EyeSys corneal topography measurement applied to calibrated ellipsoidal convex surfaces.
نویسندگان
چکیده
منابع مشابه
EyeSys corneal topography measurement applied to calibrated ellipsoidal convex surfaces.
AIMS/BACKGROUND This study was carried out to assess the accuracy of the EyeSys videokeratoscope by using convex ellipsoidal surfaces of known form. METHODS PMMA convex ellipsoidal buttons were calibrated using Form Talysurf analysis which allowed subsequent calculation of the vertex radius and p value of the surface. The EyeSys videokeratoscope was used to examine the same ellipsoids. The ta...
متن کاملComparison of videokeratoscope and autokeratometer measurements on ellipsoid surfaces and human corneas.
BACKGROUND Various studies have compared the accuracy and repeatability of autokeratometers and videokeratoscopes using calibrated convex surfaces. We investigate the agreement between the Topcon KR-3500 autokeratometer and the EyeSys videokeratoscope on human corneas and calibrated convex surfaces. METHODS Measurements were obtained from 30 convex ellipsoidal buttons and 20 right eyes of 20 ...
متن کاملDual interferometer for dynamic measurement of corneal topography.
The cornea is the anterior most surface of the eye and plays a critical role in vision. A thin fluid layer, the tear film, coats the outer surface of the cornea and serves to protect, nourish, and lubricate the cornea. At the same time, the tear film is responsible for creating a smooth continuous surface, where the majority of refraction takes place in the eye. A significant component of visio...
متن کاملMeasurement of Angle Kappa Using Ultrasound Biomicroscopy and Corneal Topography
PURPOSE To introduce a new convenient and accurate method to measure the angle kappa using ultrasound biomicroscopy (UBM) and corneal topography. METHODS Data from 42 eyes (13 males and 29 females) were analyzed in this study. The angle kappa was measured using Orbscan II and calculated with UBM and corneal topography. The angle kappa of the dominant eye was compared with measurements by Orbs...
متن کاملCorneal topography by keratometry.
AIMS To investigate the ability of a telecentric keratometer to describe the asphericity and curvature of convex ellipsoidal surfaces and human corneas. METHODS 22 conicoidal convex surfaces and 30 human corneas were examined by conventional keratometry. Additional keratometric measurements were made when the surface was tilted in the horizontal plane relative to the instrument optical axis. ...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1995
ISSN: 0007-1161
DOI: 10.1136/bjo.79.9.797