Results 31 to 40 of about 61,783 (227)

Nonlocal conservation laws of the constant astigmatism equation

open access: yes, 2016
For the constant astigmatism equation, we construct a system of nonlocal conservation laws (an abelian covering) closed under the reciprocal transformations.
Hlaváč, Adam, Marvan, Michal
core   +1 more source

Posterior corneal surface stability after femtosecond laser-assisted keratomileusis [PDF]

open access: yes, 2015
The purpose of this study was to evaluate posterior corneal surface variation after femtosecond laser-assisted keratomileusis in patients with myopia and myopic astigmatism. Patients were evaluated by corneal tomography preoperatively and at 1, 6, and 12
Cagini, Carlo   +6 more
core   +3 more sources

Changes in astigmatism after horizontal muscle recession strabismus surgery: A retrospective cohort study

open access: yesIndian Journal of Ophthalmology, 2021
Purpose: The aim of this study was to evaluate the changes in astigmatism after unilateral recession of horizontal rectus muscles in pediatric patients.
Christina Karakosta   +7 more
doaj   +1 more source

Lyot-based Low Order Wavefront Sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its Laboratory Performance

open access: yes, 2014
High throughput, low inner working angle (IWA) phase masks coronagraphs are essential to directly image and characterize (via spectroscopy) earth-like planets.
Baudoz, Pierre   +7 more
core   +2 more sources

Higher order Laguerre-Gauss mode degeneracy in realistic, high finesse cavities [PDF]

open access: yes, 2011
Higher order Laguerre-Gauss (LG) beams have been proposed for use in future gravitational wave detectors, such as upgrades to the Advanced LIGO detectors and the Einstein Telescope, for their potential to reduce the effects of the thermal noise of the ...
A. Freise   +9 more
core   +3 more sources

Contribution of Posterior Corneal Astigmatism to Total Corneal Astigmatism in a Sample of Egyptian Population

open access: yesClinical Ophthalmology, 2020
Mohamed Hosny, Alaa Badawy, Lobna Khazbak, Mohamed Anis, Sarah Azzam Ophthalmology, Cairo University, Giza, EgyptCorrespondence: Mohamed HosnyOphthalmology, Cairo University, 84 Shehab Street, Mohandeseen, Giza 12411, EgyptTel +20 1000007675Email ...
Hosny M   +4 more
doaj  

Comparison of penetrating femtosecond laser-assisted astigmatic keratotomy and toric intraocular lens implantation for correction of astigmatism in cataract surgery

open access: yesScientific Reports, 2021
This study tried to compare the clinical outcomes of femtosecond laser-assisted astigmatic keratotomy (FSAK) and toric intraocular lens (IOL) implantation for astigmatism correction and identify factors affecting the efficacy of FSAK and toric IOL ...
Hoon Noh   +4 more
doaj   +1 more source

Nanoscale Spatial Organization of ARC High‐ and Low‐Order Assemblies at Excitatory Synapses

open access: yesAdvanced Science, EarlyView.
ARC (Activity‐Regulated Cytoskeleton‐Associated protein) mediates synaptic plasticity by forming nanoscale assemblies in neurons. Using super‐resolution microscopy and time‐resolved anisotropy with targeted tagging, the study reveals low‐order ARC assemblies at synapses colocalizing with AMPARs, semi‐circular structures at endocytic zones, and 60–80 nm
Martina Damenti   +13 more
wiley   +1 more source

Surgical approaches to correct corneal astigmatism at time of cataract surgery: a mini-review [PDF]

open access: yesInternational Journal of Ophthalmology
Among refractive errors, astigmatism is the most common optical aberration, where refraction changes in different meridians of the eye. It causes blurred vision at any distance and includes corneal, lenticular, and retinal astigmatism.
Xiao-Lei Yin   +4 more
doaj   +1 more source

Long-term outcomes of cataract surgery with toric intraocular lens implantation by the type of preoperative astigmatism

open access: yesScientific Reports, 2022
Surgical outcomes of toric intraocular lens (IOL) implantation for 8 years after surgery were analyzed. Data were retrospectively collected in 176 eyes of 176 patients before and 1 month, 1, 3, 5, and 8 years after phacoemulsification and implantation of
Tetsuro Oshika   +9 more
doaj   +1 more source

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