Influence of corneal biomechanical properties on intraocular pressure differences between an air-puff tonometer and the goldmann applanation tonometer

Laura Tranchina, Marco Lombardo, Francesco Oddone, Sebastiano Serrao, Domenico Schiano Lomoriello, Pietro Ducoli

Research output: Contribution to journalArticle

Abstract

Purpose: To estimate the influence of corneal properties on intraocular pressure (IOP) differences between an air-puff tonometer (NT530P; Nidek) and the Goldmann applanation tonometer (Haag-Streit). Patients and Methods: The influence of central corneal thickness (CCT), keratometry, and Ocular Response Analyzer (Reichert) measurements of corneal viscoelasticity [corneal hysteresis (CH) and corneal resistance factor (CRF)] on IOP differences between tonometers was evaluated. Results: The CRF was calculated to be the best predictor of the differences in IOP readings between tonometers (r2=0.23; P<0.001), followed by CCT (r2=0.15; P=0.003) and CH (r 2=0.14; P=0.003). Keratometry performed very poorly as lone predictor of IOP differences. In a multiple regression model, CRF, CH, and CCT together accounted for 25% (r2=0.25; P

Original languageEnglish
Pages (from-to)416-421
Number of pages6
JournalJournal of Glaucoma
Volume22
Issue number5
DOIs
Publication statusPublished - Jun 2013

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Keywords

  • Applanation tonometry
  • Corneal biomechanics
  • Noncontact tonometry

ASJC Scopus subject areas

  • Ophthalmology

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