J Korean Ophthalmol Soc.  2013 Mar;54(3):475-478. 10.3341/jkos.2013.54.3.475.

Comparison of Postoperative Outcomes According to Deviation Angle in Moderate-Angle Intermittent Exotropia of Basic Type

• Lee JC
• Lee YC
• Lee SY

• KMID: 2216769
• DOI: http://doi.org/10.3341/jkos.2013.54.3.475

Abstract

PURPOSE
This study was conducted to compare the surgical outcomes and stereoacuities after medial rectus (MR) muscle and lateral rectus (LR) muscle recessions, as deviation angle in 20-30 PD basic intermittent exotropia.
METHODS
A total of 72 patients were classified into three groups, according to the deviation angle and measured stereoacuities. Twenty-five patients in Group 1, with a deviation angle of 20 prism diopter (PD), underwent MR resection of 4.0 mm and LR recession of 5.0 mm. Group 2, which consisted of 26 patients with 25 PD, underwent 5.0 mm and 6.0 mm. And 21 patients in Group 3 with 30 PD underwent 5.5 mm and 7.0 mm. The success of surgery was determined by the range of a deviation angle within +/-8 PD for both near and distance.
RESULTS
The average age was 7.8 years, 7.2 years, and 8.6 years in Group 1, Group 2, and Group 3, respectively. On the final observation, the success rate of the surgery was 84%, 88%, and 90.4% in Group 1, Group 2, and Group 3, respectively. There was no case of overcorrection. Near stereoacuities was found without significant difference at preoperative with postoperative in Group 1, Group 2, and Group 3, respectively (p = 0.26). Postoperative distance stereoacuities showed significant improvements in Group 1, Group 2, and Group 3 (p = 0.04).
CONCLUSIONS
Basic intermittent exotropia, which has deviation angle of 20, 25, 30 PD showed no difference in surgical outcomes, according to the deviation angle. There were improvements in the distance stereoacuities after MR resection and LR recession procedure.

Keyword

Basic intermittent exotropia; MR resection and LR recession; Stereoacuities

MeSH Terms

Exotropia
Humans
Muscles

Reference

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