Results 41 to 50 of about 257,877 (269)

Explaining negative refraction without negative refractive indices [PDF]

Journal of the Optical Society of America A, 2018
Negative refraction through a triangular prism may be explained without assigning a negative refractive index to the prism by using array theory. For the case of a beam incident upon the wedge, the array theory accurately predicts the beam transmission angle through the prism and provides an estimate of the frequency interval at which negative ...
Gregory A. Talalai, Timothy J. Garner, Steven J. Weiss   +2 more
openaire   +3 more sources

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

Non-traumatic bilateral corneal flap dislocation 20 years after LASIK

BMC Ophthalmology
Backgroud This report describes a case of late non-traumatic dislocation of bilateral corneal flaps, occurring 20 years after LASIK surgery. Case presentation A 52-year-old woman underwent LASIK surgery on both eyes 20 years ago.
Dakun Ren, Xiangrong Xie, Xingtong Wang, Xuming Guo   +3 more
doaj   +1 more source

Refraction in Media with a Negative Refractive Index [PDF]

Physical Review Letters, 2003
5 pages, 4 figures, submitted to Phys.
Foteinopoulou, S., Economou, E. N., Soukoulis, C. M.   +2 more
openaire   +3 more sources

A Depolarizing Leak in Sodium Bicarbonate Cotransporter NBCe1 Causes Brain Edema

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives SLC4A4 encodes electrogenic sodium bicarbonate cotransporter NBCe1, prominently expressed in kidney and brain. Recessive loss‐of‐function variants in SLC4A4 cause proximal renal tubular acidosis, no brain edema. In the brain, NBCe1 is expressed by astrocytes, where it regulates pH and mediates astrocyte volume changes.
Quinty Bisseling, Mark D. Parker, Sven Kerst, Richard A. Pasternack, Jacob Tondreau, Marjolein Breur, Gemma M. van Rooijen‐van Leeuwen, Davide Tonduti, Ettore Salsano, Alejandra Darling, Joanna A. E. van Wijk, Susanna Törnroth‐Horsefield, Marianna Bugiani, Petra J. W. Pouwels, Quinten Waisfisz, Marjo S. van der Knaap, Rogier Min   +16 more
wiley   +1 more source

Cooperative role of MDSCs and Tregs in alum-induced alloimmune tolerance in corneal transplantation

Scientific Reports
Alum, a widely used adjuvant, has recently been recognized for its capacity to modulate immune responses beyond classical activation. In this study, we investigated whether alum-induced expansion of myeloid-derived suppressor cells (MDSCs) and their ...
Lifang Li, Yuping Han, Xiangrong Xie, Dakun Ren, Ying Zhang, Shaofeng Hao, Xuming Guo   +6 more
doaj   +1 more source

The Role of Orthoptists in Refraction

British and Irish Orthoptic Journal
Purpose: In 2022, the General Optical Council initiated a call for evidence concerning the Opticians Act. This consultation aimed to gather input and evidence relevant to potential modifications to the Opticians Act.
Miriam L. Conway, Rakhee Shah, Elizabeth Chapman, Bruce J. W. Evans   +3 more
doaj   +1 more source

Risk of Retinopathy Associated with Long‐Term Use of Hydroxychloroquine in Patients with Rheumatic Diseases: A Systematic Review and Meta‐Analysis

Arthritis Care &Research, Accepted Article.
Objective We aimed to estimate the prevalence and cumulative incidence of hydroxychloroquine retinopathy (HCQ‐R) and its risk factors among long‐term HCQ users with rheumatic diseases through a systematic review and meta‐analysis of observational studies that used spectral‐domain OCT (SD‐OCT) for screening. Methods A systematic search of PubMed, Scopus,
Narsis Daftarian, Chloe Yue, Steve D Levasseur, Hui Xie, J. Antonio Avina‐Zubieta   +4 more
wiley   +1 more source

Corneal Astigmatism After Cataract Surgery: A Review of Mechanisms, Outcomes, and Surgical Considerations

Optics
Background: This narrative review aims to assess multiple strategies available to evaluate and manage corneal astigmatism in the context of cataract surgery, with a focus on the surgical techniques, intraocular lens (IOL) selection, and the integration ...
Andreea-Alexandra-Mihaela Muşat, Cãlin-Petru Tãtaru, Gabriela-Cornelia Muşat, Lucia Bubulac, Mihai-Alexandru Preda, Ovidiu Muşat   +5 more
doaj   +1 more source

Sensitivity of the corneal-plane refractive compensation to change in power and axial position of an intraocular lens

African Vision and Eye Health, 2009
If an intraocular lens is displaced or if its power is changed what are the consequences for the refractive compensation of the eye?  Gaussian optics is used to obtain explicit formulae for the sensitivityof the corneal-plane refractive compensation ...
W. F. Harris
doaj   +1 more source