title: Influence of Pachymetry and Intraocular Pressure on Dynamic Corneal Response Parameters in Healthy Patients.
abstract: OBJECTIVE
  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. [J Refract Surg. 2016;32(8):550-561.].
authors: Riccardo
authors: R
authors: Vinciguerra
authors: Ahmed
authors: A
authors: Elsheikh
authors: Cynthia J
authors: CJ
authors: Roberts
authors: Renato
authors: R
authors: Ambrósio
authors: David Sung Yong
authors: DS
authors: Kang
authors: Bernardo T
authors: BT
authors: Lopes
authors: Emanuela
authors: E
authors: Morenghi
authors: Claudio
authors: C
authors: Azzolini
authors: Paolo
authors: P
authors: Vinciguerra
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology; D001696:Biomechanical Phenomena; D003315:Cornea / Q000502:physiology*; D063171:Corneal Pachymetry; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012189:Retrospective Studies; D014065:Tonometry, Ocular; D055815:Young Adult