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외사시 환자에서 사시각에 따른 단안 혹은 양안 외직근 후전술 후 사시각 변화와 편차의 비교
황규연,이세엽,이영춘,Kyu Yeon Hwang,Se Yup Lee,Young Chun Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.1
Purpose: To compare the changes in strabismus angle and deviation between two groups: a bilateral lateral rectus recession (Group 1) and a unilateral lateral rectus recession in exotropia (Group 2). Methods: A retrospective survey was conducted on 198 patients who had received exotropia surgery in our ophthalmology clinic from September 2003 to April 2007. A total of 116 patients were in Group 1, and 82 patients were in Group 2. Unilateral lateral rectus recession was performed on patients under 25 PD, and bilateral lateral rectus recession was performed on patients above 25 PD. A case of less than 4 PD esodeviation and less than 10 PD exodeviaton was defined as a success and any other case as a failure at the 1-year follow-up visit. Results: The average deviations of the first postoperative month and the first postoperative year were -1.96 D ± 4.75, 2.5 D ± 7.82 for Group 1 and 0.77 D ± 2.87, 5.94 D ± 3.38 for Group 2. Revealing statistical significance between the 2 Groups: Group 1 had 30 failure cases (25.9%) and their 1 postoperative year average deviation was 5.42 D ± 13.97, while Group 2 showed 24 failure cases (29.3%) and their 1-postoperative-year average deviation was 13.0-79 ± 3.04. Group 1 had less strabismus angle and a greater standard deviation than Group 2, as Group 1 had more overcorrection. Among the 30 failure cases of Group 1, 9 were overcorrected and 21 were undercorrected, but all 24 failure cases in Group 2 were undercorrected. Conclusions: The strabismus angle after lateral rectus recession showed a wider variation and a larger difference in bilateral lateral rectus recession than in the unilateral lateral rectus recession. J Korean Ophthalmol Soc 2011;52(1):60-66
구희찬,박영근,이세엽,이영춘,Hee Chan Ku,Young Gun Park,Se Yup Lee,Young Chun Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.8
Purpose: To experimentally investigate the effect for muscle weakness after superior rectus Z-myotomy and histological changes. Methods: Superior rectus muscle fibers of rabbits (16 rabbits, 32 eyes) were cut transversely with scissors across 75% of the muscle in two different positions on opposite sides. In group 1 (16 eyes), myotomies were performed at 2 and 7 mm from the muscle insertion (5 mm gap) and in group 2, performed at 2 and 5 mm (3 mm gap). The change of mark, eyeball position, and muscle tension after myotomy and 4 weeks postoperatively was evaluated, the location of the mark was examined, and muscle tissue biopsy was performed. Results: After Z-myotomy, the marks of the two groups moved significantly posteriorly from insertion within groups (p<0.05), with no significant differences between groups (p=0.469). Eyeball positions of the two groups moved significantly inferiorly (p<0.05); the amount of position change of group 1 was greater than group 2 (p<0.05). When the globe was pulled in opposite directions for muscle action, the degree of change decreased with significant difference within groups (p<0.05), but there were no significant differences between groups (p=0.32). Conclusions: Z-myotomy of the superior rectus muscle affected the recession of eyeball position and weakened the muscle action. Muscle weakening affected by the different gaps between myotomies did not show consistent results. J Korean Ophthalmol Soc 2010;51(8):1121-1128