Results 211 to 220 of about 15,938,885 (242)
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Higher-order aberrations induced by nuclear cataract
Journal of Cataract and Refractive Surgery, 2008To measure higher-order aberrations (HOAs) in the entire eye and in the internal optics (lens) in patients with nuclear cataract.Department of Ophthalmology, University of Ulsan College of Medicine, Seoul, Korea.A visual function analyzer that combines ray-tracing aberrometry and corneal topography was used to measure wavefront aberrations in 33 eyes ...
Jooeun, Lee +2 more
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Higher Order Aberrations After Keratoplasty for Keratoconus
Optometry and Vision Science, 2013ABSTRACT Purpose To compare higher order aberrations (HOAs) caused by the anterior and posterior corneal surfaces after conventional penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK), and automated lamellar therapeutic keratoplasty (ALTK) in patients undergoing corneal ...
Salvetat M. L. +7 more
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Graefe's Archive for Clinical and Experimental Ophthalmology, 2010
Advances in the optical design of soft contact lenses have seen certain manufacturers incorporate aspheric optics into soft lenses in an attempt to reduce spherical aberration, to provide superior visual performance. The aim of this study is to determine the on-eye differences in spherical aberration and higher order aberrations (HOA) between the ...
Colm, McAlinden +3 more
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Advances in the optical design of soft contact lenses have seen certain manufacturers incorporate aspheric optics into soft lenses in an attempt to reduce spherical aberration, to provide superior visual performance. The aim of this study is to determine the on-eye differences in spherical aberration and higher order aberrations (HOA) between the ...
Colm, McAlinden +3 more
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About Higher Order Aberrations
2016So far we have considered third-order aberrations. In this chapter, we analyze some topics related to higher order aberrations.
Antonio Romano, Roberto Cavaliere
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Optimizing higher-order aberrations with intraocular lens technology
Current Opinion in Ophthalmology, 2007Aspheric intraocular lens technology has been implemented during the past 5 years, and more and more intraocular lenses with different amounts of asphericity are becoming available. Despite the efficacy in the correction of spherical aberration and the good results on implanted eyes, the theoretical advantages of aspheric intraocular lenses are still ...
Roberto, Bellucci, Simonetta, Morselli
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Higher-order aberrations and visual acuity after LASEK
International Ophthalmology, 2007To determine ocular higher-order aberrations (HOAs) in eyes with supernormal vision after myopic astigmatic laser subepithelial keratomileusis (LASEK) and to compare the findings with those in eyes with natural supernormal vision.Ocular HOAs were measured after LASEK in 20 eyes of 12 myopic astigmatic patients with postoperative uncorrected visual ...
Berrak, Urgancioglu +2 more
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The effect of corneal infiltrates on densitometry and higher‐order aberrations
Clinical and Experimental Optometry, 2019This study aimed to measure the effects of persistent corneal subepithelial infiltrates associated with epidemic keratoconjunctivitis on corneal densitometry and total corneal higher order aberrations (HOAs), and to compare these measurements with the data obtained from their fellow unaffected healthy eyes.This prospective cross-sectional study ...
Kemal, Tekin +5 more
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Corneal Higher Order Aberrations: A Method to Grade Keratoconus
Journal of Refractive Surgery, 2006ABSTRACT PURPOSE: To use the anterior corneal surface higher order aberrations as a tool to detect and grade keratoconus using corneal map analysis videokeratoscopy. METHODS: A prospective observational comparative study of 80 eyes was performed. The eyes were divided into two groups.
Jorge L, Alió, Mohamed H, Shabayek
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Diurnal Variation of Higher Order Aberrations in Human Eyes
Journal of Refractive Surgery, 2007Purpose: To evaluate diurnal variation of higher order aberrations in human eyes. Methods: A prospective study of 20 myopic eyes was performed.
Sabong, Srivannaboon +2 more
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Canonical aberration theory for calculating higher-order chromatic aberrations
Journal of Applied Physics, 1991Canonical aberration theory has been developed in previous papers by the author. In the present study, the canonical aberration theory has been used to deal with first- and third-order chromatic aberrations (including position and momentum aberrations at an arbitrary observation plane) for rotationally symmetrical optical systems.
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