散光人工晶状体植入术后眼内散光轴向的矢量分析

Determination of AcrySof toric intraocular lens alignment by power vector analysis method and slitlamp observation

目的比较AcrySof散光人工晶状体植入术后眼内散光轴向和裂隙灯观察散光人工晶状体的标记轴向的差别。方法对39例41只眼超声乳化白内障吸除联合AcrySof散光人工晶状体植入术患者，术后三个月进行远视力及屈光状态测定，用散光矢量分析方法计算得眼内散光轴向与用裂隙灯观察的散光人工晶状体的标记轴向进行直线相关分析。结果超声乳化白内障术后裸眼视力较术前提高（P〈0．05），眼内散光轴向与散光人工晶状体的标记轴向呈直线相关（r=0．997，P〈0．01）。结论散光矢量分析方法可以用于超声乳化术后散光人工晶状体轴向位置测定。

Objective To compare the derived intraocular astigmatism axis using power vector analysis method with the toric intraocular lens （TIOL） axis by slitlamp observation after cataract phacoemulsification. Methods A cohort of 39 patients （41 eyes） who had cataract phacoemulsification with Alcon AcrySof toric lens implantation were studied 3 months postoperatively. Postoperative refraction and keratometric cylinder were recorded. Internal astigmatism and axes was obtained using power vector analysis method to assess the TIOL axes. The intraocular astigmatism axis and the TIOL axis observed by slitlamp were compared by linear relationship. Uncorrected distance visual acuities （UDVA） and corrected distance visual acuities （CDVA） were also measured. Results Postoperatively, the eyes had UDVA better than that of preoperatively （P 〈0.05）. The difference between the 2 methods of assessing IOL axis was 4.64 ± 3.06 degrees （range 0 to 14.33 degrees）. The correlation was significant （r =0.997, P 〈0.01）. Conclusions Power vector analysis method is a suitable method for assessing toric IOL alignment.