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Randomized Controlled Trial
. 2014 Oct;98(10):1409-13.
doi: 10.1136/bjophthalmol-2013-304442. Epub 2014 May 19.

Comparison of different surgery procedures for convergence insufficiency-type intermittent exotropia in children

Bing Wang  1 , Lihua Wang  1 , Qi Wang  1 , Meiyu Ren  1
Affiliations
Randomized Controlled Trial

Comparison of different surgery procedures for convergence insufficiency-type intermittent exotropia in children

Bing Wang et al. Br J Ophthalmol. 2014 Oct.

Abstract

Aims: To compare prospectively the surgical outcomes of different surgery procedures for convergence insufficiency (CI)-type intermittent exotropia (IXT) in children.

Methods: Forty-five children with CI-type IXT were included in this prospective surgical study with 6 months follow-up. According to the different surgical procedures, all children were randomly divided into three groups: the unilateral medial rectus resection (UMR) group (15 cases), the bilateral medial rectus resections (BMR) group (14 cases) and the improved unilateral recession-resection (R&R) group (16 cases). In the UMR and BMR groups, the medial rectus resection(s) were based on the distance exodeviation. In the R&R group, UMR was based on the near exodeviation while lateral rectus recession was based on the distance exodeviation. A successful surgical alignment was defined as the distant deviation in the primary gaze to be between ≤ 10 prism dioptres (PD) of exophoria/tropia and ≤ 5 PD of esophoria/tropia. The success rate, the preoperative and postoperative deviations at distance and near and near-distance differences among groups were compared.

Results: At the last follow-up of 6 months, the success rate in the R&R (87.5%) group was significantly higher than those in the UMR (13.3%) and BMR (42.9%) groups (p=0.000 and 0.008); the mean exodeviations at distance and near in the R&R group were significantly different from those in the UMR and BMR groups (p=0.000 and 0.001); there were no significant differences in the mean near-distance differences between the R&R group and the other two groups (p>0.05).

Conclusions: The improved R&R procedure in which medial rectus resection based on the near deviation with lateral rectus recession based on the distant deviation has a better alignment than the UMR and BMR surgeries for the treatment of children with CI-type IXT. All the UMR, BMR and improved R&R surgery can reduce near-distance differences in children with CI-type IXT.

Keywords: Child health (paediatrics); Muscles; Treatment Surgery.

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