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Na, Suh, and Cho: The Surgical Outcome of Intermittent Exotropia with Type Conversion Subsequent to Preoperative Part-Time Occlusion Therapy
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(11): 1669-1673.

Published online: 19 November 2012

DOI: https://doi.org/10.3341/jkos.2012.53.11.1669

The Surgical Outcome of Intermittent Exotropia with Type Conversion Subsequent to Preoperative Part-Time Occlusion Therapy

Jae Hoon Na, MD, Young Woo Suh, MD, PhD, Yoon Ae Cho, MD, PhD

Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea.

Address reprint requests to Yoon Ae Cho, MD, PhD. Department of Ophthalmology, Korea University Anam Hospital, #73 Inchon-ro, Seongbuk-gu, Seoul 136-705, Korea. Tel: 82-2-920-5520, Fax: 82-2-924-6820, earth317@yahoo.co.kr

Received 6 April 2012       Accepted 8 October 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To evaluate the effects of converted intermittent exotropia type with part-time occlusion therapy on final postoperative outcomes.

Methods

The present study included 140 consecutive intermittent exotropia patients. On the patient's first visit, the type of intermittent exotropia was determined according to the deviation angle. After preoperative part-time occlusion therapy, the type of intermittent exotropia was reevaluated. The surgical success rates of each group was compared retrospectively according to the converted type.

Results

At the first visit, the basic type was the most prevalent (n = 112), followed by convergence insufficiency type (n = 18) and pseudo-divergence excess type (n = 10). Mean deviation angle on the first visit was 25.42 ± 6.05 PD at distance and 26.19 ± 8.20 PD at near. There were significant changes in near deviation angle after part-time occlusion in patients with the basic and convergence insufficiency types (p = 0.045, 0.03, respectively). Twenty-seven patients who had converted from basic type to pseudo-divergence excess type and from convergence insufficiency type to basic type showed better surgical success rate (89%) than other patients (69%) (p = 0.033).

Conclusions

Part-time occlusion therapy converts the type of intermittent exotropia by reducing near deviation angle and is related to a better surgical success rate.

Keywords: Intermittent exotropia, Part-time occlusion, Type conversion

Figures and Tables

Table 1
The changes of intermittent exotropia type after part-time occlusion therapy
jkos-53-1669-i001

Values are presented as number (%).

Table 2
Deviation angle changes after part-time occlusion therapy
jkos-53-1669-i002

Values are presented as mean ± SD.

PD = prism diopter.

Table 3
Patient characteristics of improved* and non-improved† group
jkos-53-1669-i003

Values are presented as mean ± SD or number.

*Patients who showed exotropia subtype improvement toward prognostically better type; †Patients who did not show exotropia subtype improvement toward prognostically better type.

Table 4
Success rates of improved* and non-improved† group
jkos-53-1669-i004

Values are presented as number or %.

*Patients who showed exotropia subtype improvement toward prognostically better type; †Patients who did not show exotropia subtype improvement toward prognostically better type.

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