Article
Optics
Lei Yang, Boyang Nie, Lidong Wei, Li Xu, Juanjuan Jing, Jinsong Zhou, Xiaoying He, Lei Feng, Yacan Li
Summary: This paper proposes a new distortion correction method based on the off-axis Schwarzschild two-mirror hyperspectral imager, using polynomial and radial distortion models for correction. Compared with conventional methods, this approach is simple and efficient, suitable for correcting distortion in non-mapping pushbroom hyperspectral imagers.
Article
Optics
Jing Luo, Chenxu You, Xu He, Xiaohui Zhang
Summary: This paper analyzes the polarization properties of on-axis and off-axis TMA telescopes, designs and compares the polarization aberrations of the two, demonstrating that polarization aberrations are closely related to the structural features of mirrors and telescopes.
Article
Ophthalmology
David A. Atchison, Marwan Suheimat, Stanislovas Zacharovas, Charles E. Campbell
Summary: Through simulations, it was found that Grand-Seiko autorefractors with annular targets are likely to provide valid peripheral refractions. The results were closer to Zernike refractions and spherical aberration had up to 0.5D impact on refraction, while peripheral coma had limited influence.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
David A. Atchison
Summary: This study uses simulations to investigate the effect of lateral misalignment of the Grand-Seiko WR-5100K autorefractor on peripheral refraction. The results show that misalignment causes significant errors in peripheral refraction, with greater effects when misalignment and visual field are in opposite directions.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Optics
Xuemin Cheng, Hengzhi Ye, Qun Hao
Summary: The study proposes an automatic optical design scheme for off-axis stabilized zoom systems, optimizing non-defocusing imaging. A global merit function is established based on nodal aberration theory and nonlinear zoom equation, with solutions verified using Pareto Optimality theory.
Article
Optics
Xu He, Jing Luo, Jinxin Wang, Xiaohui Zhang, Yichen Liu
Summary: This research analyzes the alignment sensitivity of each component in the optical path of an off-axis TMA telescope and proposes an adaptive damping factor least-squares algorithm model to improve efficiency. Experimental verification shows that the method can reduce initial alignment accuracy requirements and improve adaptability to Zernike coefficient measurement noise, resulting in enhanced wave aberration values.
Article
Biochemical Research Methods
Juan Tabernero, Enian Kallamata, Gabriella Velonias, Fuensanta A. Vera-Diaz
Summary: Individualized optical modelling of the eye is a useful tool to estimate optical properties from geometrical parameters. This study extended the modeling to the peripheral retina, using corneal geometry and axial distances. The final model showed high agreement with measured optical quality for spherical equivalent and J0 astigmatism.
BIOMEDICAL OPTICS EXPRESS
(2023)
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
Optics
Jinxin Wang, Xu He, Jing Luo, Xiaohui Zhang, Tianxiao Xu
Summary: This paper discusses the issue of pupil-offset off-axis reflective astronomical telescopes with designed tilts and decenters, focusing on the strong coupling of axial and lateral misalignments due to the absence of symmetry. It introduces a method based on modified nodal aberration theory (NAT) to accurately calculate the aberration fields induced by misalignments, taking into account both axial and lateral misalignments. Simulation and actual alignment experiments were conducted to validate the proposed method, demonstrating its feasibility in achieving convergent solution results for different misalignment conditions.
Article
Engineering, Electrical & Electronic
Chenxing Li, Yiping Duan, Qiyuan Du, Shiqi Sun, Xin Deng, Xiaoming Tao
Summary: With the advancements in computer science and deep learning networks, artificial intelligence generation technology is becoming increasingly mature. This study focuses on the challenges of generating HD videos using deep learning models. The proposed model, StSg2vid, utilizes a spatio-temporal scene graph to represent the semantic information of each frame in the video. By leveraging graph convolutional neural networks, the model predicts the scene layout and generates frame images. Compared to state-of-the-art algorithms, the videos generated by our model achieve better results in both quantitative and qualitative evaluations. Additionally, this model has potential applications in the generation of virtual reality videos.
IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
(2023)
Article
Ophthalmology
Charles E. Campbell, Marwan Suheimat, Stanislovas Zacharovas, David A. Atchison
Summary: The study focused on the optical principles and properties of autorefractors that use the image-size principle. It was found that when light is diverging, hyperopia produces greater retinal image sizes than myopia; conversely, when light is converging, the opposite is true.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Engineering, Aerospace
Anna Ciurlo, Paolo Turri, Gunther Witzel, Jessica R. Lu, Tuan Do, Breann N. Sitarski, Michael P. Fitzgerald, Andrea M. Ghez, Carlos Alvarez, Sean K. Terry, Greg Doppmann, James E. Lyke, Sam Ragland, Randall Campbell, Keith Matthews
Summary: This study aims to model the PSF variations of the NIRC2 imager at the Keck Observatory. The instrumental phase aberrations over the entire field of view were characterized, and a metric called the fraction of variance unexplained (FVU) was used to quantify the quality of calibration. It was found that there is a daily variation of the wavefront error common to the whole detector, but the differential aberrations across the field of view are very stable. Modeling the PSF variations across the field of view improves the FVU metric and reduces the detection of fake sources.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2022)
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)
Editorial Material
Optics
Albert Liu
Summary: The article discusses the applications and unintuitive imaging characteristics of using off-axis parabolic mirrors to focus beams of light. These considerations have direct applications in implementing non-collinear optical geometries.
Article
Optics
Ming Wen, Hongcai Ma, Chengshan Han
Summary: This paper presents an optical alignment strategy for complex perturbed pupil-offset off-axis reflective telescopes based on nodal aberration theory. An analytical alignment model is established to quantitatively separate misalignments and surface figure errors from the total aberration fields. The alignment model is solved using a particle swarm optimization algorithm, demonstrating effective correction of the perturbed telescope.
Article
Ophthalmology
Mastour A. Alhamami, Ann E. Elsner, Victor E. Malinovsky, Christopher A. Clark, Bryan P. Haggerty, Glen Y. Ozawa, Jorge A. Cuadros, Karthikeyan Baskaran, Thomas J. Gast, Taras V. Litvin, Matthew S. Muller, Shane G. Brahm, Stuart B. Young, Masahiro Miura
OPTOMETRY AND VISION SCIENCE
(2017)
Article
Optics
M. Nadeem Akram, Rigmor C. Baraas, Karthikeyan Baskaran
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2018)
Article
Ophthalmology
Edmund Arthur, Stuart B. Young, Ann E. Elsner, Karthikeyan Baskaran, Joel A. Papay, Matthew S. Muller, Thomas J. Gast, Bryan P. Haggerty, Christopher A. Clark, Victor E. Malinovsky, Shane G. Brahm, Taras V. Litvin, Glen Y. Ozawa, Jorge A. Cuadros
OPTOMETRY AND VISION SCIENCE
(2019)
Article
Multidisciplinary Sciences
Karthikeyan Baskaran, Antonio Filipe Macedo, Yingchen He, Laura Hernandez-Moreno, Tatiana Queiros, J. Stephen Mansfield, Aurelie Calabrese
Article
Ophthalmology
Pelsin Demir, Karthikeyan Baskaran, Baskar Theagarayan, Peter Gierow, Padmaja Sankaridurg, Antonio Filipe Macedo
Summary: The prevalence of myopia is low among Swedish schoolchildren and genetic and environmental factors are associated with refractive error categories. Children with two myopic parents have higher myopia likelihood and increased axial length compared to those with one or no myopic parents.
CLINICAL AND EXPERIMENTAL OPTOMETRY
(2021)
Article
Ophthalmology
Pelsin Demir, Nathaniel Hovsepian, Peter Pagels, Vanja Petersson, Karthikeyan Baskaran, Antonio Filipe Macedo
Summary: Purpose markers are necessary to increase the diagnostic value of optical coherence tomography angiography by exploring the relationships between structural and microvascular measures. This study investigated these relationships in healthy children's eyes. Foveal thickness, fovea-to-macula thickness ratio (FMTR), and foveal microvasculature measurements were found to be correlated.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Pelsin Demir, Antonio Filipe Macedo, Ranjay Chakraborty, Karthikeyan Baskaran
Summary: The purpose of this study was to compare central and peripheral refraction in young children using the Shin-Nippon NVision-K 5001 autorefractor and the COAS-HD VR aberrometer. The results showed that the Shin-Nippon autorefractor measured more hyperopia than the COAS-HD VR for central refraction. The astigmatic components were similar between the two instruments for both central and peripheral refraction.
JOURNAL OF OPTOMETRY
(2023)
Article
Ophthalmology
Ranjay Chakraborty, Michael J. Collins, Henry Kricancic, Daniel Moderiano, Brett Davis, David Alonso-Caneiro, Fan Yi, Karthikeyan Baskaran
Summary: This study measured the post-illumination pupil response (PIPR) in young adults with different refractive errors using a custom-made optical system. The results showed that refractive error did not have an effect on PIPR, but there was a significant impact of different wavelengths of light stimulation on PIPR.
JOURNAL OF OPTOMETRY
(2022)
Article
Ophthalmology
Ranjay Chakraborty, Michael J. Collins, Henry Kricancic, Brett Davis, David Alonso-Caneiro, Fan Yi, Karthikeyan Baskaran
Summary: This study aimed to examine the effects of stimulation of intrinsically photosensitive retinal ganglion cells (ipRGCs) on axial length changes in young adults. The study found that stimulation of ipRGCs using blue light caused an increase in axial length. However, this effect was not observed in myopic defocus conditions.
JOURNAL OF OPTOMETRY
(2023)
Article
Ophthalmology
Karthikeyan Baskaran, Aurelie Calabrese, Laura Hernandez-Moreno, Diana Santos, Antonio Filipe Macedo
Summary: This study assesses the reading performance of normal sighted Portuguese schoolchildren using the Portuguese version of the MNREAD reading acuity chart and provides normative values. The findings show that reading speed increases with age and school grade, while reading acuity improves initially and then stabilizes in more mature children.
JOURNAL OF OPTOMETRY
(2023)
Article
Ophthalmology
Laura Hernandez-Moreno, Natacha Moreno Perdomo, Tomas S. Aleman, Karthikeyan Baskaran, Antonio Filipe Macedo
CASE REPORTS IN OPHTHALMOLOGICAL MEDICINE
(2018)
Meeting Abstract
Ophthalmology
Matthew S. Muller, Thomas Gast, Jeffrey Clendenon, Allen W. Ingling, Kenneth A. Stanfield, Jason J. Green, Karthikeyan Baskaran, Bryan Haggerty, Todd Peabody, Ann E. Elsner
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2015)
Meeting Abstract
Ophthalmology
Allen W. Ingling, Matthew S. Muller, Jason J. Green, Thomas Gast, Bryan Haggerty, Karthikeyan Baskaran, Jeffrey Clendenon, Kenneth A. Stanfield, Ann E. Elsner
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2015)
Proceedings Paper
Engineering, Electrical & Electronic
Matthew S. Muller, Jason J. Green, Karthikeyan Baskaran, Allen W. Ingling, Jeffrey L. Clendenon, Thomas J. Gast, Ann E. Elsner
EMERGING DIGITAL MICROMIRROR DEVICE BASED SYSTEMS AND APPLICATIONS VII
(2015)
Meeting Abstract
Ophthalmology
Karthikeyan Baskaran, Ann E. Elsner, Matthew S. Muller, Bryan P. Haggerty, Joel A. Papay, Thomas Gast, Taras V. Litvin, Glen Y. Ozawa, Jorge Cuadros, Benno L. Petrig
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2014)