PURPOSE Aspects of the biomechanics and surface topography of fellow human corneas are known to exhibit midline symmetry, but the structural basis of these observations is poorly understood. The mechanical performance of the cornea is strongly influenced by the organization of stromal collagen fibrils. The present study was designed to examine and compare the organization of collagen fibrils in...

doi:10.3928/1081597X-20110519-01 T raditionally, biomechanical properties of the cornea have been assessed in vitro by measuring stress-strain and Young modulus on corneal strips. In 2005, the Ocular Response Analyzer (ORA; Reichert Technologies, Depew, New York) was launched as the fi rst commercial device claiming to provide in vivo measurements of corneal biomechanics.1 It utilizes a dynamic...

The cornea, the window of the eye, provides approximately two-thirds of the total refractive power. The unique set of corneal biomechanical properties determined by its complex structure plays an important role in maintaining corneal function and human vision system [1]. Many factors, like ageing, trauma, diseases or clinical refractive surgery would affect the corneal biomechanics and finally ...

BACKGROUND To better understand the role of corneal properties and intraocular pressure (IOP) in the evaluation of primary open-angle glaucoma (POAG); and to determine the feasibility of identifying glaucomatous optic neuropathy (GON) using IOP corrected and uncorrected for corneal biomechanics. METHODS Records from 1,875 eyes of consecutively evaluated new patients were reviewed. Eyes were e...

BACKGROUND The aim of this study was to determine the correlation between corneal hysteresis (CH) and the corneal resistance factor (CRF), which are both novel methods of analyzing ocular rigidity/elasticity, and various corneal characteristics, mainly corneal volume in normal subjects. METHODS This cross-sectional study included 500 normal eyes of volunteers. An ocular response analyzer (ORA...

Most techniques measuring corneal biomechanics in vivo are biased by side factors. We demonstrate the ability of optical coherence tomographic (OCT) vibrography to determine corneal material parameters, while reducing current prevalent restrictions of other techniques (such as intraocular pressure (IOP) and thickness dependency). Modal analysis was performed in a finite-element (FE) model to st...

Purpose. To evaluate the relationship of corneal biomechanical properties to refraction and corneal aberrometry in keratoconic eyes. Methods. A total of 81 consecutive keratoconic eyes of 81 patients ranging in age from 11 to 58 years were included in the study. Three groups were differentiated according to the severity of keratoconus: mild (37 eyes), moderate (24 eyes), and severe (20 eyes). V...

Assessment of corneal biomechanics for pre- and post-refractive surgery is great clinical importance. Corneal affect vision quality human eye. Many factors such as, age, diseases refractive surgery. There a need non-invasive in-vivo measurement due to shape preserving as opposed ex-vivo measurements that destructs tissue. In this study, new approach assessing non-invasively using ultrasound est...

Purpose We evaluated the impact of myopia on corneal biomechanical properties in primary open-angle glaucoma (POAG) and nonglaucoma patients, and the effect of modification of glaucoma on myopic eyes. Methods This cross-sectional study included 66 POAG eyes (33 myopia, 33 nonmyopia) and 66 normal eyes (33 myopia, 33 nonmyopia). Seven corneal biomechanical parameters were measured by ultra-hig...