Influence of Pachymetry and Intraocular Pressure on Dynamic Corneal Response Parameters in Healthy Patients

Influence of Pachymetry and Intraocular Pressure on Dynamic Corneal Response Parameters in Healthy Patients

Author Vinciguerra, Riccardo Google Scholar
Elsheikh, Ahmed Google Scholar
Roberts, Cynthia J. Google Scholar
Ambrosio, Renato, Jr. Autor UNIFESP Google Scholar
Kang, David Sung Yong Google Scholar
Lopes, Bernardo T. Autor UNIFESP Google Scholar
Morenghi, Emanuela Google Scholar
Azzolini, Claudio Google Scholar
Vinciguerra, Paolo Google Scholar
Abstract PURPOSE: To evaluate the influence of pachymetry, age, and intraocular pressure in normal patients and to provide normative values for all dynamic corneal response parameters (DCRs) provided by dynamic Scheimpflug analysis. METHODS: Seven hundred five healthy patients were included in this multicenter retrospective study. The biomechanical response data were analyzed to obtain normative values with their dependence on corrected and clinically validated intraocular pressure estimates developed using the finite element method (bIOP), central corneal thickness (CCT), and age, and to evaluate the influence of bIOP, CCT, and age. RESULTS: The results showed that all DCRs were correlated with bIOP except deflection amplitude (DefA) ratio, highest concavity (HC) radius, and inverse concave radius. The analysis of the relationship of DCRs with CCT indicated that HC radius, inverse concave radius, deformation amplitude (DA) ratio, and DefA ratio were correlated with CCT (rho values of 0.343, -0.407, -0.444, and -0.406, respectively). The age group subanalysis revealed that primarily whole eye movement followed by DA ratio and inverse concave radius were the parameters that were most influenced by age. Finally, custom software was created to compare normative values to imported examinations. CONCLUSIONS: HC radius, inverse concave radius, DA ratio, and DefA ratio were shown to be suitable parameters to evaluate in vivo corneal biomechanics due to their independence from IOP and their correlation with pachymetry and age. The creation of normative values allows the interpretation of an abnormal examination without the need to match every case with another normal patient matched for CCT and IOP.
Language English
Sponsor Oculus Optikgerate GmbH
Date 2016
Published in Journal Of Refractive Surgery. Thorofare, v. 32, n. 8, p. 550-561, 2016.
ISSN 1081-597X (Sherpa/Romeo, impact factor)
Publisher Slack Inc
Extent 550-561
Access rights Closed access
Type Article
Web of Science ID WOS:000384899900006

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