Results 11 to 20 of about 330,519 (320)

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, Foteinopoulou, Garcia, Gomez-Santos, Grzegorczyk, Hailu Luo, Haiying Liu, Hooft, Houck, Hu, Jing Zhu, Lindel, Liu, Luo, Notomi, Pacheco, Parazzoli, Pendry, Pendry, Pendry, Pendry, Shelby, Smith, Smith, Smith, Smith, Smith, Valanju, Valanju, Veselago, Wei Hu, Williams, Xunong Yi, Yariv, Zhang   +34 more
core   +2 more sources

Evaluation of Barrett universal II formula for intraocular lens power calculation in Asian Indian population

Indian Journal of Ophthalmology, 2020
Purpose: Barrett Universal II (BU-II) is considered as one of the most accurate intraocular lens (IOL) power calculation formulas; however, there is no literature studying the same in Indian population.
Nikhil Kuthirummal, Murugesan Vanathi, Ritika Mukhija, Noopur Gupta, Rachna Meel, Rohit Saxena, Radhika Tandon   +6 more
doaj   +1 more source

Comparison of visual performance recovery after thin-flap LASIK with 4 femtosecond lasers [PDF]

International Journal of Ophthalmology, 2017
AIM: To compare the speed of visual recovery following myopic thin-flap LASIK with four femtosecond lasers. METHODS: Eighty-eight eyes of 46 patients who were consecutively scheduled for bilateral LASIK with the IntraLase FS60 (Group 1), Femto LDV ...
Jing Zhang, Yue-Hua Zhou, Yan Zheng, Qian Liu   +3 more
doaj   +1 more source

Effect of Capsular Tension Ring Implantation during Phacoemulsification on Postoperative Refraction

Oftalʹmologiâ, 2022
Purpose. To assess refractive result of phacoemulsification (PE) with capsular tension ring (CTR) implantation.Patients and methods. In total, 37 eyes of 37 patients who underwent PE with intraocular lens (IOL) implantation were divided into 2 groups ...
D. F. Belov, V. P. Nikolaenko
doaj   +1 more source

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

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, J. S. Derov, J. Sokoloff, K. Sakoda, N.-C. Panoiu, P. V. Parimi, P. Vodo, S. Sridhar, V. Veselago, W. T. Lu   +9 more
core   +1 more source

Refractive errors [PDF]

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, Christina, Kraus, Peter, Baumbach, Judith, Ungewiß, Ralf, Michels   +4 more
openaire   +2 more sources

Assessment of the Clinical Effectiveness of DRL Orthokeratology Lenses vs. Single-Vision Spectacles in Controlling the Progression of Myopia in Children and Teenagers: 2 Year Retrospective Study

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, Pauline Beaujeux, Louisette Bloise, Aurélia Chaume, Jean Philippe Colliot, Dominique Plaisant Proust, Perrine Rossi, Bertrand Tritsch, Dominique Bastien Crinon, Jaume Pauné   +9 more
doaj   +1 more source

Autorefraction, Retinoscopy, Javal’s Rule, and Grosvenor’s Modified Javal’s Rule: The Best Predictor of Refractive Astigmatism

Journal of Ophthalmology, 2016
The aim of the study was to determine the level of agreement between Javal’s rule, autorefraction, retinoscopy, and refractive astigmatism and to determine which technique is the most suitable substitute when subjective refraction is not applicable using
Kofi Asiedu, Samuel Kyei, Emmanuel Ekow Ampiah   +2 more
doaj   +1 more source

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, Jürgen Kästel, Michael Fleischhauer, Ronald L. Walsworth, Susanne F. Yelin   +4 more
core   +2 more sources