Comparison of Functional Equator-Considering and Parks Methods in Bilateral Medial Rectus Recession for Esotropia

Byung Wan Kang; Sang Woo Park; Kyung Chul Yoon; Hwan Heo

doi:10.3341/jkos.2012.53.1.138

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Kang, Park, Yoon, and Heo: Comparison of Functional Equator-Considering and Parks Methods in Bilateral Medial Rectus Recession for Esotropia

Original Article

Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(1): 138-144.

Published online: 16 January 2012

DOI: https://doi.org/10.3341/jkos.2012.53.1.138

Comparison of Functional Equator-Considering and Parks Methods in Bilateral Medial Rectus Recession for Esotropia

Byung Wan Kang, MD, Sang Woo Park, MD, PhD, Kyung Chul Yoon, MD, PhD, Hwan Heo, MD, PhD

Department of Ophthalmology, Chonnam National University Medical School, Gwangju, Korea.

Address reprint requests to Hwan Heo, MD, PhD. Department of Ophthalmology, Chonnam National University Hospital, #42 Jebong-ro, Dong-gu, Gwangju 501-757, Korea. Tel: 82-62-220-6743, Fax: 82-62-227-1642, opheye@hanmail.net

Received 6 December 2010 Accepted 8 November 2011

Abstract

Purpose

To compare the surgical outcomes of functional equator-considering and Parks' methods in infantile esotropia and partially accommodative esotropia.

Methods

The medical records of 96 patients with infantile esotropia and partially accommodative esotropia who underwent bilateral medial rectus muscle recession by functional equator-considering and Parks' methods were reviewed retrospectively. The surgery success rate at 1 month, 3 months, 6 months and 12 months was compared by the deviation angle measurement.

Results

Overall success rates were not statistically different between the 2 groups. Additionally, there were no differences in surgical success rate of functional equator-considering and Parks' methods in infantile esotropia and partially accommodative esotropia. When the patients were divided into 2 groups based on 40 PD, no significant difference in success rate between the 2 groups was observed. When patients were divided into 2 groups based on 22 mm of axial length, there was no statistical difference observed. Postoperative overcorrection was 2 (4%) in the functional equator group and 3 (6.5%) in Parks' method group and postoperative undercorrection was 9 (18%, 19.6%) in each group. The incidence of undercorrection in the Parks' method group was significantly higher in the greater than 22 mm axial length group (7, 35.0%) than in the less than 22 mm group (2, 7.7%) (p = 0.029).

Conclusions

There was no statistically significant difference in surgical success rate between the functional equator and Parks' methods in infantile esotropia and partially accommodative esotropia.

Keywords: Esotropia, Functional equator, Medial rectus recession

Figures and Tables

Table 1

Proposed surgical guideline considering functional equator

PD = prism diopters.

Table 2

Demographics and characteristics of patients with esotropia

Values are mean ± SD or number.

IE = infantile esotropia; PAE = partially accommodative esotropia; PD = prism diopters.

^*Student t-test.

Table 3

Medial rectus recession amounts according to axial length

Values are mean ± SD.

^*Student t-test.

Table 4

Surgical success rate between functional equator group and Parks method group

^*Fisher's exact test.

Table 5

Surgical success rate at 1 year between functional equator group and Parks method group in Infantile esotropia and partially accommodative esotropia

^*Fisher's exact test.

Table 6

Surgical success at 1 year after operation according to preoperative deviation

^*Fisher's exact test.

Table 7

Surgical success at 1 year after operation according to axial length

^*Fisher's exact test.

Table 8

Overcorrection at 1 year after operation according to axial length

^*Fisher's exact test.

Table 9

Undercorrection at 1 year after operation according to axial length

^*Fisher's exact test.

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