The roles of cornea and axial length in corneal hysteresis among emmetropes and high myopes: A pilot study

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Abstract

: reproduction in whole or part not permitted. Abstract Purpose: To observe the roles of cornea and axial length (AL) in corneal hysteresis (CH) among emmetropes and high myopes. Materials and Methods: The CH, corneal resistance factor (CRF) and corneal-compensated intraocular pressure (IOPcc) of 40 young emmetropes (spherical equivalent +/-0.50 D) and 40 age-matched high myopes (-6D or more) were measured by the Ocular Response Analyzer. AL was measured using a partial coherence interferometer. The mean keratometry reading (meanK) and corneal volume (CV) in 4 zones were measured using the Pentacam. Full stromal thickness (FST) and epithelial and Bowman's thicknesses (Epi + BT) were evaluated using confocal microscopy. Valid confocal microscopic results from the more emmetropic eyes of 30 emmetropes and the more myopic eyes of 27 high myopes were studied. Results: High myopes exhibited significantly longer AL (27.34 ± 0.90 mm versus 23.71 ± 0.79 mm), lower CH (10.17 ± 1.38 mmHg versus 11.11 ± 1.25 mmHg), and higher IOPcc (16.50 ± 3.05 mmHg versus 13.91 ± 2.49 mmHg) compared with emmetropes. The 2 groups showed similar CRF, CVs, meanK, FST and Epi + BT. By combining the results of both groups, CH and CRF were significantly correlated with FST (r2= 0.368 and r2= 0.408, respectively), CVs (r2= 0.251-0.391 and r2= 0.201-0.346, respectively), but not with Epi + BT or meanK. Furthermore, AL and IOPcc were significantly correlated with CH (r2= 0.112 and r2= 0.161, respectively) but not with CRF. The multivariate analysis indicated that FST (standardized coefficients, β = 0.591) and CV (β = 0.575) had stronger association than IOPcc and AL for CH. Conclusions: High myopes exhibited lower CH than emmetropes. Although CH had stronger correlation with FST than AL, it might contain the biomechanical properties of components other than the cornea.
Original languageEnglish
Pages (from-to)282-289
Number of pages8
JournalCurrent Eye Research
Volume40
Issue number3
DOIs
Publication statusPublished - 1 Mar 2015

Keywords

  • Axial length
  • Corneal hysteresis
  • Corneal stromal thickness
  • Corneal volume
  • Myopia

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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