ORA waveform-derived biomechanical parameters to distinguish normal from keratoconic eyes
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چکیده
منابع مشابه
ORA waveform-derived biomechanical parameters to distinguish normal from keratoconic eyes.
PURPOSE To evaluate the ability of the Ocular Response Analyzer (ORA; Reichert Ophthalmic Instruments, Buffalo, NY) to distinguish between normal and keratoconic eyes, by comparing pressure and waveform signal-derived parameters. METHODS This retrospective comparative case series study included 112 patients with normal corneas and 41 patients with bilateral keratoconic eyes. One eye from each...
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Corneal hysteresis (CH) is a parameter which measures the viscoelastic behaviour of the cornea, indicating its biomechanical integrity1. Some clinical conditions such as keratoconus, Fuchs corneal dystrophy, high myopia, glaucoma and corneal refractive surgery, may induce changes in corneal biomechanical properties, leading to a decrease in CH2-6. Astigmatism, a refractive error related to corn...
متن کاملEvaluation of Ocular Biomechanical Indices to Distinguish Normal from Keratoconus Eyes
Purpose: To compare and assess the ability of pressure-derived parameters and corneal deformation waveform signal-derived parameters of the ocular response analyzer (ORA) measurement to distinguish between keratoconus and normal eyes, and to develop a combined parameter to optimize the diagnosis of keratoconus. Materials and methods: One hundred and seventy-seven eyes (177 patients) with kerato...
متن کاملCorneal Biomechanical Assessment Using Corneal Visualization Scheimpflug Technology in Keratoconic and Normal Eyes
Purpose. To compare the corneal biomechanical properties of keratoconic patients and age-matched controls using corneal visualization Scheimpflug technology (Corvis ST). Methods. Sixty keratoconic eyes from 47 keratoconus patients and 60 normal eyes from 60 controls were enrolled in this prospective study. Tomography and biomechanical parameters of all eyes were obtained with the Pentacam and C...
متن کاملComparison of keratometric and pachymetric parameters with Scheimpflug imaging in normal and keratoconic Asian eyes
PURPOSE To evaluate the keratometric and pachymetric parameters of keratoconic corneas of Asian eyes with the Scheimpflug imaging camera. PATIENTS AND METHODS This is a cross-sectional study of 22 eyes with Amsler-Krumeich stage 1 keratoconus and 48 eyes from normal subjects conducted in a tertiary eye hospital. A rotating Scheimpflug imaging system, the Pentacam, was used to evaluate all eye...
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ژورنال
عنوان ژورنال: Arquivos Brasileiros de Oftalmologia
سال: 2013
ISSN: 0004-2749
DOI: 10.1590/s0004-27492013000200011