Results 161 to 170 of about 387,211 (228)
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Current Opinion in Ophthalmology, 1994
Computer-assisted videokeratography systems are becoming the prevailing method for analysis of the corneal surface. A realistic insight into the limitations of these topography systems is critical for proper interpretation of the data. Methods based on reflections have limited accuracy when measuring aspherical surfaces.
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Computer-assisted videokeratography systems are becoming the prevailing method for analysis of the corneal surface. A realistic insight into the limitations of these topography systems is critical for proper interpretation of the data. Methods based on reflections have limited accuracy when measuring aspherical surfaces.
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Documenta Ophthalmologica, 1977
This paper explores the many aspects of the nature and measurement of the corneal surface. Its structure and the factors that influence it are described. The traditional techniques of keratometry are summarized and there is an emphasis on new experimental methods of determining corneal topography including moiré, holographic interferometric and profile
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This paper explores the many aspects of the nature and measurement of the corneal surface. Its structure and the factors that influence it are described. The traditional techniques of keratometry are summarized and there is an emphasis on new experimental methods of determining corneal topography including moiré, holographic interferometric and profile
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Corneal Topography and Corneal Thickness in Children
Journal of Pediatric Ophthalmology & Strabismus, 2013Purpose: To evaluate the corneal topography, thickness, and elevation (anterior and posterior corneal surface) in children. Methods: One hundred eyes of 100 patients with a mean ± standard deviation age of 10.6 ± 2.7 years (range: 5 to 15 years) were imaged.
Shailaja P Reddy +2 more
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Visualization in corneal topography
Proceedings Visualization '98 (Cat. No.98CB36276), 2002The anterior surface of the eye ('cornea') is extremely important for good sight. Instruments measuring corneal shape conventionally visualize the surface characteristics by mapping the instantaneous radius of curvature onto a rainbow colour scale. This technique is known to have important drawbacks. Firstly, not corneal shape itself is visualized, but
Vos, Spoelder
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Repeatability of Corneal Topography: The "Corneal Field"
Journal of Refractive Surgery, 1995ABSTRACT BACKGROUND: The purpose of this study was to determine the interoccasion repeatability of keratometry, photokeratography, and videokeratography and to describe the "corneal field," a scheme for explaining videokeratography results.
Donald O. Mutti +2 more
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Corneal topography in cataract surgery
Current Opinion in Ophthalmology, 1996Keratometry and videokeratography are the most important means of evaluating induced corneal changes after surgery and have comparable sensitivities in the paracentral region of the cornea. When cataract surgery is planned, corneal topography can be used preoperatively in the calculation of IOL power, particularly in difficult cases, such as in ...
Brent R. McQueen +2 more
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Der Ophthalmologe, 2008
Various diagnostic procedures have been developed for analyzing the corneal surface. Corneal topographical measurements can be performed by classic Placido disc topographers and tomographers creating three-dimensional corneal models from cross-sectional images.
U. Ludwig, G. Duncker, C Herrmann
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Various diagnostic procedures have been developed for analyzing the corneal surface. Corneal topographical measurements can be performed by classic Placido disc topographers and tomographers creating three-dimensional corneal models from cross-sectional images.
U. Ludwig, G. Duncker, C Herrmann
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Corneal Topography Using Rasterstereography
European Journal of Implant and Refractive Surgery, 1989ABSTRACT: Rasterstereography is a new method of determining the topography of the comea. Unlike Placido disc types of systems it does not depend on the reflectivity of the corneal surface, and it can provide information about the entire corneal, limbal and interpalpebral conjunctival surfaces.
Joseph W. Warnicki +2 more
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Customized Topography-Guided Corneal Collagen Cross-linking for Keratoconus.
Journal of refractive surgery, 2017PURPOSE To compare the efficacy and safety of topography-guided corneal collagen cross-linking (TG-CXL) to conventional corneal CXL (C-CXL) in progressive keratoconus.
M. Cassagne +5 more
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The Effect of Trephination on Corneal Topography
Ophthalmic Surgery, Lasers and Imaging Retina, 1995* BACKGROUND AND OBJECTIVE: A prospective study was performed to assess the effect of trephination on corneal curvature. * MATERIALS AND METHODS: Thirty-seven fresh porcine globes with intact corneal epithelium were used. Radius of curvature, central dioptric power, and powers and axes of the steepest and flattest meridians were obtained ...
David S. Greenfield +2 more
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