Results 111 to 120 of about 88,327 (313)

The Constant Astigmatism Equation. New Exact Solution

, 2013
In this paper we present a new solution for the Constant Astigmatism equation.
Manganaro, Natale, Pavlov, Maxim V.
core   +1 more source

Influence of artificial tears on corneal parameter measurement using three different devices: Keratometry and Scheimpflug technology, a randomized trial

Acta Ophthalmologica, EarlyView.
Abstract Purpose To evaluate the effect of artificial tear (AT) application on the repeatability of corneal parameters with three different devices. Methods In this prospective, randomized clinical trial, 145 patients were measured with one of three devices in the Department of Ophthalmology, Goethe University, Frankfurt, Germany.
Titus Schug, Thomas Kohnen, Klemens Paul Kaiser, Christoph Lwowski   +3 more
wiley   +1 more source

Polar Value Analysis of Low to Moderate Astigmatism with Wavefront-Guided Sub-Bowman Keratomileusis

Journal of Ophthalmology, 2017
Purpose. To evaluate the astigmatic outcomes of wavefront-guided sub-Bowman keratomileusis (WFG-SBK) for low to moderate myopic astigmatism. Methods. This study enrolled 100 right eyes from 100 patients who underwent WFG-SBK for the correction of myopia ...
Pisong Yan, Zhiyu Du, Yu Zhang
doaj   +1 more source

Orbital angular momentum exchange in an optical parametric oscillator

, 2004
We present a study of orbital angular momentum transfer from pump to down-converted beams in a type-II Optical Parametric Oscillator. Cavity and anisotropy effects are investigated and demostrated to play a central role in the transverse mode dynamics ...
A. Yariv, A. Z. Khoury, Antony E. Siegman, J. A. O. Huguenin, M. Marte, M. Martinelli, M. W. Beijersbergen, P. Nussenzveig, V. G. Dmitriev   +8 more
core   +1 more source

Considerations on the Haigis formula: Are better outcomes possible with tuning?

Acta Ophthalmologica, EarlyView.
Abstract Purpose To design a vergence‐based lens power formula based on the classical Haigis formula for better outcomes while retaining the original formula architecture. Methods Four new formula variants (A–D) incorporating a sum of segments correction for axial length, harmonic mean of corneal radii instead of arithmetic mean (all variants), and ...
Achim Langenbucher, Nóra Szentmáry, Jascha Wendelstein, Alan Cayless, Benj Fassbind, Peter Hoffmann   +5 more
wiley   +1 more source

Toric intraocular lens implantation in cataract patients with corneal opacity

BMC Ophthalmology, 2020
Background To evaluate the effect of toric intraocular lens implantation in cataract patient with corneal opacity and high astigmatism. Methods Thirty-one eyes of 31 patients who underwent cataract surgery with toric intraocular lens implantation were ...
Ho Ra, Ho Sik Hwang, Hyun Seung Kim, Man Soo Kim, Eun Chul Kim   +4 more
doaj   +1 more source

High-order myopic coronagraphic phase diversity (COFFEE) for wave-front control in high-contrast imaging systems

, 2013
The estimation and compensation of quasi-static aberrations is mandatory to reach the ultimate performance of high-contrast imaging systems. COFFEE is a focal plane wave-front sensing method that consists in the extension of phase diversity to high ...
Dohlen, K., Ferrari, M., Mugnier, L. M., Paul, B., Sauvage, J. -F.   +4 more
core   +3 more sources

Efficacy of interventions for myopia control in children: A systematic review with network meta‐analyses

Acta Ophthalmologica, EarlyView.
Abstract To determine the effectiveness of various interventions in reducing myopia progression in children. Literature databases were searched on December 2, 2023: PubMed, Embase, the Cochrane Central, Web of Science Core Collection, BIOSIS Previews, Current Contents Connect, Data Citation Index, Derwent Innovations Index, KCI‐Korean Journal Database,
Diana Chabané Schmidt, Anders Hvid‐Hansen, Nina Jacobsen, Trine Møldrup Jakobsen, Per Michael Larsen, Kjersti Kristin Lindblad, Flemming Møller, Annette Slyngborg, Yousif Subhi, Line Kessel   +9 more
wiley   +1 more source

Prevalence and profile of astigmatism in individuals availing ophthalmic services at Central Regional Referral Hospital, Gelephu, Bhutan: A cross-sectional, hospital-based study

Bhutan Health Journal
Introduction: Astigmatism has been defined as a type of refractive error when parallel rays of light entering the eye are not focused at one point of the retina when accommodation is at rest due to irregular curvature of the cornea or lens surface.
Sangay Choden, Tshering Jamtsho, Indra P Sharma   +2 more
doaj   +1 more source

Comparison of the effectiveness of visual acuity measurements for amblyopia screening at the age of 36 and 45 months and difference in severity of amblyopia detected

Acta Ophthalmologica, EarlyView.
Abstract Purpose Efficiency of visual screening using visual acuity measurement (VAM) in children screened at 45 months of age (45 m) and screened at both 36 months of age (36 m) and 45 m was investigated by determining failure, repeat and referral rates and amblyopia detection.
M. A. J. Telleman, F. Sloot, S. J. Benjamins, Angelie Kroon, Karin Visser, Anneke Schoonenberg, Wilma van den Berg, Gerdien Verheij, Linda Lokhorst, Esmeralda Visser, Xanne Slot, Japke van Dijk, Cindy Scholten, Christine Bos‐Koelewijn, Marijke de Graaf‐Helfensteijn, Carina Wijkmans, Nilofar Sultanali, Jorien Schouten, Linda Boon, Alice de Graaf, Mirjam Peeters, Inge van Aggelen, Imke Westra‐Postma, Jacqueline Bos, Hanneke Evers, Annemiek Bennen, Marijke Hoekstra, Wijnanda Asjes, Elfi Dijkers, Ruth Boer, Tamara Alteveer, Dina Schram‐Rienstra, Jolanda Timmer‐de Kok, Tineke Hoolsema‐Greving, Friedel van Ketwich‐Godfroy, Liesbeth Steenbergen, Mari Gutter, Josine Arentzen, Marike Heuveling‐Rijswijk, Heleen van Andel, Marieke van Dijk, Elsa Lieverse, Marijke de Jongh‐van den Tweel, Jolanda de Vries, S. E. Loudon, B. Spek, H. J. Simonsz, Orthoptic Research Group   +47 more
wiley   +1 more source