Results 81 to 90 of about 470 (166)

Optics of photorefraction: orthogonal and isotropic methods.

, 1982
Analysis of the optics of photorefractively computed ray tracing shows that, for short camera-to-subject distances, the function relating image size to defocus of the eye is not symmetrical for errors of focus in front of and behind the camera.
Howland, B, Bradford Howland, Oliver Braddick, Braddick, O, Howard C. Howland, Atkinson, J, Howland, HC, Janette Atkinson   +7 more
core   +1 more source

Photorefractive reservoir computing

Optics Letters
Reservoir computing (RC) is a machine learning (ML) framework that has gained attention in recent years as the interest in alternative computing paradigms has grown. RC allows the utilization of physical systems to solve ML tasks. We demonstrate the use of the nonlinear photorefractive reservoir computer and perform tasks requiring both nonlinearity ...
Alveteg, Sebastian, Sciamanna, Marc, Fuerbach, Alex, Wolfersberger, Delphine   +3 more
openaire   +3 more sources

Eccentric photorefraction: optical analysis and empirical measures.

, 1985
An optical analysis of a photographic technique, "eccentric photorefraction," designed to measure refraction and accommodative states along a single meridian of the eye, is presented.
Bobier, WR, Braddick, Oliver
core  

Stable tuning of photorefractive micro-cavities using an auxiliary laser

, 2020
Cavity nonlinear optics enables intriguing physical phenomena to occur at micro- or nano-scales with modest input powers. While this enhances capabilities in applications such as comb generation, frequency conversion and quantum optics, undesired ...
Juanjuan Lu (2555170), Hong X. Tang (1535218), Yuntao Xu (4588030), Joshua B. Surya (11273936)   +3 more
core   +1 more source

Accommodation and pupil responses to random-dot stereograms

Journal of Optometry, 2016
We investigated the dynamics of accommodative and pupillary responses to random-dot stereograms presented in crossed and uncrossed disparity in six visually normal young adult subjects (mean age = 25.8 ± 3.1 years).
Rajaraman Suryakumar, Robert Allison
doaj   +1 more source

Calibration and validation the Dynamic Photorefraction System (DPRS) [PDF]

, 2014
Introduction: Our group has been measuring accommodation in myopic children. The instrument of choice has been the Power Refractor (Multichannel Systems). However, this instrumentation is no longer supported and runs on an outdated platform (Windows 98).
Labhishetty, Vivek
core  

Application of the three-valence model of photorefraction to rhodium-doped barium titanate

, 2003
Small signal and light induced absorption data taken at 633 nm and 1.06 ?m for different samples of rhodium-doped barium titanate (Rh : BaTiO3) have been analysed.
Damzen, MJ, Damzen, M.J., Corner, L., Corner, L, Kaczmarek, M., Kaczmarek, M   +5 more
core   +1 more source

Photorefraction Screens Millions for Vision Disorders

, 2008
Who would have thought that stargazing in the 1980s would lead to hundreds of thousands of schoolchildren seeing more clearly today? Collaborating with research ophthalmologists and optometrists, Marshall Space Flight Center scientists Joe Kerr and the ...

core  

Photorefraction in Polymers [PDF]

علوم و تکنولوژی پلیمر, 1996
H. Khoshsima, H. Tajalli, A. A. Entezami
doaj   +1 more source

Improvement of the photorefractive response in bismuth and magnesium co-doped lithium niobate crystals via oxygen-vacancy modulation through controlled redox annealing

Frontiers in Physics
In this study, bismuth (Bi) and magnesium (Mg) co-doped lithium niobate crystals (LN:Bi,Mg6.0) with a rapid photorefractive (PR) response were subjected to annealing treatments in oxygen and various argon atmospheres to modulate their oxidation-reduction
Shuolin Wang, Weiwei Wang, Yuqi Zhang, Youyou Hu, Dahuai Zheng, Hongde Liu, Yongfa Kong   +6 more
doaj   +1 more source