Results 171 to 180 of about 387,211 (228)

Methods of Analysis of Corneal Topography

Journal of Refractive Surgery, 1989
ABSTRACT: The visual inspection of photokeratoscope mires permits the diagnosis of advanced anomalies in corneal shape and is an extremely useful adjunct to keratometry and slit-lamp microscope examination. However, corneal distortions too small to be appreciated by visual inspection of keratographs can seriously degrade visual acuity. In this article,
Stephen D. Klyce, Steven E. Wilson
openaire   +3 more sources

Noncontact Quantification of Topography of Anterior Corneal Surface and Bowman's Layer With High-Speed OCT.

Journal of refractive surgery, 2017
PURPOSE To quantify keratometry and wavefront aberration of the anterior corneal surface and epithelium-Bowman's layer interface using anterior segment optical coherence tomography (OCT).
H. Matalia, Mathew Francis, Tarun Gangil, Rachana S Chandapura, M. Kurian, R. Shetty, E. J. R. Nelson, Abhijit Sinha Roy   +7 more
semanticscholar   +1 more source

The Corneal Topography of Keratoconus

European journal of Implant and Refractive Surgery, 1995
This article is the sixth in a series which describes the role of corneal topography and highlights its value in different clinical settings. It illustrates and describes the variety of topographical patterns seen in keratoconus. The importance of screening for sub-clinical cases prior to refractive keratoplasty and the development of software and ...
Emanuel S. Rosent, Melanie C. Corbett, David C. Saunders, David P.S. O'Brart   +3 more
openaire   +2 more sources

Corneal Topography and the Hirschberg Test.

Ophthalmic and Visual Optics, 1991
An alternative approach to the problem of reconstucting the topography of the cornea by measurement of images formed by the corneal reflecting surface may be had by considering the effect of aspherical corneal topography on the "Hirschberg Test," a traditional clinical maneuver for the estimation of ocular misalignment.
openaire   +3 more sources

Corneal topography and contact lenses [PDF]

Ophthalmology Clinics of North America, 2003
Regardless of whether CVK is used qualitatively for RGP lens design selection or quantitatively in RGP parameter selection, it has a significant role in contact lens practice. Further advancements and testing on CVK-based RGP fitting modules and fluorescein simulations will make CVK an invaluable tool for the RGP lens fitter.
openaire   +2 more sources

Corneal curvature gradient map: a new corneal topography map to predict the corneal healing process.

Journal of refractive surgery, 2014
PURPOSE To evaluate a new curvature gradient topography map to predict postoperative corneal remodeling. METHODS In this retrospective study, 32 eyes of 16 patients with myopia underwent excimer ablation surgery with a postoperative high curvature ...
P. Vinciguerra, C. Roberts, E. Albé, M. Romano, A. Mahmoud, S. Trazza, R. Vinciguerra   +6 more
semanticscholar   +1 more source

CORNEAL TOPOGRAPHY: A CLINICAL MODEL

Ophthalmic and Physiological Optics, 1986
A keratometric photokeratoscopic study of 220 eyes representative of a normal population leads to the ellipsoid corneal model proposed. This model is applicable to the design of rigid corneal lenses and to the calculation of computer models of the dioptric system of the eye.
Donald P. M. Lydon, Christine Wilson, Michel Guillon   +2 more
openaire   +3 more sources

Stromal surface topography-guided custom ablation as a repair tool for corneal irregular astigmatism.

Journal of refractive surgery, 2015
PURPOSE To illustrate the concept of using a stromal surface topography-guided procedure for therapeutic repair after a complication following primary laser refractive surgery.
D. Reinstein, M. Gobbe, T. Archer, G. Youssefi, H. Sutton   +4 more
semanticscholar   +1 more source

The Topography of Corneal Astigmatism

European journal of Implant and Refractive Surgery, 1994
This article discusses the role of computerized videokeratoscopic topography in analysing corneal astigmatism. It describes and explains the normal topographical astigmatic patterns, an understanding of which is essential for the interpretation of corneal topographic maps.
David P.S. O'Brart, David C. Saunders, Emanuel Rosen, Melanie C. Corbett   +3 more
openaire   +2 more sources

Measurement of corneal topography in keratoconus

Ophthalmic and Physiological Optics, 1993
A new method is described for calculating the topography and curvature of an irregularly shaped cornea, Vertical planes of light are projected onto the cornea and points in x, y, z space are calculated from the light images on the corneal surface. A matrix of points is produced on the cornea and a mathematical surface is filled to them.
E G Woodward, D A de Cunha
openaire   +2 more sources