Results 11 to 20 of about 257,877 (269)
Ocular Refraction at Birth and Its Development During the First Year of Life in a Large Cohort of Babies in a Single Center in Northern Italy [PDF]
, 2020 The purpose of this study was to investigate refraction at birth and during the first year of life in a large cohort of babies born in a single center in Northern Italy.
Bartollino S. +7 more
core +1 more source
Dark solitons at nonlinear interfaces [PDF]
, 2010 The refraction of dark solitons at a planar boundary separating two defocusing Kerr media is simulated and analyzed, for the first time (to our knowledge). Analysis is based on the nonlinear Helmholtz equation and is thus valid for any angle of incidence.
Aceves +31 more
core +2 more sources
Refraction problems after refractive surgery
Survey of Ophthalmology, 1988 While refractive surgery such as radial keratotomy, epikeratophakia, and corneal relaxing incisions offer many potential benefits to patients, they can also generate optical problems such as overcorrection or undercorrection of the prior refractive error and variable vision.
Dean McGee Eye Institute, University of Oklahoma, Oklahoma City, Oklahoma, USA ( host institution ) +2 more
openaire +3 more sources
Negative Refraction and Left-handed electromagnetism in Microwave Photonic Crystals [PDF]
, 2004 We demonstrate negative refraction of microwaves in metallic photonic crystals. The spectral response of the photonic crystal, which manifests both positive and negative refraction, is in complete agreement with band-structure calculations and numerical ...
E. Cubukcu +9 more
core +1 more source
Amphoteric refraction at the interface between isotropic and anisotropic media [PDF]
, 2006 It is found that the amphoteric refraction, i.e. the refraction can be either positive or negative depending on the incident angles, could occur at a planar interface associated with a uniaxially anisotropic positive index media (PIM) or an anisotropic ...
Feise +34 more
core +2 more sources
What are the left-handed media and what is interesting about them? [PDF]
, 2004 We review the intensively discussed ideas about wave propagation and refraction in media where both electric permittivity and magnetic permeability are negative. The criticism against negative refraction as violating the causality principle is considered.
Bliokh, K. Yu., Bliokh, Yu. P.
core +1 more source
Deutsches Ärzteblatt international, 2016 All over the world, refractive errors are among the most frequently occuring treatable distur - bances of visual function. Ametropias have a prevalence of nearly 70% among adults in Germany and are thus of great epidemiologic and socio-economic relevance.In the light of their own clinical experience, the authors review pertinent articles retrieved by a
Ulrich, Schiefer +4 more
openaire +2 more sources
Tunable negative refraction without absorption via electromagnetically induced chirality [PDF]
, 2007 We show that negative refraction with minimal absorption can be obtained by means of quantum interference effects similar to electromagnetically induced transparency.
D. M. Cook +4 more
core +2 more sources
Children, 2023 The purpose of this study was to assess the effect of orthokeratology treatment with DRL lenses on the control of myopia progression compared with single vision glasses users (monofocal glasses).
António Queirós +9 more
doaj +1 more source
British Journal of Ophthalmology, 1999 This article presents an overview of the terms used in laser refractive surgery and identifies the benefits, outcomes, complications and shortcomings of these procedures. Even though it is 'fashionable' to have these procedures done, they are still largely experimental. Although there are benefits from these procedures, thorough screening and selection
openaire +4 more sources