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Comparative Study
. 2012 Jun;26(3):195-8.
doi: 10.3341/kjo.2012.26.3.195. Epub 2012 May 22.

Contemplation of the surgical normogram of lateral rectus recession for exotropia associated with superior oblique palsy

Joo-Yeon Lee  1 , Seung-Hyun Kim, Sung-Tae Yi, Tae-Eun Lee, Yoonae A Cho
Affiliations
Comparative Study

Contemplation of the surgical normogram of lateral rectus recession for exotropia associated with superior oblique palsy

Joo-Yeon Lee et al. Korean J Ophthalmol. 2012 Jun.

Abstract

Purpose: To suggest a surgical normogram for lateral rectus recession in exotropia associated with unilateral or bilateral superior oblique muscle palsy (SOP).

Methods: We retrospectively reviewed the charts of 71 patients with exotropia who were successfully corrected over one year. Each patient had undergone unilateral or bilateral rectus recession associated with uni- or bilateral inferior oblique (IO) 14 mm recession, using a modified surgical normogram for lateral rectus (LR) recession, which resulted in 1 to 2 mm of reduction of LR recession. We divided all patients into 2 groups, the 34 patients who had undergone LR recession with unilateral IO (UIO) recession group and the remaining 37 patients who had undergone LR recession with bilateral IO (BIO) recession group. Lateral incomitancy was defined when the exoangle was reduced by more than 20% compared to the primary gaze angle. The surgical effects (prism diopters [PD]/mm) of LR recession were compared between the two groups using the previous surgical normogram as a reference (Parks' normogram).

Results: The mean preoperative exodeviation was 20.4 PD in the UIO group and 26.4 PD in the BIO group. The recession amount of the lateral rectus muscle ranged from 4 to 8.5 mm in the UIO group and 5 to 9 mm in the BIO group. Lateral incomitancy was noted as 36.4% and 70.3% in both groups, respectively (p = 0.02). The effect of LR recession was 3.23 ± 0.84 PD/mm in the UIO group and 2.98 ± 0.62 PD/mm in the BIO group and there was no statistically significant difference between two the groups (p = 0.15).

Conclusions: Reduction of the LR recession by about 1 to 2 mm was successful and safe to prevent overcorrection when using on IO weakening procedure, irrespective of the laterality of SOP.

Keywords: Exotropia; Lateral rectus recession; Superior oblique palsy; Surgical normogram.

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Conflict of interest statement

No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1
Fig. 1
Flow-chart of the study design with the numbers in each group.
See this image and copyright information in PMC

References

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