Repeatability and reliability of components of the ABCD keratoconus staging system

Session Details

Session Title: Presented Poster Session: Medical Cornea

Venue: Poster Village: Pod 3

First Author: : R.Liegl GERMANY

Co Author(s): :    S. Neuhann   D. Kurse   W. Mayer   S. Priglinger   M. Shajari           

Abstract Details

Purpose:

To evaluate the components of the ABCD keratoconus staging system, namely ARC, PRC and thinnest pachymetry, as well as topometric indices, deviation of normality indices, and other commonly used parameters in terms of repeatability and reliability.

Setting:

Department of Ophthalmology, Ludwig-Maximilians-University, Munich, Germany

Methods:

317 eyes diagnosed with keratoconus were examined twice with the Pentacam. Bland Altman analysis and intraclass correlations were carried out to evaluate the parameters repeatability and reliability.

Results:

Apart from IHA (ICC = 0.730), all parameters showed excellent reliability (ICC > 0.900). ARC, PRC, thinnest pachymetry, Kmax, CKI, KI, Rmin, and Progression Avg were the best repeatable parameters with relative repeatability values < 2.5%. Other parameters that performed well in terms of repeatability were IHD, ISV, IVA, and final D (RR < 13%). Regression analysis revealed consistently high repeatability along all stages of keratoconus for PRC, thinnest pachymetry, and CKI.

Conclusions:

All parameters of the ABCD staging system showed excellent reliability and repeatability, PRC and thinnest pachymetry even at all stages of keratoconus and can be reliably used in the determination of keratoconus progression.​

Financial Disclosure:

None