目的：定量分级评估单眼外斜的眼球后退综合征Ⅲ型患者双眼外直肌非对称量后徙术的疗效。

方法：回顾性病例资料统计分析。回顾性分析12例单眼外斜的眼球后退综合征Ⅲ型患者的临床资料。所有病例内转受限，内转时睑裂缩小，伴有上下射，外转受限伴外转时睑裂开大。所有患者均有异常头位。保持头正位情况下测量双眼分别注视的斜视度。手术设计选择双眼外直肌非对称量后徙术，患眼外直肌后徙量小且同时行Y形劈开，健眼外直肌后徙量大，根据患眼注视斜视度设计或较患眼多1～3mm。

结果：手术前后健眼注视斜视度比较有差异(Z=-4.158，P<0.01)； 手术前后内转受限程度比较有差异(Z=-2.640，P=0.008)； 手术前后外转受限程度比较无差异(Z=-1.732，P=0.083)； 手术前后异常头位角度比较有差异(Z=-4.181，P<0.01)； 手术前后眼球后退程度比较无差异(Z=-1.414，P=0.157)； 手术前后眼球上下射程度比较有差异(Z=-3.115，P=0.002)； 术前有10例(83%)患者存在立体视功能，术后有11例(92%)患者恢复立体视功能，并且50%患者立体视锐度进一步提升。

结论：双眼外直肌非对称量后徙术联合患眼外直肌Y形劈开可有效改善单眼外斜的眼球后退综合征Ⅲ型患者的斜视度、异常头位角度、上下射现象以及立体视锐度，并且不加重患眼外转受限及眼球后退程度。

METHOD:Retrospective analysis of clinical data. The clinical data of 12 cases of type III Duane retraction syndrome with unilateral lateral rectus recession were analyzed. All subjects had restricted internal rotation, with narrowing of the palpebral fissure and vertical deviation, and restricted external rotation with widening of the palpebral fissure. All patients had abnormal head positions. The degree of strabismus was measured while maintaining the head in a neutral position. Asymmetric recession of bilateral lateral rectus was selected based on the degree of strabismus of affected eye or 1～3mm longer, with a smaller recession and Y-splitting in the affected eye and a larger recession in the healthy eye.

RESULT:The difference in the degree of strabismus in the healthy eyes before and after surgery was statistically significant(Z=-4.158, P<0.01), as was the difference in the degree of restricted internal rotation(Z=-2.640, P=0.008). The difference in the degree of restricted external rotation was not statistically significant(Z=-1.732, P=0.083). The difference in abnormal head position was statistically significant(Z=-4.181, P<0.01), while the difference in eyeball recession was not statistically significant(Z=-1.414, P=0.157). The difference in vertical deviation was statistically significant(Z=-3.115, P=0.002). A total of 10 patients(83%)had stereoscopic vision before surgery, and 11 patients(92%)had recovered stereoscopic vision after surgery, with a further improvement in stereoacuity in 50% of patients.

CONCLUSION:Asymmetric recession of bilateral lateral rectus combined with Y-splitting of the affected lateral rectus can effectively improve the degree of strabismus, abnormal head position, vertical deviation and stereoacuity without aggravating the degree of restriction of external rotation or eyeball recession.