Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22855
Title: The roles of cornea and axial length in corneal hysteresis among emmetropes and high myopes : a pilot study
Authors: Wong, YZ
Lam, AKC 
Keywords: Axial length
Corneal hysteresis
Corneal stromal thickness
Corneal volume
Myopia
Issue Date: 2015
Publisher: Taylor & Francis
Source: Current eye research, 2015, v. 40, no. 3, p. 282-289 How to cite?
Journal: Current eye research 
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 ¡Ó 0.90 mm versus 23.71 ¡Ó 0.79 mm), lower CH (10.17 ¡Ó 1.38 mmHg versus 11.11 ¡Ó 1.25 mmHg), and higher IOPcc (16.50 ¡Ó 3.05 mmHg versus 13.91 ¡Ó 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, £] = 0.591) and CV (£] = 0.575) had stronger association than IOPcc and AL for CH. Conclusions: High myopes exhibited lower CH than
URI: http://hdl.handle.net/10397/22855
ISSN: 0271-3683
EISSN: 1460-2202
DOI: 10.3109/02713683.2014.922193
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