Results 21 to 30 of about 118,093 (308)
Critique of optical negative refraction superlensing [PDF]
, 2011 Has the ten-year old quest for the optical superlens, based on Veselago’s hypothesis of negative refraction, been a chimera? We argue that Pendry’s alternative prescription of the silver superlens is nothing more than an application of the natural ...
Christou, George +3 more
core +1 more source
Ray-optical refraction with confocal lenslet arrays [PDF]
, 2008 Two parallel lenslet arrays with focal lengths f1 and f2 that share a common focal plane (that is, which are separated by a distance f1+f2) can refract transmitted light rays according to Snell's law, but with the 'sin's replaced with 'tan's. This is the
Courtial, J.
core +1 more source
Using microwave refraction to determine local inhomogeneities of a rotating plasma
Nukleonika, 2023 To determine the local inhomogeneities of a rotating plasma, the method based on microwave refraction was used. The method is based on spectral and correlation analysis of the reflected signals from the rotating plasma layer at normal and inclined ...
Martseniuk Yurii P. +2 more
doaj +1 more source
Indian Journal of Ophthalmology, 2021 Purpose: To develop predictive models to identify cataract surgery patients who are more likely to benefit from refraction at a four-week postoperative exam. Methods: In this retrospective study, we used data of all 86,776 cataract surgeries performed in
Sachin Gupta +3 more
doaj +1 more source
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
Depth perception on fundus images using a single-channel stereomicroscopy
Journal of Innovative Optical Health Sciences, 2021 Typical fundus photography produces a two-dimensional image. This makes it difficult to observe the microvascular and neural abnormalities, because the depth of the image is missing. To provide depth appreciation, we develop a single-channel stereoscopic
Edalat Radfar +4 more
doaj +1 more source
Topography-modified refraction: adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK [PDF]
, 2017 Noel Alpins1,2 1NewVision Clinics, Melbourne, VIC, Australia; 2Department Ophthalmology, Melbourne University, Melbourne, VIC, Australia It is encouraging to see the results in the article by Kanellopoulos “Topography-modified refraction (TMR)
Alpins N, Alpins, N, Noel Alpins
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Wave scattering by small bodies and creating materials with a desired refraction coefficient [PDF]
, 2011 In this paper the author’s invited plenary talk at the 7-th PACOM (Pan African Congress of Mathematicians), is presented. Asymptotic solution to many-body wave scattering problem is given in the case of many small scatterers. The small scatterers can be
Alexander G. Ramm, Ramm, Alexander G.
core +1 more source
Taiwan Journal of Ophthalmology, 2020 PURPOSE: There is a need to understand the requirement for the post-mydriatic test (PMT) among adults for the final prescription of spectacles as this test increases the cost of eye care and causes inconvenience to the patient because of the additional ...
Nagarajan Theruveethi +2 more
doaj +1 more source
A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light
Sensors, 2018 Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow
Wei Liu +5 more
doaj +1 more source