Results 21 to 30 of about 2,756,584 (366)

Comparison of the optical quality after SMILE and FS-LASIK for high myopia by OQAS and iTrace analyzer: a one-year retrospective study

BMC Ophthalmology, 2021
Background To compare the correction effect and optical quality after small-incision lenticule extraction (SMILE) and femtosecond laser assisted laser in situ keratomileusis (FS-LASIK) for high myopia.
Yewei Yin, Ying Lu, Aiqun Xiang, Yanyan Fu, Yang Zhao, Yuanjun Li, Tu Hu, Kaixuan Du, Shengfa Hu, Qiuman Fu, Xiaoying Wu, Dan Wen   +11 more
doaj   +1 more source

Design, Fabrication and Analysis of a Hybrid-Order Monolithic Imaging Diffractive Lens on a Germanium Substrate

Micromachines, 2023
Diffractive optical elements are gradually replacing some conventional optical elements and becoming a key component of optical systems due to their unique phase modulation function.
Yidi Zheng, Boping Lei, Bin Fan, Junfeng Du, Jiang Bian, Lihua Wang, Yuchen Liu, Shanghong Guan, Dun Liu, Qian Luo, Hu Yang, Hao Zhang, Chao Hu   +12 more
doaj   +1 more source

Optical Aberration Correction via Phase Diversity and Deep Learning

bioRxiv, 2020
In modern microscopy imaging systems, optical components are carefully designed to obtain diffraction-limited resolution. However, live imaging of large biological samples rarely attains this limit because of sample induced refractive index ...
A. Krishnan, C. Belthangady, Clara Nyby, Merlin Lange, Bin Yang, Loic A. Royer   +5 more
semanticscholar   +1 more source

First- and third-order chromatic aberrations in Glaser magnetic lens for object magnetic immersion

Heliyon, 2023
In this paper, the Gaussian optical properties and the first- and third-order isotropic and anisotropic chromatic aberrations of the Glaser magnetic lens have been derived analytically and then calculated numerically based on two methods: the ...
Aymen Amer, Ahmad K. Ahmad
doaj   +1 more source

Polarization Aberration of a Non-Rotationally Symmetric Optical System With Freeform Surfaces

IEEE Access, 2021
Owing to the wide application of freeform surfaces in off-axis optical systems with large apertures, large fields of view, and long focus distances, the polarization effects caused by non-rotationally symmetrical surfaces have a significant impact on the
Yilan Zhang, Haodong Shi, Huilin Jiang
doaj   +1 more source

Complex-Amplitude-Modulation Vectorial Excitation Beam for High-Resolution Observation of Deep Regions in Two-Photon Microscopy

Frontiers in Neuroscience, 2022
In two-photon microscopy, aberration correction is an essential technique for realizing high resolution in deep regions. A spatial light modulator (SLM) incorporated into an optical system for two-photon microscopy performs pre-compensation on the ...
Naoya Matsumoto, Koyo Watanabe, Alu Konno, Alu Konno, Takashi Inoue, Shigetoshi Okazaki   +5 more
doaj   +1 more source

Chromatic aberration and spectral dependency of extended-range-of-vision intraocular lens technology

Scientific Reports, 2023
This study compared the optical quality and chromatic performance of refractive-diffractive intraocular lenses (IOLs) that are designed to extend the range of vision of pseudophakic patients and alter chromatic aberration.
Grzegorz Łabuz, Weijia Yan, Isabella D. Baur, Ramin Khoramnia, Gerd U. Auffarth   +4 more
doaj   +1 more source

Design of a Large Field of View and Low-Distortion Off-Axis Optical System Based on a Free-Form Surface

Photonics, 2023
Free-form surfaces have good aberration correction capability and balance capability for nonrotationally symmetric imaging systems. In this study, we analyzed the quantitative relationship between X–Y polynomial combination and aberration for the ...
Bing Jia, Yubing Li, Qiongying Lv, Fan Jin, Chunlin Tian   +4 more
doaj   +1 more source

A Do-It-Yourself Hyperspectral Imager Brought to Practice with Open-Source Python

Sensors, 2021
Commercial hyperspectral imagers (HSIs) are expensive and thus unobtainable for large audiences or research groups with low funding. In this study, we used an existing do-it-yourself push-broom HSI design for which we provide software to correct for ...
Kimmo Aukusti Riihiaho, Matti Aleksanteri Eskelinen, Ilkka Pölönen   +2 more
doaj   +1 more source

Study of the dynamic tear film aberrations using a curvature sensing setup [PDF]

, 2006
The advancement in adaptive optics in recent years has increased the interest in the dynamic aberrations of the eye, including those introduced by the first optical surface provided by the tear film.
Gruppetta, S., Lacombe, F., Puget, P.
core   +3 more sources