To determine consistent change over time in keratoconus disease, it is necessary to establish progression cut-off values based on intersession variability of the device used monitor cornea. The aim this study was analyze accuracy corneal parameters using Scheimpflug tomography and anterior segment optical coherence healthy keratoconic eyes varying severity that indicate real progression. Three ...

From an optical perspective the eye is far from perfect. This is a fact that is extensively supported by literature; for instance, Prof. Navarro recently provided us with a fantastic critical review on the various theories behind the different eye models and their flaws.1 The human eye has considerable amounts of higher-order aberrations even when it is emmetropic,2 with great inter-individual ...

Aim: This observational clinical case series examined patients with keratoconus (KC) fit with keratoconic bi-aspheric (KBA) lenses to assess visual acuity (VA), wavefront aberrations, physiological fitting, subjective comfort, and manufacturer’s fitting guidelines. Materials and methods: Seven adult patients (11 eyes, four females, mean age: 34.15 ± 14.12) with nipple cones from the Hadassah Ac...

patients with keratoconus constitute a large proportion of patients suffering from anterior segment disorders. as of this time, however, its pathogenesis has not yet been elucidated. a reduction in cross-link between collagen molecules has been observed in keratoconic eyes as compared to normal ones. present approaches only address refractive errors resulting from the abnormal abnormal corneal ...

purpose: to compare visual and refractive outcomes as well as graft survival after penetrating keratoplasty (pk) in keratoconic patients with or without acute hydrops. methods: in this comparative interventional case series, 14 eyes of 14 keratoconic patients with acute hydrops (group 1) and 37 eyes of 37 keratoconic patients with no history of acute hydrops (group 2) underwent pk. visual acuit...

PURPOSE Loss of corneal strength is a central feature of keratoconus progression. However, it is currently difficult to measure corneal mechanical changes noninvasively. The objective of this study is to evaluate if Brillouin optical microscopy can differentiate the mechanical properties of keratoconic corneas versus healthy corneas ex vivo. METHODS We obtained eight tissue samples from healt...

purpose : to investigate the validity of pentacam derived parameters like corneal volume distribution and percentage increase in volume in differentiation of mild to moderate keratoconus from normal corneas methods : forty eyes with mild to moderate keratoconus and 200 normal eyes were studied by pentacam. corneal volume was calculated within diameters from 1.0 to 7.0 mm with 0.5 mm steps cente...