Results 81 to 90 of about 60,803 (278)

Assessing Effects of Riboflavin/UV‐A Cross‐Linking on Aqueous Outflow Facility, Corneal Biomechanics and Their Association With Intraocular Pressure

Journal of Biophotonics, EarlyView.
Our study demonstrates that UV cross‐linking (CXL) reduces outflow facility while increasing corneal elasticity across IOP levels of 20–40 mmHg, measured using direct manometry and non‐contact optical coherence elastography. These results highlight both parameters as potential indicators for evaluating CXL effectiveness and monitoring keratoconus ...
Yilong Zhang, Zhengshuyi Feng, Xingyu Jiang, Robert Scott, Ying Yang, Chunhui Li, Zhihong Huang   +6 more
wiley   +1 more source

Multivariate Regression Analysis to Predict Postoperative Refractive Astigmatism in Cataract Surgery

Journal of Ophthalmology, 2020
Purpose. To assess the correlation between postoperative refractive astigmatism and preoperative parameters in cataract surgery. Methods. Left eyes of 100 consecutive patients scheduled for cataract surgery with a 2.4 mm clear corneal incision were ...
Atsushi Kawahara, Tatsuhiko Sato, Ken Hayashi   +2 more
doaj   +1 more source

Preschool Children Exhibit Evident Compensatory Role of Internal Astigmatism in Distribution of Astigmatism: The Nanjing Eye Study.

Investigative Ophthalmology and Visual Science, 2019
Purpose To determine the prevalence and associated risk factors for total, corneal, and residual astigmatism and to evaluate the relations between components of astigmatism in Chinese preschool children. Methods In the population-based, cross-sectional
Zijin Wang, Dan Huang, Xuejuan Chen, Hui Zhu, Qigang Sun, Yue Wang, xiaohan zhang, Yue Wang, Leili Zhai, Chenyang Wang, Hu Liu   +10 more
semanticscholar   +1 more source

Impact of Beam Profile on Raman Spectroscopy Measurements

Journal of Raman Spectroscopy, EarlyView.
Characterisation and optimisation of the laser beam profile in Raman spectroscopy is critical to ensure accuracy and reproducibility of measurements. The laser beam size and profile have a significant effect on the axial resolution, energy distribution on the sample, focal spot size and excitation volume.
Dimitrios Tsikritsis, Nicolas Coca‐Lopez, Vassilis Μ. Papadakis, Keith R. Paton, Raquel Portela, George Kenanakis, Miguel A. Bañares, Natalie A. Belsey   +7 more
wiley   +1 more source

A comparative study of preoperative and postoperative changes in corneal astigmatism after pterygium excision by different techniques

Indian Journal of Ophthalmology, 2019
Purpose: To study the changes in corneal astigmatism before and after pterygium excision as well as with differences between various surgical techniques (bare sclera, conjunctival autograft, amniotic membrane graft).
Pragya Garg, A. Sahai, Mohd.Abid Shamshad, Lokendra Tyagi, Y. Singhal, Shalini Gupta   +5 more
semanticscholar   +1 more source

Nearly 180° Field‐of‐View Metalens for Miniaturized Imaging Systems

Laser &Photonics Reviews, EarlyView.
A compact, single‐layer metalens is developed with an ultra‐wide field of view of ≈180 degrees. Utilizing a unique quadratic phase profile, this metalens overcomes traditional issues like axial and color dispersion. It operates across red, green, and blue wavelengths with non‐polarized light, promising enhanced imaging capabilities for integration into
Azhar Javed Satti, Eunji Lee, Isma Javed, Kyungtae Kim, Joohoon Kim, Muhammad Ashar Naveed, Muhammad Zubair, Qammer H. Abbasi, Muhammad Qasim Mehmood, Junsuk Rho   +9 more
wiley   +1 more source

Orbital Angular Momentum Meta‐Holography with Full‐Polarization Control

Laser &Photonics Reviews, EarlyView.
This work demonstrates full‐polarization‐controlled orbital angular momentum (OAM) holography using a single‐layer dielectric metasurface. By independently modulating the complex‐amplitude distributions of two circular polarizations, arbitrary spatially varying polarization is achieved while preserving OAM properties.
Yue Han, Sheng Ye, Weiping Wan, Mingna Xun, Yuqing He, Qihuang Gong, Yan Li   +6 more
wiley   +1 more source

Asymmetrically Nonlinear Generation of Optical Orbital Angular Momentum via Cooperation of Bragg Diffraction and Birefringent Phase Matching

Laser &Photonics Reviews, EarlyView.
Nonlinear orbital angular momentum (OAM) manipulation is crucial for fundamental physics and information technologies. An integrated lithium niobate platform combining Bragg diffraction and birefringent phase matching asymmetrically generates and controls second‐harmonic OAM beams, achieving a normalized conversion efficiency of 10−2 W−1 and supports a
Xinyu Liu, Chun Chang, Yuntao Mo, Dingwei Liu, Dan Wei, Juntao Li, Dunzhao Wei, Xuehua Wang   +7 more
wiley   +1 more source

Genome-wide association studies for corneal and refractive astigmatism in UK Biobank demonstrate a shared role for myopia susceptibility loci

Human Genetics, 2018
Previous studies have suggested that naturally occurring genetic variation contributes to the risk of astigmatism. The purpose of this investigation was to identify genetic markers associated with corneal and refractive astigmatism in a large-scale ...
Rupal L. Shah, J. Guggenheim
semanticscholar   +1 more source

Experiments in Astigmatism Detection and Correction Techniques for the SEM [PDF]

, 2020
Richard Roebuck, B.C. Breton, D.M. Holburn, Nicholas Caldwell   +3 more
openalex   +1 more source