STRUMENTI

Mulder JA, van Tilborg MM, Huntjens B, Introduzione: lo sviluppo tecnologico permette l’acquisizione dei parametri cornealiper una area corneale sempre più ampia ed alcuni strumenti ci permettono anche diottenere delle misure del profilo sclerale. Alcuni di questi strumenti acquisiscono iparametri...

Purpose To compare and analyze the interchangeability of three measuring systems, each based on a different technique, for central corneal thickness (CCT) analysis. Methods CCT measurements were measured using optical coherence tomography (OCT), non-contact specular microscopy (NCSM), and ultrasonic pachymetry...

Purpose To determine the reliability of corneal endothelial cell density (ECD) obtained by automated specular microscopy versus that of validated manual methods and factors that predict such reliability. Methods Sharp central images from 94 control and 106 glaucomatous eyes were...

Purpose To evaluate the repeatability of automatic measurements by a new anterior segment optical coherence tomographer (AS-OCT) combined with Placido topography and their agreement with those provided by 2 rotating Scheimpflug cameras. Setting G.B. Bietti Foundation IRCCS, Rome, Italy. Design...

SIGNIFICANCE The authors analyze factors influencing bivariate contour ellipse area (BCEA) in healthy and pathologic eyes and how such factors may affect isolated (static BCEA) or microperimetric fixation (dynamic BCEA). They conclude that aging increases both dynamic BCEA and examination time,...

Purpose: To evaluate a new method of calculation of total corneal astigmatism based on Gaussian optics and the power design of a spherocylindrical lens (C) in the healthy eye and to compare it with keratometric (K) and power vector (PV) methods. Methods: A total of 92...

Purpose: To determine the effect of cyclopentolate, tropicamide, and artificial tear drops on higher-order aberrations (HOAs) in normal eyes with OPD-Scan III (Nidek Inc., Tokyo, Japan). Methods: In this study, 189 eyes of individuals aged 20 to 35 years were selected as...

Abstract Background To assess the precision and agreement of measurements of higher order aberrations (HOAs) obtained with a ray tracing aberrometer (iTrace) and a Hartmann-Shack aberrometer (Topcon KR-1 W). Methods Prospective evaluation of the diagnostic test. Data from the right eyes...

To evaluate the contribution of fixational eye movements to dynamic aberration, 50 healthy eyes were examined with an original custom-built Shack-Hartmann aberrometer, running at a temporal frequency of 236Hz, with 22 lenslets across a 5mm pupil, synchronized with a 236Hz...

Abstract PURPOSE:To describe a method by which mapped corneal elevation data can be used for ray-tracing analysis of the effective corneal power. METHODS:Mapped elevation data of the front and back surface of the cornea exported by a clinical Scheimpflug camera...

Abstract Coherence scanning interferometry (CSI) offers three-dimensional (3D) measurement of surface topography with high precision and accuracy. Defocus within the interferometric objective lens, however, is commonly present in CSI measurements and reduces both the resolving power of the imaging system...

ABSTRACT Corneal imaging is essential for diagnosing and management of a wide variety of ocular diseases. Corneal topography is used to characterize the shape of the cornea, specifically, the anterior surface of the cornea. Most corneal topographical systems are based...

Abstract PURPOSE:To determine the accuracy of the PlusoptiX A12 photoscreener (PlusoptiX, Inc., Atlanta, GA) in detecting amblyopia or ambylogenic risk factors in pediatric patients in Nebraska. METHODS:Using the PlusoptiX A12 photoscreener, data were collected from pediatric patients seen at a...

SIGNIFICANCE A corneal heat-transfer model is presented to quantify simultaneous measurements of fluorescein tear-breakup area (TBA) and ocular-surface temperature (OST). By accounting for disruption of the tear-film lipid layer (TFLL), we report evaporation rates through lipid-covered tear. The modified heat-transfer...

SIGNIFICANCE The proposed automated approach for estimating the quality of the tear film closes the gap between the manual and automated assessment, translating the high-speed videokeratoscopy technology from scientific laboratories to a clinical practice. PURPOSE To develop and test a...

Abstract Background and Objectives Objective was to examine new findings regarding conjunctival/scleral shape mapped with a novel wide field elevation topography device and software, to propose a new classification system for scleral shape. Methods The Scleral Shape Study Group (SSSG)...

Abstract Purpose To determine the change and rate of change in central corneal thickness (CCT) and their determinants. Design Longitudinal observational population-based study. Methods 758 normal and 58 glaucomatous subjects underwent complete eye examination, with CCT measurements at two separate...

SIGNIFICANCE The cornea is a viscoelastic tissue with viscous and elastic properties. The information of corneal biomechanical changes in high myopia has implications for understanding the pathogenesis of high myopia and primary open angle glaucoma. However, the knowledge of corneal...

Abstract Purpose To evaluate the intra-session repeatability of keratometric measurements obtained in healthy eyes with the Verion image-guided system (Alcon Laboratories Inc, Fort Worth, Texas, USA) as well as the interchangeability of such measurements with those obtained with an optical...

Purpose: To evaluate the reproducibility of Fourier domain anterior segment optical coherence tomography (RTVue) based on repeated measurements of corneal thickness (CT) and epithelial thickness (ET) and to test daytime-dependent changes of these parameters. Sorgente: Reproducibility and Daytime-Dependent Changes of...

Abstract Background Keratometry is a critical determinant of the post-operative refractive outcome. This study evaluates the comparability of keratometry measurements obtained using the Verion Optical Imaging system with devices used in current clinical practice. Sorgente: Assessment of corneal curvature using...

Purpose To assess the validity and repeatability of the Aston Halometer. Setting University clinic, United Kingdom. Design Prospective, repeated-measures experimental study. Methods The halometer comprises a bright light-emitting-diode (LED) glare source in the center of an iPad4. Letters subtending 0.21°...

To evaluate and compare (anterior and posterior) corneal parameters obtained by use of 3 corneal topography devices. Sorgente: Comparison of anterior and posterior topographic analysis between 3 imaging systems...

sorgente http://onlinelibrary.wiley.com/doi/10.1111/ceo.13082/abstract...

Objectives: To assess accuracy and repeatability of the CASIA swept-source optical coherence tomographer (SS-OCT) in measuring contact lens (CL) radii of curvature and thicknesses compared with verified CL parameters and to investigate intrasession and intersession repeatability of the CASIA SS-OCT...

Abstract The slit lamp enables a well-illuminated and magnified view of the eye. There have been previous imaging devices used for recording, however the quality of the stills and video is limited by cost. We present a relatively lower cost...