Kitthaweesin Kitthisak, Singhakul Sansanee
Department of Ophthalmology, Faculty of Medicine, Khon Kaen University, Thailand.
J Med Assoc Thai. 2007 Apr;90(4):744-7.
To investigate the effect of horizontal rectus muscle surgery on astigmatism.
A prospective descriptive study was conducted between July 2004 and June 2005, we recruited 16 strabismic patients with bilateral recession or recession of one horizontal muscle or monocular recession and resection for this study at Srinagarind Hospital. The authors measured the patients' best-corrected visual acuity and ocular alignment using the prism cover test and the Modified Krimsky tests, respectively. Auto-refraction was performed on the pre- operative and first post operative day by a technician not apprised of the type and/or amount of surgery. Any differences between the pre-operative and post operative astigmatism were calculated using the x-y coordinate system and the mean value for astigmatism. Descriptive statistics were used to analyze the data.
Included were 23 eyes from 16 patients who met the inclusion criteria; 8 females; 8 males; average age 14.75 +/- 11.76 (range, 4-40) years. Seven patients (43.75%) had esotropia and nine (56.25%) exotropia. For all procedures, the respective mean cylinder of the pre- operative and first post-operative day were 0.74 +/- 1.20 D in 67.56 degrees axis and 0.69 +/- 0.86 D in 56.30 degrees axis, in the same direction as the cylinders for each type. There was no statistically significant change in the refractive error between the pre- operative and first postoperative day.
In contrast to previous studies, astigmatism was not significantly affected by horizontal rectus muscle surgery; however, the present study population was small. Therefore, a larger prospective control trial would be necessary to definitively answer this question.
研究水平直肌手术对散光的影响。
2004年7月至2005年6月进行了一项前瞻性描述性研究，我们在诗里拉吉医院招募了16例患有双侧内直肌后徙术、单条水平肌后徙术或单眼后徙和切除术的斜视患者进行本研究。作者分别使用棱镜遮盖试验和改良克里姆斯基试验测量患者的最佳矫正视力和眼位。由一名不了解手术类型和/或手术量的技术人员在术前和术后第一天进行自动验光。使用x - y坐标系和散光平均值计算术前和术后散光的任何差异。采用描述性统计分析数据。
纳入符合纳入标准的16例患者的23只眼；8例女性；8例男性；平均年龄14.75±11.76（范围4 - 40）岁。7例患者（43.75%）患有内斜视，9例（56.25%）患有外斜视。对于所有手术，术前和术后第一天各自的平均柱镜度数分别为67.56度轴向上0.74±1.20 D和56.30度轴向上0.69±0.86 D，与每种类型的柱镜方向相同。术前和术后第一天屈光不正无统计学显著变化。
与先前研究相反，水平直肌手术对散光无显著影响；然而，本研究的样本量较小。因此，需要进行更大规模的前瞻性对照试验来明确回答这个问题。
