Results 1 to 10 of about 658,110 (323)

Vector Analysis Reveals That Topography-Guided LASIK Targeting the Manifest Refraction (MR) is Superior to Topography-Modified Refraction (TMR) and Layer Yolked Reduction of Astigmatism (LYRA) [Letter]

Clinical Ophthalmology, 2021
Avi Wallerstein,1,2,* Mathieu Gauvin1,2,* 1Department of Ophthalmology and Visual Sciences, McGill University, Montreal, QC, Canada; 2LASIK MD, Montreal, QC, Canada*These authors contributed equally to this workCorrespondence: Avi Wallerstein 1250 Rene ...
Wallerstein A, Gauvin M
doaj   +3 more sources

Reconstruction of three-dimensional retinal shape from refractive topography data. [PDF]

Sci Rep
Ma Z, Fang L, Ma C, Liu Y, Guo Z, Wang Y.   +5 more
europepmc   +3 more sources

Gate-tunable negative refraction of mid-infrared polaritons [PDF]

Science, 2022
Negative refraction provides a platform to manipulate mid-infrared and terahertz radiation for molecular sensing and thermal emission applications. However, its implementation based on metamaterials and plasmonic media presents challenges with optical ...
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Mengfei Xue, Ke Chen, Yuchuan Xiao, Yu Qu, Debo Hu, Jianing Chen, Zhipei Sun, Peining Li, F. D. de Abajo, Qing Dai   +13 more
semanticscholar   +1 more source

Negative refraction in hyperbolic hetero-bicrystals [PDF]

Science, 2022
We visualized negative refraction of phonon polaritons, which occurs at the interface between two natural crystals. The polaritons—hybrids of infrared photons and lattice vibrations—form collimated rays that display negative refraction when passing ...
A. Sternbach, S. Moore, A. Rikhter, S. Zhang, R. Jing, Y. Shao, B. Kim, S. Xu, S. Liu, J. Edgar, Á. Rubio, C. Dean, J. Hone, M. Fogler, D. Basov   +14 more
semanticscholar   +1 more source

Low Vision Management in A 5-Years-Old Due to Retinopathy of Prematurity for Life Quality Improvement

Folia Medica Indonesiana, 2021
Introduction: Management of low vision in pediatric patients with greater result  can affect their quality of life than in adult low vision patients.. Retinopathy of Prematurity is the main cause of blindness in children.
Christina Aritonang
doaj   +1 more source

Time-refraction optics with single cycle modulation

Nanophotonics, 2023
We present an experimental study of optical time-refraction caused by time-interfaces as short as a single optical cycle. Specifically, we study the propagation of a probe pulse through a sample undergoing a large refractive index change induced by an ...
Eran Lustig, Ohad Segal, S. Saha, E. Bordo, S. Chowdhury, Y. Sharabi, Avner Fleischer, A. Boltasseva, Oren Cohen, V. Shalaev, Mordechai Segev   +10 more
semanticscholar   +1 more source

Negative refraction makes a perfect lens [PDF]

Physical Review Letters, 2000
With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those ...
JB Pendry
semanticscholar   +1 more source

RBF-Based Camera Model Based on a Ray Constraint to Compensate for Refraction Error

Sensors, 2023
A camera equipped with a transparent shield can be modeled using the pinhole camera model and residual error vectors defined by the difference between the estimated ray from the pinhole camera model and the actual three-dimensional (3D) point.
Jaehyun Kim, Chanyoung Kim, Seongwook Yoon, Taehyeon Choi, Sanghoon Sull   +4 more
doaj   +1 more source

Planar refraction and lensing of highly confined polaritons in anisotropic media

Nature Communications, 2021
Refraction between isotropic media is characterized by light bending towards the normal to the boundary when passing from a low- to a high-refractive-index medium.
J. Duan, G. Álvarez‐Pérez, A. I. F. Tresguerres-Mata, J. Taboada-Gutiérrez, K. Voronin, A. Bylinkin, B. Chang, S. Xiao, S. Liu, J. Edgar, J. I. Martín, V. Volkov, R. Hillenbrand, J. Martín-Sánchez, A. Nikitin, P. Alonso‐González   +15 more
semanticscholar   +1 more source

Use of predictive models to identify patients who are likely to benefit from refraction at a follow-up visit after cataract surgery

Indian Journal of Ophthalmology, 2021
Purpose: To develop predictive models to identify cataract surgery patients who are more likely to benefit from refraction at a four-week postoperative exam. Methods: In this retrospective study, we used data of all 86,776 cataract surgeries performed in
Sachin Gupta, Matthew J Schneider, S Ashok Vardhan, Thulasiraj Ravilla   +3 more
doaj   +1 more source