J Korean Ophthalmol Soc > Volume 52(1); 2011 > Article
Journal of the Korean Ophthalmological Society 2011;52(1):67-73.
DOI: https://doi.org/10.3341/jkos.2011.52.1.67    Published online January 15, 2011.
Analysis of Effect of Inferior Oblique Myectomy in Patients With Inferior Oblique Overaction.
Joo Hyun Park, Shin Hee Kang, Dong Gyu Choi
Department of Ophthalmology, Hallym University College of Medicine, Seoul, Korea. eyechoi@dreamwiz.com
하사근기능항진 환자에서 하사근절제술의 효과 분석
Department of Ophthalmology, Hallym University College of Medicine, Seoul, Korea
To investigate the effect of inferior oblique (IO) myectomy by analyzing the correlation of the amount of inferior oblique overaction (IOOA), hypertropia and excyclotorsion before, between, and after IO myectomy in patients with various degrees of IOOA. METHODS: A total of 86 eyes from 59 patients with IOOA who underwent IO myectomy were enrolled in the present study. The correlation analysis was performed for the amount of IOOA, hypertropia and excyclotorsion before and after surgery, according to the preoperative amount of IOOA, hypertropia, and excyclotorsion. RESULTS: The IOOA decreased from +2.5 +/- 0.6 before surgery to -0.01 +/- 0.25 (p < 0.05) after surgery. The vertical deviation was 5.7 +/- 6.3 prism diopter (PD) and 2.3 +/- 5.2 PD (p < 0.05) postoperatively. The amount of cyclodeviation was 15.3 +/- 7.6degrees before surgery and 6.6 +/- 5.7degrees (p < 0.05) after surgery. The amount of surgical correction for IOOA and the hypertropia was significantly correlated with preoperative deviation (p < 0.05, p < 0.05). The amount of excyclotorsion before and after surgery was also positively correlated but was not statistically significant (p = 0.05). CONCLUSIONS: IO myectomy can correct any degree of IOOA, hypertropia, and related excyclotorsion.
Key Words: Excyclotorsion;Hypertropia;Inferior oblique myectomy;Inferior oblique overaction

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