Results 31 to 40 of about 198,602 (291)

Compact Models of Presbyopia Accommodative Errors for Wearable Adaptive-Optics Vision Correction Devices

IEEE Access, 2022
Subjective accommodation refractive error models are essential for implementing adaptive vision correction devices that utilize varifocal optics. This article describes compact empirical models of subjective accommodative refractive errors in subjects ...
Mohit U. Karkhanis, Aishwaryadev Banerjee, Chayanjit Ghosh, Rugved Likhite, Erfan Pourshaban, Hanseup Kim, David A. Meyer, Carlos H. Mastrangelo   +7 more
doaj   +1 more source

Method for Assessing the Fidelity of Optical Diffraction Tomography Reconstruction Methods

, 2019
We use a spatial light modulator in a diffraction tomographic system to assess the accuracy of different refractive index reconstruction algorithms. Optical phase conjugation principles through complex media, allows us to quantify the error for different
Ayoub, Ahmed B., Lim, Joowon, Pham, Thanh-An, Psaltis, Demetri, Unser, Michael   +4 more
core   +1 more source

Calculating the error in refractive error [PDF]

Eye, 2011
To demonstrate a quick way of calculating the optical difference between two refractions using vector analysis, and to express this as a score for examination purposes.An existing formula is applied, converted to a defocus equivalent, and then converted to a score.
R H, Taylor, R B, Ellingham, S, Subramaniam, L A, Wakely   +3 more
openaire   +2 more sources

Peripheral refractive changes associated with myopia progression [PDF]

, 2013
Purpose.: To evaluate the changes in peripheral refraction profiles associated with myopia progression and treatment modalities used in the Cambridge Anti-Myopia Study.
Allen, Peter M., Calver, Richard I., O'Leary, Daniel J., Price, Holly C., Radhakrishnan, Hema, Rae, Sheila, Sailoganathan, Ananth, Theagarayan, Baskar P.   +7 more
core   +1 more source

Prevalence of Refractive Error and Strabismus in Primary School Children of Tehsil Lakki Marwat, Khyber Pakhtunkhwa Pakistan

Journal of Gandhara Medical and Dental Sciences, 2020
OBJECTIVES: Refractive errors and strabismus continue to remain a significant public health problem. Among school children it has an impact on child development.
Faheem Ullah, Naheed Mahsood, Waqas Mohyuddin, Saadullah Afridi, Zia ur Rehman   +4 more
doaj   +1 more source

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

Management of Residual Refractive Error after Cataract Phacoemulsification. Part 1. Keratorefractive Approaches

Oftalʹmologiâ, 2017
The review presents an analysis of the literature data on the methods of surgical correction of residual refractive error after cataract phacoemulsification. Keratorefractive and intraocular approaches are considered in details.
K. B. Pershin, N. F. Pashinova, A. Iu. Tsygankov, E. P. Gurmizov, L. V. Batalina   +4 more
doaj   +1 more source

Refractive errors among children, adolescents and adults attending eye clinics in Mexico [PDF]

International Journal of Ophthalmology, 2017
AIM: To assess the proportion of refractive errors in the Mexican population that visited primary care optometry clinics in fourteen states of Mexico. METHODS: Refractive data from 676 856 patients aged 6 to 90y were collected from optometry clinics in ...
Francisco Gomez-Salazar, Abraham Campos-Romero, Humberto Gomez-Campaña, Cinthia Cruz-Zamudio, Mariano Chaidez-Felix, Nidia Leon-Sicairos, Jorge Velazquez-Roman, Hector Flores-Villaseñor, Secundino Muro-Amador, Alma Marlene Guadron-Llanos, Javier J. Martinez-Garcia, Joel Murillo-Llanes, Jaime Sanchez-Cuen, Alejando Llausas-Vargas, Gerardo Alapizco-Castro, Ana Irineo-Cabrales, Enrique Graue-Hernandez   +16 more
doaj   +1 more source

Refractive error sensing from wavefront slopes [PDF]

, 1998
15 páginas, 8 figuras, 2 tablas.The problem of measuring the objective refractive error with an aberrometer has shown to be more elusive than expected.
Jaeschke, C., Niethard, Fritz Uwe, Weber, M., Wirtz, D.   +3 more
core   +1 more source

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