实时虹膜识别在波前引导LASIK术中的应用价值

目的 评价实时虹膜识别技术在波前像差引导准分子激光原位角膜磨镶术（LASIK）中的价值。方法 随机对照研究。接受实时虹膜识别联合波前引导LASIK手术的近视患者50例（100眼）作为虹膜识别组，接受常规波前引导LASIK手术的近视患者51例（102眼）作为对照组，对两组患者术后1、3、6个月的裸眼视力、屈光度、高阶像差、对比敏感度等进行比较。采用配对t检验、成组t检验、方差分析和卡方检验。结果 术后6个月时，虹膜识别组最佳矫正视力提高1行以上的患者（62眼，62.0%）多于对照组（48眼，47.1%），差异有统计学意义（x²=4.99，P＜0.05）；虹膜识别组的平均散光（-0.19±0.24）D低于对照组（-0.30±0.36）D，差异有统计学意义（t=2.49，P<0.05）。术后6个月，当瞳孔直径为6 mm时，虹膜识别组彗差、三叶草像差均方根值均小于对照组，差异均有统计学意义（t=2.22、3.31，P<0.05）。术后6个月对照组对比敏感度恢复到术前水平，而虹膜识别组略优于术前。结论 实时虹膜识别技术能够提高波前像差引导LASIK手术的视觉质量。

The practical value of first time iris recognition in wavefront aberration guided LASI

Objective To evaluate the practical value of first-time iris recognition in wavefront aberration-guided laser in situ keratomileusis (LASIK). Methods In a randomized contrast study， 101 patients (202 eyes) with myopia were randomly divided into 2 groups： the iris recognition group (50 cases， 100 eyes) that agreed to undergo first-time iris recognition combined with wavefront-guided LASIK， and the non-iris recognition group (51 cases， 102 eyes) that agreed to undergo conventional wavefront aberration-guided LASIK. Uncorrected visual acuity， refractive error， higher order aberrations and contrast sensitivity were compared between the two groups at 1 month， 3 months and 6 months postoperatively. The data were analyzed by SPSS 17.0 statistical software， a t test for the measurement data， and a chi-square test for the enumeration data. Results Six months after the operation， the number of patients who gained more than 1 line of best spectacle-corrected visual acuity (BSCVA) in the iris recognition group (62 eyes， 62.0%) was significantly more than that of the non-iris recognition group (48 eyes， 47.1%) (x²=4.99， P＜0.05). The degree of astigmatism in the iris recognition group (-0.19±0.24 D) was significantly lower than that in the non-iris recognition group (-0.30±0.36 D) (t=2.49， P＜0.05). At a 6.0 mm pupil size， there was a statistically significant difference in third-order aberration root mean square value between the iris recognition group and non-iris recognition group (t=2.22， 3.31， P＜0.05). Six months after the operation， the contrast sensitivity of the non-iris recognition group returned to their preoperative baseline. However， the iris recognition group had slightly better contrast sensitivity than their preoperative levels. Conclusion First-time iris recognition can increase visual quality in wavefront aberration-guided LASIK.