Journal List > J Korean Ophthalmol Soc > v.54(5) > 1009677

Yong-Min, Seung-Hyun, Seong-Woo, and Yoonae: The Influence of Suppression on Axial Length Progression in Intermittent Exotropia

Abstract

Purpose

To evaluate the influence of suppression by intermittent exotropia on axial length progression.

Methods

The medical records of patients with intermittent exotropia who had undergone surgery at the Korea University Medical Center from 2003 to 2010 were reviewed. The age upon visit, age at operation, visual acuity, refractive error, type of strabismus, angle of strabismic deviation, suppression test (Vectographic projector test, Reneau, France), and axial length test were analyzed. Subjects with amblyopia or anisometropia were excluded.

Results

A total of 75 patients with intermittent exotropia who had definite suppression in 1 eye were identified. The mean age at visit was 6.87 ± 2.73 years and mean angle of exodeviation was 25.65 ± 6.68 / 26.17 ± 6.59 (prism diopters, distant / near). There was no statistical difference in exotropia patients’ interocular axial length value who showed suppression in 1 eye ( p = 0.992 in the right-eye suppression group, and p = 0.528 in the left-eye suppression group).

Conclusions

In the present study, there was no statistical difference in interocular axial length value of intermittent exo-tropia patients with suppression in one eye ( p > 0.05).

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Figure 1.
Distribution of refractive errors in the study subjects.
jkos-54-766f1.tif
Table 1.
Clinical characteristics of 75 patients with intermittent exotropia
Characteristics Mean ± SD (Range)
Gender (M:F) 37:38
Suppressive eye (OD, OS) 30, 45
Mean age at onset (years) 4.57 ± 2.81 (0.75 to 14)
Mean age at visit (years) 6.87 ± 2.73 (2.67 to 16)
Mean age at surgery (years) 7.71 ± 2.75 (3.50 to 16.08)
Preoperative deviation (PD) at distance 25.65 ± 6.68 (8 to 45)
Preoperative deviation (PD) at near 26.17 ± 6.59 (10 to 45)
Disease duration (years) 3.15 ± 2.67 (0.42 to 14)
Refractive error (OD/OS) (S.E.) -0.91 ± 1.75/-0.95 ± 1.69 (OD/OS)
Axial length (OD/OS) (mm) 23.35 ± 1.13/23.34 ± 1.14 (OD/OS)
Values are presented as mean ± SD.

SD = standard deviation; PD = prism diopters; S.E. = spherical equivalent.

Table 2.
Comparison of axial length between OD suppression group* and OS suppression group
Characteristics Axial length (Mean ± SD, mm) p-value Correlation with disease duration
OD suppression group (n = 30) OD 23.57 ± 1.28 0.992 0.456§
OS 23.53 ± 1.22
OS suppression group (n = 45) OD 23.20 ± 0.99 0.528 0.537§
OS 23.22 ± 1.08

Values are presented as mean ± SD. SD = standard deviation.

* Patients who showed OD suppression on suppression test

Patients who showed OS suppression on suppression test

Wilcoxon signed rank test

§ Spearman correlation test.

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