Results 21 to 30 of about 109,414 (323)
Numerical treatment of the light propagation problem in the post-Newtonian formalism [PDF]
, 2009 The geometry of a light wavefront, evolving from a initial flat wavefront in the 3-space associated with a post-Newtonian relativistic spacetime, is studied numerically by means of the ray tracing method.
Miguel, A. San +2 more
core +1 more source
Centre Symmetry Sets of Families of Plane Curves
Demonstratio Mathematica, 2015 We study centre symmetry sets and equidistants for a I-parameter family of plane curves where, for a special member of the family, there exist two inflexions with parallel tangents.
Giblin Peter, Reeve Graham
doaj +1 more source
A Demonstration of Wavefront Sensing and Mirror Phasing from the Image Domain [PDF]
, 2014 In astronomy and microscopy, distortions in the wavefront affect the dynamic range of a high contrast imaging system. These aberrations are either imposed by a turbulent medium such as the atmosphere, by static or thermal aberrations in the optical path,
Cheetham, Anthony +5 more
core +2 more sources
A review of higher order aberrations of the human eye
African Vision and Eye Health, 2019 Background: This literature review is part of a research study for aberration-correcting soft contact lenses, where wavefront aberrometry was utilised.
Ayesha Suliman, Alan Rubin
doaj +1 more source
Optical Aberrations and Wavefront
Türk Oftalmoloji Dergisi, 2014 The deviation of light to create normal retinal image in the optical system is called aberration. Aberrations are divided two subgroup: low-order aberrations (defocus: spherical and cylindrical refractive errors) and high-order aberrations (coma ...
Nihat Polat +2 more
doaj +1 more source
Journal of the European Optical Society-Rapid Publications, 2022 The classic equation for decomposing the wavefront aberrations of axis-symmetrical optical systems has the form, W ( h 0 , ρ , ϕ ) = ∑ j = 0 ∝ ∑ p = 0 ∝ ∑ m = 0 ∝ C 2 j + m 2 p + m m ( h 0 ...
Lin Psang
doaj +1 more source
Ground-layer wavefront reconstruction from multiple natural guide stars [PDF]
, 2007 Observational tests of ground layer wavefront recovery have been made in open loop using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona.
Athey A. +17 more
core +3 more sources
Evolution of refractive surgeries
Muller Journal of Medical Sciences and Research, 2017 The use of surgical procedures to correct refractive errors of the eye has come a long way. The two main types are corneal procedures and intraocular procedures.
Madhurima K Nayak
doaj +1 more source
Reflective Focusing Based on Few-Layer Gradient Metasurface Element Array
Frontiers in Physics, 2020 This study proposes a three-layer focusing gradient metasurface for wavefront processing. The structure works in the frequency range of 15–25 GHz and has a central frequency of 19.6 GHz.
Mengyao Yan +4 more
doaj +1 more source
Optical Bench Analysis of 2 Depth of Focus Intraocular Lenses
Biomedicine Hub, 2021 Background: The aim of the study was to analyze the objective optical properties of 2 enhanced depth of focus (EDoF) intraocular lenses (IOLs) using optical bench analysis.
Andreas F. Borkenstein +3 more
doaj +1 more source