A New Biomechanical Deformation Response Parameter: Change in Central Corneal Thickness During Air Puff Induced Corneal Deformation.

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  • Additional Information
    • Source:
      Publisher: Informa Healthcare Country of Publication: England NLM ID: 8104312 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1460-2202 (Electronic) Linking ISSN: 02713683 NLM ISO Abbreviation: Curr Eye Res Subsets: MEDLINE
    • Publication Information:
      Publication: London : Informa Healthcare
      Original Publication: London : IRL Press, [c1981-
    • Subject Terms:
      Cornea*/physiology ; Cornea*/diagnostic imaging ; Intraocular Pressure*/physiology; Humans ; Male ; Female ; Biomechanical Phenomena/physiology ; Middle Aged ; Aged ; Adult ; Elasticity/physiology ; Tissue Donors ; Corneal Pachymetry ; Tonometry, Ocular ; Aged, 80 and over
    • Abstract:
      Purpose: To investigate the percent change in central corneal thickness (%ΔCCT) during air-puff-induced deformation as an indicator of corneal biomechanical response.
      Methods: Forty ex vivo human eyes from forty donors were imaged using the CorVis ST at experimentally controlled intraocular pressure (IOP) of 10, 20, 30, and 40 mmHg, followed by uniaxial strip testing to calculate tensile modulus. The CorVis ST research software tracked the anterior and posterior cornea edges and determined the dynamic corneal response (DCR) parameters. Eyes were excluded if image quality or posterior tracking issues were present. Custom algorithms were used to calculate CCT during deformation using a ray-tracing method to correct for Scheimpflug and optical distortion within each image. Correlation and stepwise regression analyses between the shape-related DCR parameters and %ΔCCT were conducted. A mixed model analysis was performed to test the effect of IOP and the strongest significant predictors of the stepwise regression on %ΔCCT. The significance threshold was set to p  < 0.05.
      Results: Thirty eyes were ultimately analyzed and CCT increased significantly from the pre-deformation state to the highest concavity state at each IOP level ( p  < 0.001). IOP and multiple shape DCRs were found to be significantly related to %ΔCCT ( p  < 0.0001). The strongest predictor of %ΔCCT was integrated inverse radius (IIR) ( p  < 0.0001; partial R 2 = 0.4772) with no other parameter having a partial R 2 value greater than 0.04. The mixed model analysis showed that IIR was the sole predictor ( p  = 0.0098) and IOP was no longer significant as a single predictor. However, the interaction of IIR with IOP ( p  = 0.0023) had a significant effect on %ΔCCT.
      Conclusion: Percent change in CCT is influenced by corneal stiffness as indicated by the significant relationship with IIR. The %ΔCCT may be a potential biomarker for determining differences in corneal deformation response with corneal diseases.
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    • Grant Information:
      R01 EY027399 United States EY NEI NIH HHS
    • Contributed Indexing:
      Keywords: Corneal biomechanics; Corvis ST; central corneal thickness; corneal deformation; scheimpflug imaging
    • Publication Date:
      Date Created: 20240417 Date Completed: 20240717 Latest Revision: 20240719
    • Publication Date:
      20240719
    • Accession Number:
      PMC11254558
    • Accession Number:
      10.1080/02713683.2024.2338228
    • Accession Number:
      38629736