Results 81 to 90 of about 5,505 (209)

Status of the PALM-3000 high-order adaptive optics system [PDF]

, 2009
The PALM-3000 upgrade to the Palomar Adaptive Optics system on the 5.1 meter Hale telescope will deliver extreme adaptive optics correction in near-infrared wavelengths and diffraction-limited images in visible wavelengths.
Angione, John R., Baranec, Christoph, Bouchez, Antonin H., Bui, Khanh, Burruss, Rick S., Crepp, Justin R., Cromer, John L., Croner, Ernest E., Dekany, Richard G., Guiwits, Stephen R., Hale, David D. S., Henning, John R., Palmer, Dean, Roberts, Jennifer E., Troy, Mitchell, Truong, Tuan N., Zolkower, Jeffry   +16 more
core   +1 more source

Improved shift estimates on extended Shack–Hartmann wavefront sensor images [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
7 pages, 7 ...
Townson, M. J., Kellerer, A., Saunter, C. D.   +2 more
openaire   +4 more sources

Effect of 0.025% atropine on ocular biometry changes during accommodation

Ophthalmic and Physiological Optics, Volume 45, Issue 3, Page 865-876, May 2025.
Abstract Purpose Low concentration atropine is an effective treatment to slow myopia progression and axial elongation and also reduces accommodation. On‐axis ocular dimensions of the eye change during accommodation; hence, this study aimed to quantify the effect of 0.025% atropine eye drops on accommodation‐induced changes in ocular biometry.
Rohan P. J. Hughes, Emily C. Woodman‐Pieterse, Scott A. Read, Stephen J. Vincent, Michael J. Collins   +4 more
wiley   +1 more source

Spectral characterization of optical aberrations in fluidic lenses

Frontiers in Physics
We report an extensive numerical study and supporting experimental results on the spectral characterization of optical aberrations in macroscopic fluidic lenses with tunable focal distance and aperture shape.
Graciana Puentes, Graciana Puentes, Fernando Minotti, Fernando Minotti   +3 more
doaj   +1 more source

A metric‐based image‐formation model explains the improvement in subjective refraction using temporal defocus waves

Optometry and Vision Science, Volume 102, Issue 4, Page 196-203, April 2025.
SIGNIFICANCE Direct subjective refraction (DSR) is a novel method for refractive error measurements that uses temporal changes in defocus and a flicker minimization task. The computational models developed here are a framework for improving this clinical method.
Victor Rodriguez‐Lopez, Carlos Dorronsoro, Alberto de Castro   +2 more
wiley   +1 more source

Simultaneously measuring ocular aberration and anterior segment biometry during accommodation [PDF]

Journal of Innovative Optical Health Sciences, 2015
In the human eye, accommodation is essential for functional vision. However, the mechanisms regulating accommodation and the ocular parameters affecting aberrations remain to be explored.
Yuanyuan Wang, Yilei Shao, Yimin Yuan
doaj   +1 more source

Wavefront sensing with a brightest pixel selection algorithm

, 2011
Astronomical adaptive optics systems with open-loop deformable mirror control have recently come on-line. In these systems, the deformable mirror surface is not included in the wavefront sensor paths, and so changes made to the deformable mirror are not ...
A. G. Basden, Basden, Basden, E. Gendron, Foy, Gendron, Gendron, Lardière, Marchetti, Masciadri, Myers, R. M. Myers, Roddier, Simonich, Tatarski, Thomas, Thomas   +16 more
core   +2 more sources

Review and experimental comparison of speckle‐tracking algorithms for X‐ray phase contrast imaging

Journal of Synchrotron Radiation, Volume 32, Issue 1, Page 180-199, January 2025.
This review focuses on low‐dose near‐field X‐ray speckle phase imaging in the differential mode introducing the existing algorithms with their specifications and comparing their performances under various experimental conditions.X‐ray speckles have been used in a wide range of experiments, including imaging (and tomography), wavefront sensing, spatial ...
Rafael Celestre, Laurène Quénot, Christopher Ninham, Emmanuel Brun, Luca Fardin   +4 more
wiley   +1 more source

Sources of reduced visual acuity and spectacle treatment options for individuals with Down syndrome: Review of current literature

Ophthalmic and Physiological Optics, Volume 44, Issue 7, Page 1326-1345, November 2024.
Abstract Individuals with Down syndrome are known to have a greater prevalence of ocular conditions such as strabismus, nystagmus, elevated refractive error, poor accommodative function, elevated higher‐order optical aberrations and corneal abnormalities.
Heather A. Anderson
wiley   +1 more source

SAOLIM, a prototype of a low cost System for Adaptive Optics with Lucky Imaging

, 2010
A prototype of a low cost Adaptive Optics (AO) system has been developed at the Instituto de Astrofisica de Andalucia (CSIC) and tested at the 2.2m telescope of the Calar Alto observatory.
Aceituno, F. J., Aceituno, J., Ortiz, J. L., Sanchez, S. F.   +3 more
core   +1 more source