Identification of Biomechanical Properties of the Cornea: The Ocular Response Analyzer

Repeatability of Ocular Biomechanical Data Measurements With a Scheimpflug-Based Noncontact Device on Normal Corneas

“…28 Changes in CH and CRF after LASIK, 4-6 epi-LASIK 29 and clear corneal phacoemulsification 30 are well known. CXL causes no changes in the two main parameters measured with ORA, 5,10 however, biomechanical differences were observed in corneas after CXL when applying the latest parameters of the latest ORA software.…”

Corneal Biomechanical Properties and Densitometry in a Case with Iridocorneal Endothelial Syndrome

“…Of these, corneal hysteresis and resistance factor characterize the viscoelastic properties of the cornea, especially those of the ground substance. 8 In our case, CH of the right and left eyes were 10.9 and 8.7 mmHg and CRF were 10.1 and 8.6 mmHg, respectively; means that corneal rigidity is lower in the affected eye. This decrease may be similar to the principle in postoperative corneal edema, bullous keratopathy and Fuch's corneal dystrophy in which corneal thickness increase and CH-CRF decreases.…”

“…This decrease may be similar to the principle in postoperative corneal edema, bullous keratopathy and Fuch's corneal dystrophy in which corneal thickness increase and CH-CRF decreases. 8 The ORA values of CH and CRF measures viscosity of the corneal ground substance, which, in turn provides an information related to corneal biomechanical state. Using ORA for ICE syndrome can provide an objective and reproducible method of measuring corneal biomechanics which will be possibly affected from disease progression.…”

Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging

“…This finding is indicative of a higher stiffness of the human cornea tissue despite its lower thickness. Other studies observed that corneas submitted to crosslinking, despite the decrease in thickness after the procedure, had different biomechanical behavior, reporting changes in the waveforms provided by the ORA (8,28) . The deformation data obtained by the Corvis ST provide information related to the biomechanical properties of the tissue, but further investigation is necessary to quantify elasticity and viscoelas ticity.…”