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±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±2.63)^△/mm； 内直肌前徙+外直肌后徙9例，矫正量(6.25±1.59)^△/mm； 内直肌截除+外直肌后徙3例，矫正量(4.26±1.04)^△/mm； 仅行外直肌后徙2例，矫正量(4.21±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±0.98)^△/mm； 外直肌截除+内直肌后徙6例，矫正量(6.86±1.32)^△/mm； 内直肌后徙3例，矫正量(4.33±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±1.56)^△/mm； 内直肌后徙6例，矫正量(6.29±3.68)^△/mm； 外直肌前徙+内直肌后徙5例，矫正量(5.46±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±0.54)^△/mm； 行外直肌后徙+内直肌截除16例，矫正量(5.11±0.75)^△/mm； 外直肌后徙2例，矫正量(2.65±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。

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.