Efficacy of corneal tomography parameters and biomechanical characteristic in keratoconus detection

Seyed Mahdi Ahmadi Hosseini, Fereshteh Abolbashari, Hamed Niyazmand, Mohammad Reza Sedaghat

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

AIM: To determine the efficacy of corneal thickness parameters and corneal biomechanical properties (CBPs) in discriminating between normal and keratoconus eyes.

METHOD: After performing a comprehensive ophthalmic examination, 50 mild to moderate keratoconus and 50 age and sex matched myopic astigmatism eyes were prospectively included in the study. The corneal topographic maps and CBP were obtained by Pentacam and Ocular response analyser, respectively. Central corneal thickness (CCT), thinnest corneal thickness (TCT), corneal thickness (CT) and percentage thickness increase (PTI) at 1, 3 and 5mm from the thinnest point and corneal volume (CV) at 3, 5, 7 and 10 centred on thinnest point, corneal hysteresis (CH) and corneal resistance factor (CRF) were recorded. Independent t-test and receiver operating characteristic (ROC) were done with SPSS software (version 15.0, SPSS, Inc.).

RESULTS: CCT, TCT, CT at 1, 3 and 5, CV at 3, 5, 7 and 10mm, CH and CRF were significantly lower in keratoconus eyes compared to controls (p<0.001). In addition, PTI at 1, 3 and 5mm from the thinnest point showed significantly higher values in keratoconus group. ROC analysis demonstrated good predictive accuracy for cut-off point values. However, the centrally located indices had higher predictive accuracy compared to the peripherally located indices.

CONCLUSION: Although good sensitivity and specificity were found for the mentioned parameters, the centrally located indices had higher predictive accuracy compared to peripherally located indices. It is suggested to use a combination of corneal pachymetry together with CBP for more accurate detection of keratoconus.

Original languageEnglish
Pages (from-to)26-30
Number of pages5
JournalContact Lens & Anterior Eye
Volume37
Issue number1
DOIs
Publication statusPublished - Feb 2014
Externally publishedYes

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Copyright © 2013 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.

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