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Accuracy of standard K-readings compared to new Total Keratometry Mesasurement using posterior cornea surface curvature for toric IOL power calculations

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Session Details

Session Title: Vision & Accommodation Assessment

Session Date/Time: Monday 24/09/2018 | 14:00-16:00

Paper Time: 14:24

Venue: Room A3, Podium 2

First Author: : E.Fabian GERMANY

Co Author(s): :                        

Abstract Details


This year we present final data after incorporating 145 eyes in this study. We compared post-operative refractive outcomes of toric IOL calculation based on measured anterior and posterior corneal surface curvature. Total Keratometry (TK) of the IOLMaster 700 to classic methods using telecentric one-zone (1z) keratometry as well as telecentric 3-zone (3z) keratometry of the IOLMaster 700, accounting for anterior corneal curvature only were used.


AugenCentrum Rosenheim, Germany. Maxiklinik Nürnberg, Germany


IOL power calculation (Haigis-T), cataract surgery and IOL-Implantation (ZEISS CT Asphina 409M) were performed in 145 eyes using the clinic’s standard pre-, intra- and post-operative clinical procedures. Cylinder (cyl) and spherical equivalent (SEQ) post-op refractive outcome was assessed by manifest refraction at a minimum of 6 week after surgery. Additionally, raw data were collected using an export function available in the device software (IOLMaster 700) pre- and at least 8 weeks post-surgery. Internal prototype software (Carl Zeiss Meditec AG) was applied to generate TK power values from pre- and post-surgical data including anterior and posterior surfaces of the cornea.


Results present preliminary prediction errors for 145 cases. Mean absolute Haigis-T error for SEQ with 1z keratometry, with 3z keratometry and with TK will be presented as well as mean absolute error of CYL


The IOLMaster 700 Total Keratometry (TK) values, based on anterior and posterior corneal surface curvatures, show favourable results for CYL and SEQ outcome performance when compared to classic anterior corneal surface keratometry.

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