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Repeatability of wavefront aberration measurements with a dual-Scheimpflug placido corneal topographer in keratoconus

Poster Details

First Author: R.Yagci TURKEY

Co Author(s):    E. Guler   A. Kulak   M. Balci        

Abstract Details


To evaluate the repeatability of corneal wavefront aberrations using a dual Scheimpflug analyzer (Galilei, Zeimer Group) in normal and keratoconic eyes


Turgut Ozal University Hospital, Ankara, Turkey


Three repeated consecutive measurements were taken by the same examiner to assess the repeatability. The following were evaluated: The following values were recorded with a 6.0 mm pupil: individual Zernike coefficient for terms in the 3rd and 4th orders; root-mean-square (RMS) for the 3rd-, 4th-, 5th-, and 6th-orders; and total higher-order RMS. Repeatability was assessed by calculating the intraclass correlation coefficient (ICC)


The study enrolled 25 normal and 25 keratoconic subjects. In normal corneas, all measurements showed excellent ICC results ((ICC > 0.90). Regarding the keratoconic eyes, excellent ICC results (ICC > 0.90) were achieved for all measured parameters, only the exception of vertical tetrafoil, horizontal tetrafoil and RMS 6th-orders (ICC was 0.54, 0.57 and 0.48, respectively)


The repeatability of corneal aberrometric measurements with the Dual Scheimpflug - Placido system was excellent in normal eyes. Most of the aberrometric measurements also showed acceptable repeatability in keratoconus except the vertical, horizontal tetrafoil and RMS 6th-orders FINANCIAL INTEREST: NONE

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