Lyhne N, Krogsager J, Corydon L, Kjeldgaard M
Department of Ophthalmology, Vejle Hospital, Denmark.
J Cataract Refract Surg. 2000 Jan;26(1):83-7. doi: 10.1016/s0886-3350(99)00323-5.
To compare the effect of 2 contemporary sutureless cataract surgery incisions on corneal astigmatism 1 year after surgery.
Outpatient Clinic, Department of Ophthalmology, Vejle Hospital, Denmark.
Sixty-nine patients who had cataract surgery in 1997 with a 4.0 mm temporal clear corneal (n = 32) or superior scleral (n = 37) incision were examined 1 year postoperatively. Surgically induced astigmatism was analyzed by vector analysis, vector decomposition, and polar values using preoperative and postoperative keratometric readings.
Vector analysis revealed a slightly lower median induced cylinder in the clear corneal patients; 0.41 diopter (D) (95% confidence limits [CL] 0.24 to 0.67 D) versus 0.61 D (95% CL 0.49 to 0.73 D) (P < .05). Decomposition of the induced cylinder (against the rule/total) showed statistically significant differences in the direction of the cylinder; 0.21 (95% CL 0.03 to 0.41) versus 0.90 (95% CL 0.82 to 0.95) (P < .00001). The directional difference was confirmed by polar values.
Both incisions induced low and comparable amounts of astigmatism. The directional differences were modest. Findings in previous studies of a poor outcome after clear corneal incisions were not confirmed in this long-term follow-up.
比较两种当代无缝线白内障手术切口对术后1年角膜散光的影响。
丹麦韦勒医院眼科门诊。
对1997年接受白内障手术的69例患者进行术后1年检查，其中32例采用4.0mm颞侧透明角膜切口，37例采用上方巩膜切口。使用术前和术后角膜曲率计读数，通过矢量分析、矢量分解和极坐标值分析手术引起的散光。
矢量分析显示，透明角膜切口患者的诱导柱镜中位数略低；0.41屈光度（D）（95%置信区间[CL]为0.24至0.67D），而另一组为0.61D（95%CL为0.49至0.73D）（P<.05）。诱导柱镜的分解（逆规/总）显示柱镜方向存在统计学显著差异；0.21（95%CL为0.03至0.41）对0.90（95%CL为0.82至0.95）（P<.00001）。极坐标值证实了方向差异。
两种切口引起的散光量均较低且相当。方向差异不大。在本次长期随访中未证实先前研究中关于透明角膜切口预后不良的结果。
