Official ESCRS | European Society of Cataract & Refractive Surgeons


Comparison of anterior corneal curvature and astigmatism parameters provided by three different devices

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Session Details

Session Title: Anterior Segment Imaging

Session Date/Time: Monday 16/09/2019 | 14:00-16:00

Paper Time: 15:12

Venue: Free Paper Forum: Podium 4

First Author: : A.Molina-Martín SPAIN

Co Author(s): :    D. Piñero   M. Caballero   V. Camps   D. de Fez   H. Fukumitsu                 

Abstract Details


To compare the corneal curvature and astigmatism measurements provided by three different systems and to assess the interchangeability between them in healthy eyes.


Department of Optics, Pharmacology and Anatomy, University of Alicante, Spain Department of Ophthalmology. Vithas Medimar International Hospital, Alicante, Spain


A total of 28 healthy eyes of 28 patients (age, 15-53 years) were enrolled. A complete eye examination was performed in all cases including analysis of anterior corneal curvature and astigmatism with three devices: the Cassini system (i-Optics), the Scheimpflug-based system Pentacam (Oculus Optikgeräte), and the IOL Master 500 (Zeiss). Differences between devices were assessed by means of Wilcoxon Test. The Bland & Altman analysis was used to evaluate the agreement between devices.


Statistically significant differences were found in Mean k, Steep k, and Flat k between the three devices (p < 0.001). No significant differences between devices were found in Astigmatism (magnitude) and J0 power vector (p=0.054 and p=0.156, respectively). In contrast, statistically significant differences between devices were found for J45 (p=0.022). Bland-Altman plots showed clinically relevant differences between devices for all studied parameters.


The three devices evaluated did not provide interchangeable measurements of anterior corneal curvature. These results should be considered when considering data for calculating intraocular lens power.

Financial Disclosure:

travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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