摘要目的:观察智能脉冲技术(SPT)及1 050 Hz切削频率的经上皮准分子激光角膜切削术(Trans-PRK)矫正近视散光术后对角膜形态和视觉质量的影响。方法:采用自身对照病例系列研究方法，选择2017年7月至2018年6月在成都中医大银海眼科医院行Trans-PRK手术的近视散光患者33例65眼，随访时间为6个月，记录裸眼视力(UCVA)(LogMAR)、最佳矫正视力(BCVA)(LogMAR)和等效球镜度(SE)。使用Sirius角膜地形图分析仪记录手术前后角膜前表面对称指数(SI)，6、7、8、9 mm直径范围下的角膜前表面Q值，前表面球差、彗差、三叶草和总高阶像差，斯特尔比率(SR)，水平和垂直子午线方向10、20、30、40 c/d的调制传递函数(MTF)，并比较不同时间点各指标差异。各指标相关性分析采用Pearson相关分析。结果:术前BCVA为－0.09±0.06，术后7 d、1个月、3个月、6个月UCVA分别为－0.10±0.08、－0.12±0.06、1.16±0.06、－0.18±0.05；术前SE为(－4.24±1.24)D，术后7 d、1个月、3个月、6个月SE分别为(0.03±0.63)、(0.08±0.53)、(0.02±0.79)、(0.08±0.37)D。术后不同时间点角膜前表面SI值均高于术前，差异均有统计学意义(均 P<0.05)。术后1、3个月和6个月不同直径范围的角膜前表面Q值均较术前明显增加，由负值变为正值，差异均有统计学意义(均 P<0.05)。术后各时间点角膜前表面三叶草、总高阶像差均较术前增加，术后7 d、6个月的彗差明显高于术前值，术后3个月、6个月的球差明显高于术前值，差异均有统计学意义(均 P<0.05)。术后3个月、6个月SR均较术前值明显增加，差异均有统计学意义(均 P<0.05)。术后6个月，水平子午线不同空间频率MTF值均较术前降低，垂直子午线30、40c/d空间频率MTF值较术前降低，差异均有统计学意义(均 P<0.05)。相关性分析结果显示，术后6个月不同直径范围Q值与球差( r＝0.798~0.925， P<0.05)、总高阶像差( r＝0.596~0.630， P<0.05)、SI( r＝0.235~0.303， P<0.05)、角膜切削深度( r＝0.583~0.659， P<0.05)均呈正相关；SI与球差( r＝0.307， P<0.05)、彗差( r＝0.424， P<0.05)、总高阶像差( r＝0.300， P<0.05)、角膜切削深度( r＝0.227， P<0.05)、偏心切削量( r＝0.281， P<0.05)呈正相关；SR与像差、角膜切削深度、偏心切削量等均无明显相关性(均 P≥0.05)。 结论:使用SPT的Trans-PRK术矫正近视散光术后视力提高、屈光度稳定、视网膜成像质量提升，而角膜前表面的非对称性增大，并引入不同程度的高阶像差。

abstractsObjective:To observe the corneal morphology and visual quality after transepithelial photorefractive keratectomy (Trans-PRK) with smart pulse technique (SPT) and 1 050 Hz cutting frequency in the correction of myopia and astigmatism.Methods:A self-controlled case series study was conducted.Sixty five eyes of 33 patients who underwent Trans-PRK surgery in Ineye Hospital of Chengdu University of TCM from July 2017 to June 2018 were followed up for 6 months.The uncorrected visual acuity (UCVA) converted to logarithm of the minimum angle of resolution (LogMAR) unit, best corrected visual acuity (BCVA) (LogMAR), and spherical equivalent (SE) of the subjects were recorded.The anterior corneal surface symmetry index (SI), the anterior corneal surface Q value in the range of 6, 7, 8, and 9 mm diameter, the spherical aberration, coma, trefoil and total higher-order aberration of the anterior corneal surface, the strehl ratio (SR), and the modulation transfer function (MTF) of 10, 20, 30, and 40 c/d in the horizontal and vertical meridian directions before and after surgery were measured with Sirius corneal topography analyzer.The differences of each index among different time points were compared, and the correlation between indexes was analyzed by Pearson correlation analysis.This study followed the Declaration of Helsinki.The study protocol was approved by the Medical Ethics Committee of Ineye Hospital of Chengdu University of TCM (No.2020yh-004). All patients signed the informed consent form before surgery.Results:The average preoperative BCVA and SE were -0.09±0.06 and (-4.24±1.24)D.The mean UCVA and SE at 7 days, 1, 3 and 6 months postoperatively were -0.10±0.08 and (0.03±0.63)D, -0.12±0.06 and (0.08±0.53)D, 1.16±0.06 and (0.02±0.79)D, -0.18±0.05 and (0.08±0.37)D, respectively.The SI at different time points after the surgery were significantly higher than that before operation (all at P<0.05). At 1, 3 and 6 months after surgery, the Q value of anterior corneal surface in different diameter ranges increased from negative to positive, showing statistically significant differences (all at P<0.05). At each time point after surgery, the trefoil and total higher-order aberrations of the anterior corneal surface increased to varying degrees.Coma at 7 days and 6 months after surgery were significantly higher than that before surgery, and spherical aberration at 3 and 6 months after surgery were significantly higher than that before surgery (all at P<0.05). The SR values at 3 and 6 months after operation were significantly higher than that before operation (all at P<0.05). At 6 months after operation, the MTF values at different spatial frequencies of the horizontal meridian and the MTF values at 30 and 40c/d spatial frequencies of the vertical meridian were lower than those before operation, and the differences were statistically significant (all at P<0.05). The correlation analysis showed that the Q value of different diameter ranges was positively correlated with spherical aberration ( r=0.798-0.925, P<0.05), total higher-order aberration ( r=0.596-0.630, P<0.05), SI ( r=0.235-0.303, P<0.05) and corneal ablation depth ( r=0.583-0.659, P<0.05) at 6 months after surgery.SI was positively correlated with spherical aberration ( r=0.307, P<0.05), coma ( r=0.424, P<0.05), total higher-order aberration ( r=0.300, P<0.05), corneal ablation depth ( r=0.227, P<0.05), and eccentric cutting amount ( r=0.281, P<0.05). There was no correlation between SR and aberration, corneal ablation depth, eccentric cutting amount, etc.(all at P≥0.05). Conclusions:Trans-PRK using SPT to correct myopic astigmatism can improve vision, stabilize diopter, enhance retinal imaging quality, increase the asymmetry of the anterior corneal surface, and introduce different degrees of higher-order aberrations.