles ; Passive duction force ; Quantitative measurement ; Tension
Abstract
Purpose: To evaluate the passive duction force (PDF) in extraocular muscles (EOMs) in patients with intermittent exotropia (IXT) using a quantitative tension-measuring device.

Methods: This prospective, case-control study enrolled 25 patients with IXT and 26 age- and sex-matched controls. PDF was measured under general anesthesia as the eyeball was rotated medially or laterally away from the direction of the force being tested. The preferred eye for fixation was determined using a cover-uncover test.

Results: The PDF in the IXT and control groups were 60.9 g and 52.1 g, respectively, for the lateral rectus (LR) (p = 0.046) and 53.0 g and 48.8 g for the medial rectus (MR) (p = 0.293). When the eyes were examined separately in the IXT group, the PDF of LR was larger in the nonpreferred eye for fixation than in the control group (p = 0.039), whereas there was no difference in the preferred eye for fixation (p = 0.216). Additionally, the relative PDF of LR in the nonpreferred eye compared to the ipsilateral PDF of MR was positively associated with the duration of manifest deviation (p = 0.042) and the average angle of the near and far deviations (p = 0.023).

Conclusions: The PDF in the LR in patients with IXT in the nonpreferred eye for fixation was larger than normal and could increase with the duration of manifest deviation and the angle of deviation. Evaluating the PDF in EOMs could provide information that is useful for managing strabismus and understanding its pathophysiology.
Full Text
https://link.springer.com/article/10.1007/s00417-020-05030-x
DOI
10.1007/s00417-020-05030-x
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Anatomy (해부학교실) > 1. Journal Papers
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/190881
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