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Reproducibility, repeatability and agreement of corneal topography measured by Revo NX, Galilei G6 and Casia 2

Poster Details

First Author: A.Wylegala POLAND

Co Author(s):    R. Mazur   B. Bolek   E. Wylęgała              

Abstract Details


To test repeatability and reproducibility of spectral domain optical coherence tomography (OCT) Revo Nx (new device) and to compare keratometry values obtained by a Scheimpflug tomography (Galilei G6)  and a swept source OCT (Casia 2).


Ophthalmology Department Railway Hospital Katowice Panewnicka 65. 40765- Katowice, Poland II School of Medicine with the Division of Dentistry in Zabrze Medical University of Silesia, Katowice


Methods: Healthy subjects who had central corneal thickness (CCT), anterior and posterior K1/K2  keratometry measured with the new device and the reference keratometers were included in the study. Two operators made 10 measurements on the new device to check repeatability.  Bland-Altman plots were used to assess the agreement between the devices for each analyzed variable.


Results: 94 eyes (94 patients) were studied.  All devices produced significantly different mean CCT, with the highest for Galilei 569.13±37.58  followed by the Casia 545.00 ±36.15 and Revo 537.39±35.92 µm.  The mean average anterior keratometry was 43.68±1.35 for Casia 2 42.91±1.50 for Revo Nx and 43.65±1.34 and it was insignificant for Casia 2 and Galilei G6 p=0.22. The mean average posterior keratometry for Revo Nx was -5.89 ± 0.22  while for Casia 2 it was -6.14±0.22 and for Galilei G6 -6.33±0.34 D.


The RevoNX offered high repeatability of 0.975 for posterior surface to 0.994 for anterior and reproducibility for the anterior and posterior cornea and was independent of a user.

Financial Disclosure:

... research is funded, fully or partially, by a competing company

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