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Jin, Lee, and Lee: Relationship between Control Grade and Stereoacuity in Basic Intermittent Exotropia
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(1): 133-137.

Published online: 16 January 2012

DOI: https://doi.org/10.3341/jkos.2012.53.1.133

Relationship between Control Grade and Stereoacuity in Basic Intermittent Exotropia

Hyun Chul Jin, MD1, Young Chun Lee, MD2, Se Youp Lee, MD1

1Department of Ophthalmology, Dongsan Medical Center, Keimyung University College of Medicine, Daegu, Korea.

2Department of Ophthalmology, Uijeongbu St. Mary Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.

Address reprint requests to Se Youp Lee, MD. Department of Ophthalmology, Keimyung University Dongsan Medical Center, #56 Dalseong-ro, Jung-gu, Daegu 700-712, Korea. Tel: 82-53-250-7720, 7707, Fax: 82-53-250-7705, lsy3379@dsmc.or.kr

Received 28 March 2011       Accepted 18 November 2011

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

The present study was conducted to identify the correlation between control grade and stereoacuity in basic intermittent exotropia (X[T]).

Methods

Eighty-six patients with basic X (T) were divided into 3 subgroups according to their control grade and the near and distant stereoacuities were evaluated.

Results

Group 1; good control group, consisted of 28 patients, group 2; fair control, 30 patients, and group 3; poor control, 28 patients. Mean near stereoacuities measured by the Titmus test were 58.21 arcseconds in group 1, 75.33 arcseconds in group 2, and 151.43 arcseconds in group 3. The mean distant stereoacuities measured by a Mentor B-VAT® II-SG videoacuity tester were 118.93 arcseconds in group 1, 165.33 arcseconds in group 2, and 276.43 arcseconds in group 3. When comparing the 3 groups, the poorer the control grade, the worse were the near and distant stereoacuities (p = 0.002, p < 0.001). When compared in pairs, however, group 1 showed a better near stereoacuity than groups 2 and 3 (p = 0.02, p = 0.002, respectively), while group 2 and group 3 did not show any distinct differences (p = 0.13). Group 1 also showed a better distant stereoacuity than groups 2 and 3 (p = 0.02, p < 0.001, respectively), as did group 2 compared to group 3 (p < 0.001).

Conclusions

Control grade and distant stereoacuity have significant correlation in patients with basic X (T) and can function as helpful indicators for monitoring the deterioration and progression of exodeviation.

Keywords: Basic intermittent exotropia, Control grade, Stereoacuity

Figures and Tables

Table 1
Subject and subgroup demographics
jkos-53-133-i001

*SD = standard deviation; †Group 1 = good control; ‡Group 2 = fair control; §Group 3 = poor control.

Table 2
Comparison of mean visual acuity and spherical equivalent in each group
jkos-53-133-i002

*OD = Oculus dexter; †OS = Oculus sinister; ‡Group 1 = good control; §Group 2 = fair control; ∥Group 3 = poor control.

Table 3
Comparison of mean deviation angle and stereoacuity in each group
jkos-53-133-i003

*PD = prism diopters; †Group 1 = good control; ‡Group 2 = fair control; §Group 3 = poor control.

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