Journal List > J Korean Ophthalmol Soc > v.50(7) > 1008316

J Korean Ophthalmol Soc. 2009 Jul;50(7):1093-1097. Korean.
Published online July 24, 2009.
Copyright © 2009 The Korean Ophthalmological Society
The Effect of Medial Rectus Resection in Reccurent Exotropia After Lateral Rectus Recession
Won Kyung Cho, MD,1 Se Yup Lee, MD,2 and Young Chun Lee, MD1
1Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2Department of Ophthalmology, Keimyung University School of Medicine, Daegu, Korea.

Address reprint requests to Young Chun Lee, MD. Department of Ophthalmology, Uijongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, #65-1 Keumo-dong, Uijeongbu 480-717, Korea. Tel: 82-31-820-3116, Fax: 82-31-847-3418, Email:
Received November 10, 2008; Accepted May 06, 2009.



To investigate the effect of unilateral medial rectus resection in recurrent exotropia under 25 Prism Diopter after unilateral or bilateral lateral rectus recession.


A retrospective chart analysis was conducted for 21 patients who underwent unilateral medial rectus resection for recurrent exotropia under 25PD and uni- or bilateral lateral rectus recession for prior surgery of exotropia. The medial rectus was resected from 5.0 to 7.0 mm by 0.5 mm according to angle deviation at a distance. The postoperative deviated angle was checked at one week, three months and six months postoperatively to investigate the amount of corrected deviation per resected muscle.


The average preoperative deviation was 20.57±3.37PD. We resected mean 6.1±0.62 mm of the medial rectus. At one week after the surgery, the postoperative deviated angle was 2.00±4.32PD, After six months it was 6.57±7.40PD, and there appeared to be an increase of deviation. Ten patients (48%) fused before surgery and 12 (57%) after surgery. The corrected deviation per resected muscle was 2.88±1.08PD.


Unilateral medial rectus resection is an effective surgical method for the treatment of recurrent exotropia under 25 PD after lateral rectus recession.

Keywords: Lateral rectus recession; Recurrent exotropia; Unilateral medial rectus resection


Table 1
Age and sex distribution at the first and second operation
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Table 2
Sensory status of Worth 4 Dot at near
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Table 3
Pre- and postoperative angle deviation at the first and second operation and the amount of rectus muscle recession or resection
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Table 4
Corrected prism diopter per resected medial rectus according to deviated angle
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Table 5
Amount of MR resection according to angle deviation and postoperative deviations
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