Results 51 to 60 of about 154,766 (375)
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
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
Single conjugate adaptive optics for the ELT instrument METIS [PDF]
, 2018 The ELT is a 39m large, ground-based optical and near- to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade.
Absil, Olivier +9 more
core +3 more sources
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
Flow structure and optical beam propagation in high-Reynolds-number gas-phase shear layers and jets [PDF]
, 2001 We report on the structure of the scalar index-of-refraction field generated by turbulent, gas-phase, incompressible and compressible shear layers and incompressible jets, and on associated beam-propagation aero-optical phenomena.
Catrakis, H. J. +2 more
core +1 more source
Pyramid wavefront sensor optical gains compensation using a convolutional model [PDF]
Astronomy & Astrophysics, 2020 Context. Extremely large telescopes are overwhelmingly equipped with pyramid wavefront sensors (PyWFS) over the more widely used Shack–Hartmann wavefront sensor to perform their single-conjugate adaptive optics (SCAO) mode.
V. Chambouleyron +7 more
semanticscholar +1 more source
Quasi-static aberrations induced by laser guide stars in adaptive optics [PDF]
, 2006 Laser Guide Star Adaptive Optics (LGS AO) systems use the return from an artificial guide star to measure the wavefront aberrations in the direction of the science object.
Bouchez, Antonin H. +3 more
core +1 more source
Deep learning wavefront sensing.
Optics Express, 2019 We present a new class of wavefront sensors by extending their design space based on machine learning. This approach simplifies both the optical hardware and image processing in wavefront sensing.
Yohei Nishizaki +6 more
semanticscholar +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