purpose: to evaluate corneal hysteresis and corneal resistance factor in penetrating keratoplasty grafts in a group of keratoconic eyes using the ocular response analyzer (ora) and to evaluate the relationship between donor size, donor-recipient disparity and central graft thickness (cgt), and ora parameters. methods: this cross-sectional study was conducted on 34 eyes of 34 keratoconus patient...

Methods: Ten eyes of 10 patients aged 26.5 6 5.7 (mean 6 SD) years with progressive keratoconus were treated with UV-A– riboflavin CXL and assessed with the Ocular Response Analyzer (ORA) that measured corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg), and corneal compensated intraocular pressure (IOPcc). Intraocular pressure was also meas...

PURPOSE To develop a method for evaluating viscosity and elasticity of the cornea and to examine the effect that both properties have on hysteresis. METHODS A three-component spring and dashpot model was created in Simulink in Matlab to represent the purely elastic and viscoelastic behavior of the cornea during a measurement using device called an ocular response analyzer (ORA). Values for el...

OBJECTIVE To identify the major risk factors for primary open-angle glaucoma (POAG) in individuals of African descent. METHODS We searched PubMed for relevant articles, with results spanning April 1947 to present. All abstracts were reviewed and, where relevant to POAG and race, articles were catalogued and analyzed. Additional sources were identified through citations in articles returned by...

The aim of this study is to investigate the effect two antiglaucoma procedures, namely trabeculectomy and Ex-PRESS mini-shunt insertion on biomechanical properties cornea. This a prospective study. Thirty patients (30 eyes) were included in Nineteen eyes had an shunt inserted (Group 1) 11 2). examination time points for both groups one three weeks preoperatively at month 1, 6, 12 postoperativel...

INSTRUCTIONS FOR USE This Medical Policy provides assistance in interpreting UnitedHealthcare benefit plans. When deciding coverage, the enrollee specific document must be referenced. The terms of an enrollee's document (e.g., Certificate of Coverage (COC) or Summary Plan Description (SPD) and Medicaid State Contracts) may differ greatly from the standard benefit plans upon which this Medical P...

BACKGROUND The purpose of this study was to evaluate the effects of laser-assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) on corneal biomechanical properties. METHODS We used the ocular response analyzer to measure corneal hysteresis (CH) and corneal resistance factor (CRF) before and after refractive surgery. RESULTS In all, 230 eyes underwent LASIK and 115 ey...

purpose: to compare corneal biomechanical properties and intraocular pressure (iop) in eyes with pseudophakic bullous keratopathy (pbk) before and after descemet stripping automated endothelial keratoplasty (dsaek). methods: this prospective non-randomizedintrasubject comparative study was conducted on 44eyes of 22 patients with the diagnosis ofpbk who underwent dsaek in one eye.intraocular pre...