목적 : 하사근기능항진이 있는 환자에서 하사근약화술 후 안구의 회선 변화를 알아보고자 하였다. 대상과 방법 : 상사근마비에 의한 하사근기능항진 11명 12안, 일차 하사근기능항진만을 보인 9명 16안, 총 28안을 대상으로 단계적인 하사근후전술을 동반한 전치술을 시행하여 이들 수술이 안구의 외회선에 미치는 영향을 알아보기 위하여 안저사진을 촬영하였다. 결과 : 전체 환자의 외회선 각도는 술전 평균 +17.5o에서 술후 +6.4o로 감소하여 교정량은 11.1o였다. 상사근마비 환자의 경우는 평균 +19.1o에서 +6.5o로 12.6o 교정되었으며, 일차 하사근기능항진 환자의 경우는 평균 +16.3o에서 +6.3o로 10o 교정되었다(p<0.05). 결론 : 하사근기능항진 환자에서 하사근후전술을 동반한 전치술 후 약 11o의 외회선 교정효과를 볼 수 있었다.

Purpose: To examine changes in ocular torsion after the weakening procedure for the inferior oblique muscle in patients with overaction of inferior oblique muscle (IOOA). Methods: Twenty-eight eyes that had undergone the graded IO anteriorization combined with recession were evaluated. Twelve eyes from 11 patients had IOOA due to superior oblique muscle palsy (SOP) and 16 eyes from 9 patients had primary IOOA. Fundus photograph was taken to examine changes in torsional deviation before and after surgery. Results: The average torsional deviation decreased from +17.5±7.3o before surgery to +6.4±5.8o after surgery, with the amount of correction being 11.1o. It was corrected by 12.6, from +19.1±7.7o to +6.5±4.8o, in patients with SOP, and by 10o, from +16.3±6.9o to +6.3±6.6o, in patients with IOOA (p<0.05). Conclusions: About 11o excyclotorsional correction was observed in patients with IOOA after IO anteriorization combined with recession.

Purpose: To examine changes in ocular torsion after the weakening procedure for the inferior oblique muscle in patients with overaction of inferior oblique muscle (IOOA). Methods: Twenty-eight eyes that had undergone the graded IO anteriorization combined with recession were evaluated. Twelve eyes from 11 patients had IOOA due to superior oblique muscle palsy (SOP) and 16 eyes from 9 patients had primary IOOA. Fundus photograph was taken to examine changes in torsional deviation before and after surgery. Results: The average torsional deviation decreased from +17.5±7.3o before surgery to +6.4±5.8o after surgery, with the amount of correction being 11.1o. It was corrected by 12.6, from +19.1±7.7o to +6.5±4.8o, in patients with SOP, and by 10o, from +16.3±6.9o to +6.3±6.6o, in patients with IOOA (p<0.05). Conclusions: About 11o excyclotorsional correction was observed in patients with IOOA after IO anteriorization combined with recession.

Graded inferior oblique muscle anteriorization combined with recession, Overaction of Inferior oblique muscle, Torsional deviation