Related Experiment Video
Updated: Nov 11, 2025
Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
Total keratometry for determination of true corneal power after myopic small-incision lenticule extraction
Roman Lischke1, Wolfgang J Mayer, Nikolaus Feucht
1From 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).
Purpose:
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.
Setting:
Department of Ophthalmology, Ludwig-Maximilians-University, and SMILE Eyes Clinic Munich Airport, Munich, Germany.
Design:
Prospective cross-sectional trial.
Methods:
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).
Results:
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).
Conclusions:
The findings endorse TK as an accurate measure for corneal power after myopic SMILE.
