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10 - 12 February 2017, MECC Maastricht,The Netherlands.

This Meeting has been awarded 15 CME credits.


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Corneal morphological characterization for detection of keratoconus: isolated Scheimpflug camera system vs combined Scheimpflug-placido disc topography

Poster Details

First Author: N. Moura-Coelho PORTUGAL

Co Author(s): J. Paulo Cunha   A. Luisa Basilio   C. Pereira Bruxelas   M. Dutra Medeiros   P. Candelaria        

Abstract Details


To evaluate the agreement between anterior segment parameters (ASP) as measured by isolated Scheimpflug camera topography versus combined Scheimpflug-Placido disc topography in eyes with keratoconus (KC) and KC suspects.


Centro Hospitalar Lisbon Central (CHLC, EPE)


Cross-sectional study of eyes with KC or KC suspects who underwent Sirius Scheimpflug Analyzer® and Pentacam HR® evaluation. The following ASP were measured and compared: anterior chamber depth (ACD, mm); corneal volume (CV, mm3); pachymetry at apex (AT, μm) and at thinnest point (TP, μm); keratometry (mean front K, mean back K, maximum front K, D); high-order aberrations (RMS-HOA, μm); coma (RMS-Coma, μm); spherical aberrations (RMS-SA, μm); astigmatism (RMS-Astigm, μm). Statistical analysis was performed using the IBM SPSS Statistics 19® tool.


36 eyes were studied and divided into 2 groups according to Sirius® normative database: KC suspects (G1=19 eyes) and KC (G2=17 eyes). 5 eyes of the G1 group were classified as “possible KC” by the Pentacam® system. In G1, measurements showed agreement for ACD, AT, mean front K and RMS-Coma; in G2, ACD, AT, TP, RMS-Coma and RMS-Astigm measurements showed agreement as well. The remaining ASP measured showed statistically significant differences or proportionality bias between the 2 topographers.


Combined Scheimpflug-Placido topographers may allow more precise topometric, topographic and wavefront analysis compared to Pentacam®, and may detect more cases of suspect corneas or sublinical KC. However, some of the ASP measurements didn’t show agreement and should thus not be used interchangeably.

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