AIM:To investigate the surgical method and extent of reoperation in the concomitant strabismus patients with surgical under-correction and over-correction. METHODS: Ninety - six concomitant strabismus patients with surgical under - correction and over -correction were recruited in this study, which included 41 males and 55 females, aged 21. 90±14. 70. All individuals underwent routine eye examinations for strabismus before the surgery. Among the cases with concomitant esotropia, there were over-correction in 23 cases, under-correction in 15 cases. Among the cases with concomitant exotropia, there were over-correction in 28 cases, under - correction in 30 cases. The method of reoperation were based on angle of deviation, the method of original operation and acute visual acuity of patients. RESULTS:In over - correction cases with concomitant esotropia, medial rectus muscle of 9 cases were advanced, the corrective extent was (5. 51±2. 63) ∆ / mm;9 cases were performed advance of medial rectus muscle and recession of lateral rectus muscle, the corrective extent was (6. 25±1. 59) ∆ / mm; 3 cases were performed resection of medial rectus muscle and recession of lateral rectus muscle, the corrective extent was (4. 26±1. 04) ∆ /mm; only 2 cases were performed recession of lateral rectus muscle, the corrective extent was (4. 21±1. 91) ∆ /mm. In under - correction cases with concomitant esotropia, 6 cases were performed resection of lateral rectus muscle, the corrective extent was (4. 03±0. 98) ∆ /mm; 6 cases were performed resection of lateral rectus muscle and recession of medial rectus muscle, the corrective extent was (6. 86 ± 1. 32) ∆ / mm; 3 cases were performed recession of medial rectus muscle, the corrective extent was ( 4. 33 ± 0. 29 ) ∆ / mm. In over -correction cases with concomitant exotropia, 16 cases were performed advance of lateral rectus muscle, the corrective extent was (5. 37 ± 1. 56) ∆ / mm; 6 cases were performed recession of medial rectus muscle, the corrective extent was (6. 29 ± 3. 68) ∆ / mm; 5 cases were performed advance of lateral rectus muscle and recession of medial rectus muscle, the corrective extent was (5. 46±1. 78) ∆ / mm; 1 case were performed resection of lateral rectus muscle, the corrective extent was 5. 00∆ / mm. In under - correction cases with concomitant exotropia, 12 cases were performed resection of medial rectus muscle, the corrective extent was (4. 47 ± 0. 54) ∆ / mm; 16 cases were performed recession of lateral rectus muscle and resection of medial rectus muscle, the corrective extent was ( 5. 11 ± 0. 75 ) ∆ / mm; 2 cases were performed recession of lateral rectus muscle, the corrective extent was (2. 65±0. 42) ∆ / mm. CONCLUSION: In reoperation of concomitant strabismus patients with over-correction, weakening or/and strengthening the horizontal muscle which were performed surgery before has a greater and more unstable surgical corrective extent. While In reoperation of concomitant strabismuspatients with under -correction, weakening or/ and strengthening the horizontal muscle which were not performed surgery has a normal corrective extent as usual.%目的：分析共同性斜视过矫或欠矫后，再次手术的术式和手术矫正量。 方法：共同性斜视术后过矫或欠矫计96例，男41例，女55例；平均年龄21.90依14.70岁。术前行斜视常规检查，共同性内斜视过矫者23例，欠矫者15例；共同性外斜视过矫者28例，欠矫者30例。术式选择主要依据斜视角的大小、远近斜视角的不同、原来的术式及双眼视力等情况而定。 结果：共同性内斜视过矫者：后徙的内直肌行前徙9例，矫正量(5.51依2.63)∆/ mm；内直肌前徙+外直肌后徙9例，矫正量(6.25依1.59)∆/ mm；内直肌截除+外直肌后徙3例，矫正量(4.26依1.04)∆/ mm；仅行外直肌后徙2例，矫正量(4.21依1.91)∆/ mm。共同性内斜视欠矫者：行外直肌截除6例，矫正量(4.03依0.98)∆/ mm；外直肌截除+内直肌后徙6例，矫正量(6.86依1.32)∆/ mm；内直肌后徙3例，矫正量(4.33依0.29)∆/ mm。共同性外斜视过矫者，行外直肌前徙16例，矫正量(5.37依1.56)∆/ mm；内直肌后徙6例，矫正量(6.29依3.68)∆/ mm；外直肌前徙+内直肌后徙5例，矫正量(5.46依1.78)∆/ mm；外直肌截除1例，矫正量5.00∆/ mm。共同性外斜视欠矫者，行内直肌截除12例，矫正量(4.47依0.54)∆/ mm；行外直肌后徙+内直肌截除16例，矫正量(5.11依0.75)∆/ mm；外直肌后徙2例，矫正量(2.65依0.42)∆/ mm。 结论：共同性内外斜视过矫者，通常对做过手术的水平肌行加强或/和减弱术，其手术矫正量偏大、且不甚稳定。欠矫者，通常对未行手术的水平肌行加强或/和减弱术，其手术矫正量同常规量。
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