title: Efficacy of corneal tomography parameters and biomechanical characteristic in keratoconus detection.
abstract: OBJECTIVE
  To determine the efficacy of corneal thickness parameters and corneal biomechanical properties (CBPs) in discriminating between normal and keratoconus eyes.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Ophthalmology, Mashhad Medical University, Mashhad, Iran. Electronic address: Mahdi.ahmadihosseini@yahoo.com.
authors.forename: Seyed Mahdi
authors.initials: SM
authors.lastname: Ahmadi Hosseini
authors.affiliation: Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Ophthalmology, Mashhad Medical University, Mashhad, Iran.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Abolbashari
authors.affiliation: Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Ophthalmology, Mashhad Medical University, Mashhad, Iran.
authors.forename: Hamed
authors.initials: H
authors.lastname: Niyazmand
authors.affiliation: Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Ophthalmology, Mashhad Medical University, Mashhad, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Sedaghat
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000175:diagnosis; D001696:Biomechanical Phenomena; D003315:Cornea / Q000473:pathology*; D063171:Corneal Pachymetry; D019781:Corneal Topography; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis*; D008297:Male; D009216:Myopia / Q000175:diagnosis; D011446:Prospective Studies; D012372:ROC Curve; D014054:Tomography; D055815:Young Adult
keywords: Corneal hysteresis; Corneal resistance factor; Corneal thickness; Corneal volume; Keratoconus