J Korean Ophthalmol Soc > Volume 55(4); 2014 > Article
Journal of the Korean Ophthalmological Society 2014;55(4):585-589.
DOI: https://doi.org/10.3341/jkos.2014.55.4.585    Published online April 15, 2014.
The Effects of Part-Time Occlusion Therapy Shortened to One or Two Hours in Intermittent Exotropia.
Kyung Ho Lee, Young Woo Suh, Yoon Ae Cho
Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea. anameye@gmail.com
간헐외사시에서 1시간 또는 2시간으로 단축한 눈가림의 효과
이경호⋅서영우⋅조윤애
Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea
Abstract
PURPOSE
To evaluate the compliance level of therapy and the change in exo-angle after 1 or 2 hours of part-time occlusion therapy in intermittent exotropia. METHODS: This retrospective study included 97 patients with intermittent exotropia who were followed-up for more than 6 months after their initial visit. We evaluated the exo-angle and prescribed either 1 hour or 2 hours of part-time occlusion therapy for the fixating eye. After 6 months, the exo-angle was reevaluated and compliance was examined. Patients were divided into 2 groups according to the occlusion therapy time: the 1-hour patching group (33 patients) and the 2-hour patching group (64 patients). Compliance and deviation angle were retrospectively reviewed and compared between the 2 groups. We evaluated the exo-angle of patients with compliance over 50% (1-hour patching group (31 patients), 2-hour patching group (51 patients)). RESULTS: The mean exo-angles on the first visit were 22.61 +/- 5.78 PD (prism diopters) at distance and 22.88 +/- 8.11 PD at close-range in the 1-hour patching group, and 26.17 +/- 4.55 PD at distance and 25.27 +/- 8.54 PD at close-range in the 2-hour patching group. The proportion of patients with compliance over 50% was higher in the 1-hour patching group (93.94%) than in the 2-hour patching group (79.69%, p = 0.013). There were significant decreases in distant and close- range deviation angles after part-time occlusion in patients with compliance over 50% in both groups (1-hour patching group distant p = 0.042, close-range p = 0.002; 2-hour patching group distant p < 0.001, close-range p < 0.001). The magnitude of deviation angle decrease was not statistically significant between the 2 groups (ANCOVA; distant p = 0.461, near p = 0.761). CONCLUSIONS: One or 2 hours of part-time occlusion therapy in intermittent exotropia provided beneficial effects, including decreasing the deviation angle. The magnitude of deviation angle decrease, however, was not different between the 2 times of therapy. Compliance was higher in the 1-hour part-time occlusion therapy group. Therefore, 1-hour part-time occlusion therapy could be effective in patients with poor cooperation.
Key Words: Compliance;Intermittent exotropia;Part-time occlusion therapy


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