Torque and flattening effects of clear corneal temporal and on-axis incisions for phacoemulsification
Torque and flattening effects of clear corneal temporal and on-axis incisions for phacoemulsification
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DOI：
10.1016/j.jcrs.2006.09.010
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发表时间：
2006-12-01
影响因子：
2.8
通讯作者：
Maurino, Vincenzo
中科院分区：
文献类型：
--
作者：
Borasio, Edmondo;Mehta, Jodhbir S.;Maurino, Vincenzo
目的：比较颞部或轴上透明角膜切口 (CCI) 进行超声乳化手术所引起的扭矩和扁平化效果。地点：英国伦敦 Moorfields 眼科医院。方法：对 62 只患有白内障和轻度至中度角膜散光（< 2.60 屈光度 [D]）的眼睛进行随机对照临床试验，使用颞部 CCl（颞部组）或轴上 CCl（轴上组）。术前和术后3周通过角膜地形图评估角膜散光。局部麻醉前在角膜上标记切口经线，以避免麻醉相关的眼球旋转。对两组的手术诱发散光 (SIA) 向量、扭矩、扁平化效果和切口放置的准确性进行分析，并与配对 t 检验进行比较。 结果：术后三周，轴上 CCl 比颞部 CCl（平均 -0.50 +/- 0.44 D）引起的切口子午线扁平化程度更高（平均 -0.63 +/- 0.57 D [SD]）；然而，差异没有统计学意义（P = .31）。简单代数差异显示，颞组散光强度平均增加 0.12 +/- 0.52 D，轴上组散光强度平均减少 0.21 +/- 0.53 D (P = .02)。平均绝对扭矩分别为 0.28 +/- 0.27 D 和 0.53 +/- 0.37 D（P
PURPOSE: To compare the torque and flattening effect induced by temporal or on-axis clear corneal incisions (CCIs) for phacoemulsification.SETTING: Moorfields Eye Hospital, London, United Kingdom.METHODS: Randomized controlled clinical trial on 62 eyes with cataract and mild to moderate corneal astigmatism (< 2.60 diopters [D]) having phacoemulsification with a temporal CCl (temporal group) or on-axis CCl (on-axis group). Corneal astigmatism was assessed by corneal topography preoperatively and 3 weeks after surgery. The meridian of the incisions was marked on the cornea before local anesthesia was given to avoid anesthesia-related cyclotorsion. The surgically induced astigmatism (SIA) vector, torque, flattening effect, and accuracy of incision placement were analyzed in the 2 groups and compared with a paired t test.RESULTS: Three weeks after surgery, the on-axis CCl induced slightly more flattening of the meridian of the incision (mean -0.63 +/- 0.57 D [SD]) than the temporal CCl (mean -0.50 +/- 0.44 D); however, the differences were not statistically significant (P = .31). Simple algebraic difference showed a mean increase in astigmatism magnitude of 0.12 +/- 0.52 D in the temporal group and a mean reduction of 0.21 +/- 0.53 D in the on-axis group (P = .02). The mean absolute torque was 0.28 +/- 0.27 D and 0.53 +/- 0.37 D, respectively (P