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KMID : 0213520150290030173
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Korean Journal of Ophthalmology
2015 Volume.29 No. 3 p.173 ~ p.177
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Relationship between Control Grade, Stereoacuity and Surgical Success in Basic Intermittent Exotropia
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Kang Kyung-Tae
Lee Se-Youp
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Abstract
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Purpose: This study was conducted to identify the relationship between control grade, stereoacuity and surgical
success in basic intermittent exotropia.
Methods: This retrospective study involved 44 basic intermittent exotropia patients who underwent strabismus
surgery and completed at least 6 months of follow-up. The 44 patients were divided into three subgroups
according to their control grade: group 1 (good control group, n = 12), group 2 (fair control group, n = 18), and
group 3 (poor control group, n = 14). Evaluation was done to identify the relationships between near and distance
stereoacuity and control grade, and between surgical success and control grade. Surgical success was
defined as ocular alignment between 5 prism diopters esodeviation and 10 prism diopters exodeviation in the
primary position at the final visit.
Results: Mean near stereoacuity measured by the graded circle test was 57.50 seconds of arc (seconds) in
group 1, 77.77 seconds in group 2, and 131.43 seconds in group 3 (p < 0.01). Mean distance steroacuity measured
by Mentor B-VAT II BVS contour circle was 108.33 seconds in group 1, 148.33 seconds in group 2, and
262.82 seconds in group 3 (p < 0.01). Ten patients (83.33%) in group 1, 12 (66.67%) in group 2, and 9 (64.29%)
in group 3 obtained surgical success (p = 0.28).
Conclusions: In basic intermittent exotropia, better control grade was significantly accompanied by better stereoacuity.
Better control grade was accompanied by higher surgical success rate but with no statistical significance.
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KEYWORD
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Exotropia, Prevention & control, Stereoacuity, Strabismus
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