Article
Nanoscience & Nanotechnology
Jung-Hwan Song, Jorik van de Groep, Soo Jin Kim, Mark L. Brongersma
Summary: The article discusses high-Q, non-local metasurfaces with independent functions across different wavelength bands, and how this technology can be used for flat optical elements in eye tracking applications.
NATURE NANOTECHNOLOGY
(2021)
Article
Optics
Zhisheng Zhou, Qiang Fu, Jingang Zhang, Yunfeng Nie
Summary: Proper initialization of nonlinear optimization is crucial to prevent local minima in phase diversity wavefront sensing. A neural network based on low-frequency coefficients in the Fourier domain has been effective in estimating unknown aberrations. However, its generalization ability is weak due to reliance on specific training settings. This study proposes a generalized Fourier-based PDWS method by combining an object-independent network with a system-independent image processing procedure. Experimental results demonstrate the applicability of a trained network to images with different settings.
Article
Medicine, General & Internal
Linlu Tian, Peiquan Zhao, Huang Zhu, Xiaoli Kang, Yan Wei, Luya Chen, Jing Li
Summary: This study investigated the accuracy and applicability of a vergence formula for estimating the refractive status of pediatric eyes with aphakia. The results showed that the vergence formula was effective in evaluating the refractive status of these eyes.
FRONTIERS IN MEDICINE
(2022)
Article
Optics
Chunming Jiang, Dong Yao, Lingtong Meng, Chunhui Yan, Honghai Shen
Summary: Polarization remote sensing technology modifies the polarization information of the target through modulation by the optical system. Adding a lens group combined with mirrors effectively suppresses polarization aberrations, resulting in reduced diattenuation and retardance values, as well as corrected polarization cross-coupled energy.
Article
Biochemical Research Methods
Dibyendu Pusti, Chloe Degre Kendrick, Yifei Wu, Qiuzhi Ji, Hae Won Jung, Geunyoung Yoon
Summary: The quantitative evaluation of peripheral ocular optics is crucial for myopia research and studying visual performance in individuals with normal and compromised central vision. We have developed a widefield scanning wavefront sensor (WSWS) that can scan along any retinal meridian while maintaining natural central fixation. The WSWS utilizes a unique scanning method involving a motorized rotary stage and a goniometer to scan horizontally and vertically, allowing for the evaluation of four meridians within 5 seconds.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Optics
Boyu Tian, Die Qiu, Ting He, Zheqiang Zhong, Bin Zhang
Summary: This paper proposes a method for wavefront data compression using compressed sensing to enhance the correction ability of adaptive optics systems. By learning disturbed Zernike gradient dictionaries, an efficient compression and wavefront reconstruction method for aero-optical distortions is developed.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Optics
Vyas Akondi, Alfredo Dubra
Summary: This paper introduces an alternative definition of optical dynamic range based on avoiding the overlap of lenslet images. Compared to the traditional lenslet-bound definition, the optical dynamic range is larger and better adapted to the number of lenslets across the SHWS pupil. Additionally, a pre-centroiding algorithm is proposed to simplify the process of determining lenslet image locations in the presence of defocus and astigmatism.
Article
Materials Science, Multidisciplinary
Kangyao Sun, Yuancheng Fan, Shuang Chen, Fan Yang, Jiahui Li, Quanhong Fu, Fuli Zhang
Summary: A kind of simply structured metasurface, called the acoustic metagrating, has been developed for efficient beam wavefront manipulation. By combining traditional diffraction and interference theory with the free phase modulation ability of local resonant periodic structure, the metagrating achieves high efficient anomalous refraction. The structure shows promising applications in fields such as encryption or communications.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Kethmi H. Hettige, Chandima D. Tilakaratne
Summary: The article introduces an extension of the Mann-Whitney Scan Statistic that can be applied to spatiotemporal data without distributional assumptions. This new scan statistic has the potential to be powerful in various spatiotemporal domains.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Zhisheng Zhou, Jingang Zhang, Qiang Fu, Yunfeng Nie
Summary: The paper introduces an effective neural network based on low-frequency coefficients in the Fourier domain to estimate unknown aberrations with minimal simulation data. This method achieves the highest accuracy in wavefront retrieval compared to existing approaches and significantly reduces the training time.
Article
Geosciences, Multidisciplinary
Chao Shi, Yu Wang
Summary: This study proposed an ensemble RBFN method that can quantify prediction uncertainty in spatial interpolation and compared it with two other non-parametric data-driven approaches. The results showed that the proposed method provides better estimation of spatial patterns and associated prediction uncertainty when a reasonable amount of data is available as input. The prediction accuracy of all three methods improves as the number of measurements increases, with BCS showing less sensitivity to the number of measurement data and outperforming RBFN and MPS when only limited point observations are available.
GEOSCIENCE FRONTIERS
(2021)
Article
Multidisciplinary Sciences
Yequan Huang, Jingyun Guo, Yu Guo, Yan Cui, Zhechuang Li, Xuechuan Dong, Xiaolin Ning
Summary: This paper introduces a novel wide-angle refraction measurement method called Refraction Topography (RT), and evaluates its agreement with simulation results and expected refraction. RT utilizes a refraction algorithm on fundus images to measure refraction. Unlike traditional methods, RT requires the subject to stare at a stationary target. The study demonstrates the agreement between the test results obtained using RT, simulation results, and expected refraction on three test eyes.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Biswajit Pathak
Summary: In this paper, a programmable multiplexed grating-based wavefront sensor (MGWS) is proposed for zonal and modal wavefront sensing approaches. Different bit-planes of a color image are used to implement zonal wavefront sensing with enhanced spatial resolution and modal wavefront sensing to measure a large number of aberration modes. Simulation results show that the proposed MGWS can compensate for a significant number of aberration modes compared to using either sensing approach independently. The proposed sensor is flexible in switching between sensing approaches and the number of bit-planes can be increased to further improve performance.
Article
Health Care Sciences & Services
Kristine Gierz, Kayoung Park, Peihua Qiu
Summary: The paper proposes a novel non-parametric approach for estimating the point of treatment time-lag effect using an empirical divergence measure, and studies the theoretical properties of the estimator. The results from simulated data and real data examples support the effectiveness of the proposed method.
STATISTICAL METHODS IN MEDICAL RESEARCH
(2022)
Article
Optics
Loic Tabourin, Denis Brousseau, Simon Thibault, Tigran Galstian
Summary: This study investigates the capability of an electrically tunable liquid crystal lens (TLCL) to dynamically generate various wavefront shapes. The influence functions and crosstalk between them are characterized by adjusting voltage and frequency of electrical signals. The obtained results are important for designing adaptive optical systems that require dynamic wavefront control.
Article
Engineering, Electrical & Electronic
Mateusz P. Popek, D. Robert Iskander
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2020)
Article
Ophthalmology
D. Robert Iskander, Malgorzata A. Kostyszak, Danilo A. Jesus, Malgorzata Majewska, Monika E. Danielewska, Patrycja Krzyzanowska-Berkowska
OPTOMETRY AND VISION SCIENCE
(2020)
Article
Ophthalmology
Izabela Katarzyna Garaszczuk, Maryam Mousavi, Dorota H. Szczesna-Iskander, Alejandro Cervino, D. Robert Iskander
OPTOMETRY AND VISION SCIENCE
(2020)
Article
Multidisciplinary Sciences
Agnieszka Wylomanska, D. Robert Iskander, Krzysztof Burnecki
Article
Ophthalmology
Alejandra Consejo, Jedrzej Solarski, Karol Karnowski, Jos J. Rozema, Maciej Wojtkowski, D. Robert Iskander
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2020)
Article
Biochemistry & Molecular Biology
Agnieszka Olzynska, Alicja Wizert, Martin Stefl, D. Robert Iskander, Lukasz Cwiklik
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2020)
Article
Multidisciplinary Sciences
Patrycja Krzyzanowska-Berkowska, Karolina Czajor, D. Robert Iskander
Summary: The study found that impaired ocular blood flow associated with lamina cribrosa deformation in glaucoma patients, whereas glaucoma suspects had similar lamina cribrosa shape to glaucoma patients but the deformation was not associated with ocular blood flow biomarkers.
Article
Optics
Dominika Sulot, David Alonso-Caneiro, D. Robert Iskander, Michael J. Collins
Proceedings Paper
Computer Science, Hardware & Architecture
Radoslaw Rynca, D. Robert Iskander
INFORMATION SYSTEMS ARCHITECTURE AND TECHNOLOGY, ISAT 2019, PT III
(2020)
Meeting Abstract
Ophthalmology
D. Robert Iskander, Alejandra Consejo, Jedrzej Solarski, Karol Karnowski, Maciej Wojtkowski
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2020)
Meeting Abstract
Ophthalmology
Malgorzata Anna Kostyszak, Monika Ewa Danielewska, Marcela Niemczyk, Daniel Lewandowski, D. Robert Iskander
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2020)
Meeting Abstract
Ophthalmology
Monika Ewa Danielewska, Agnieszka Antonczyk, Maja M. Rogala, Danilo Andrade De Jesus, Anna Blonska, Marek Cwirko, Zdzislaw Kielbowicz, D. Robert Iskander
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2020)
Meeting Abstract
Ophthalmology
Marcela Niemczyk, Malgorzata Anna Kostyszak, Monika Ewa Danielewska, D. Robert Iskander
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2020)
Meeting Abstract
Ophthalmology
Dominika Sulot, David Alonso-Caneiro, Patrycja Krzyzanowska-Berkowska, D. Robert Iskander
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2020)
Article
Computer Science, Information Systems
Piotr D. Szyperski, D. Robert Iskander