Results 61 to 70 of about 43,431 (244)
Journal of Ophthalmology, 2022 Background. The prevalence of corneal astigmatism in patients with cataract has not been well documented in both rural and urban areas of Indian population. Purpose. The aim of this study was to assess prevalence of corneal astigmatism before cataract
C. Kumar Amruth +2 more
doaj +1 more source
The Relation Between Corneal and Total Astigmatism [PDF]
, 1996 Using computer-assisted videokeratoscopy we measured corneal astigmatism and compared these results over a range of corneal zone diameters with total ocular astigmatism derived by subjective refraction.
Van Saarloos, Paul P. +4 more
core
Diffraction‐Free Natural Optical Skyrmions and Their Subwavelength Confinement Around Vortices
Laser &Photonics Reviews, EarlyView.ABSTRACT Diffraction causes waves to spread out as they propagate freely. The tighter the lateral confinement, the faster the spreading. Past research on how to suppress diffraction has been based on wave engineering and has led so far to idealized waves that, in real settings, eventually diffract.
Nilo Mata‐Cervera +4 more
wiley +1 more source
Delicate balance: relationship between internal astigmatism and lens astigmatism
, 2021 Due to the lack of equipment for directly measuring crystal morphology, there are few researches on crystal astigmatism.The purpose of this study was to accurately explore the correlation between internal astigmatism and lens astigmatism in patients with
Guimei Zhou +5 more
core +2 more sources
Tolerance to residual astigmatism of an isofocal intraocular lens
, 2023 Received 08 June 2023; Revised 12 October 2023; Accepted 23 October 2023; Published 11 November 2023; Issue Date April 2024. This study was funded by the Spanish Agencia Estatal de Investigación (grant number PID2020-114582RB-I00/AEI/10.13039 ...
Cuellar, Fátima +10 more
core +1 more source
Calibration‐Free Single‐Frame Super‐Resolution Fluorescence Microscopy
Laser &Photonics Reviews, EarlyView.A deep learning framework reconstructs super‐resolved fluorescence images from a single dense camera frame, without any prior calibration or knowledge of the microscope. Trained solely on synthetic data, it generalizes across imaging setups and conditions.
Anežka Dostálová +3 more
wiley +1 more source
Age- and gender-related characteristics of astigmatism in a myopic population
Frontiers in Medicine, 2022 PurposeTo explore age- and gender-related differences of refractive and corneal astigmatism in myopic patients looking for refractive surgery.DesignA retrospective cross-sectional study.Materials and methodsThe medical files of candidates looking for ...
Shan Yang, Yang Jiang, Ge Cui, Ying Li
doaj +1 more source
Some Observation on Astigmatism [PDF]
Southern Medical Journal, 1919 Remarks on the terminology of astigmatism especially direct and inverse, and on the frequency of the latter, with discussion of practical points in dealing with astigmatism. With three charts. Read before the American Academy of Ophthalmology and Oto-Laryngology, August 6th, 1918.
Green, John, Hardy, William F.
openaire +4 more sources
Characteristics of surgically induced astigmatism after standardized microincisional cataract surgery with a superior limbal incision. [PDF]
, 2023 PURPOSE To determine 1) if measurements of surgically induced astigmatism (SIA) as measured by keratometry (K) and total keratometry (TK) differ 2) if SIA affects the magnitude and/or meridian of keratometric astigmatism 3) if SIA evolves over time.
Bolz, Matthias +17 more
core +2 more sources
Med Research, EarlyView.The AI‐enabled multimodal framework for whole‐life myopia management. Graphical abstract illustrates the transition of myopia care from premyopia to myopia, high myopia, and pathologic myopia. Multimodal data, including demographic and refractive information, genetic, behavioral and environmental factors, ophthalmic imaging, and omics profiles, can be ...
Zewei Zhang +6 more
wiley +1 more source