From the University Eye Hospital, Ludwig-Maximilians-University, Munich, Germany (Lischke, Mayer, Siedlecki, Priglinger, Luft); SMILE Eyes Clinic, Linz, Austria (Siedlecki, Priglinger, Luft); SMILE Eyes Clinic, Munich, Germany (Feucht, Wiltfang); Prof. Kook & Partner, Private Practice, Graefelfing, Germany (Kook).
J Cataract Refract Surg. 2021 Oct 1;47(10):1285-1289. doi: 10.1097/j.jcrs.0000000000000630.
To gauge the value of total keratometry (TK) to estimate corneal power change in eyes that underwent small-incision lenticule extraction (SMILE) for treatment of myopia or myopic astigmatism.
Department of Ophthalmology, Ludwig-Maximilians-University, and SMILE Eyes Clinic Munich Airport, Munich, Germany.
Prospective cross-sectional trial.
A total of 40 eyes of 40 patients who had undergone myopic SMILE were enrolled in this prospective study. Total corneal refractive power (TCRP; Pentacam HR) and TK (IOLMaster 700, Carl Zeiss Meditec AG) values were compared with the clinical history method (CHM). The surgically induced changes in TCRP (ΔTCRP) and TK (ΔTK) were also compared with the changes in spherical equivalent on the corneal plane (ΔSEco).
Of the 40 eyes analyzed, the correlation between TK and CHM (R2 = 0.91, P < .001) was stronger than that between TCRP and CHM (R2 = 0.87, P < .001). When compared with the CHM, TCRP underestimated corneal power by a mean relative error of 0.59 diopter (D) and TK by 0.17 D. Linear regression analysis of ΔTCRP/ΔTK and the difference between preoperative and postoperative manifest refraction spherical equivalent at the corneal plane (ΔSEco) showed stronger correlation in ΔTK (R2 = 0.88) than that in ΔTCRP (R2 = 0.82).
The findings endorse TK as an accurate measure for corneal power after myopic SMILE.
评估总角膜曲率（TK）在接受小切口透镜切除术（SMILE）治疗近视或近视散光的眼中估计角膜屈光力变化的价值。
德国慕尼黑路德维希-马克西米利安大学眼科和 SMILE 慕尼黑机场眼科诊所。
前瞻性横断面试验。
本前瞻性研究纳入了 40 例 40 只眼接受近视 SMILE 的患者。比较了总角膜屈光力（Pentacam HR）和 TK（卡尔蔡司医学技术公司的 IOLMaster 700）值与临床病史法（CHM）。还比较了 TCRP（ΔTCRP）和 TK（ΔTK）的手术诱导变化与角膜平面等效球镜变化（ΔSEco）。
在分析的 40 只眼中，TK 与 CHM（R2 = 0.91，P <.001）的相关性强于 TCRP 与 CHM（R2 = 0.87，P <.001）。与 CHM 相比，TCRP 平均低估了角膜屈光力 0.59 屈光度（D），TK 低估了 0.17 D。ΔTCRP/ΔTK 与角膜平面术前和术后表现折射等效球镜之间差异（ΔSEco）的线性回归分析显示，ΔTK 的相关性更强（R2 = 0.88），而不是 ΔTCRP（R2 = 0.82）。
这些发现支持 TK 作为近视 SMILE 后角膜屈光力的准确测量方法。
