Results 101 to 110 of about 3,228,378 (312)

Sensitivity and Specificity of Preschool Vision Screening in Iran

Iranian Journal of Public Health, 2017
Background: To determine the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the National Vision Screening Program for 7 yr old children in Iran.
Hassan HASHEMI, Abbasali YEKTA, Ebrahim JAFARZADEHPUR, Hadi OSTADIMOGHADDAM, Amir ASHARLOUS, Payam NABOVATI, Mehdi KHABAZKHOOB   +6 more
doaj  

Recomposable Layered Metasurfaces for Wavelength‐Multiplexed Optical Encryption via Modular Diffractive Deep Neural Networks

Advanced Functional Materials, EarlyView.
Modular diffractive deep neural network metasurfaces encode and reconstruct holograms across layer combinations and wavelengths, enabling secure, multifunctional operation. Each layer acts independently yet composes jointly, yielding up to m(2N −1) channels for m wavelengths and N layers.
Cherry Park, Youngsun Jeon, Seokho Lee, Yeseul Kim, Junsuk Rho   +4 more
wiley   +1 more source

Burden and Factors Associated with Refractive Errors Post Cataract Surgery at Kilimanjaro Christian Medical Center: A Hospital Based Retrospective Cross-sectional Study

, 2020
Livin Uwemeye, William Makupa
openalex   +2 more sources

Programmable In‐Situ Interactions Between Resins and Photopolymerized Structures for Seamlessly Integrated Optical Manufacturing of Microlenses

Advanced Functional Materials, EarlyView.
This study presents a dynamic interaction between liquid resins and photopolymerized structures enabled by an in situ light‐writing setup. By controlling a three‐phase interface through localized photopolymerization, which provides physical confinement for the remaining uncured resin regions, the approach establishes a programmable pathway that ...
Kibeom Kim, Sangmin Oh, Kahyun Hur, Hyesung Cho   +3 more
wiley   +1 more source

Effect of Age and Refractive Error on Local and Global Visual Perception in Chinese Children and Adolescents [PDF]

, 2022
Jiahe Gan, Ningli Wang, Shi‐Ming Li, Bo Wang, Meng‐Tian Kang, Shifei Wei, Jiyuan Guo, Luo‐Ru Liu, He Li   +8 more
openalex   +1 more source

External Reflection From Two‐Photon Laser‐Printed Micromirrors Enables Photomechanical Actuation at a 90° Incident Angle

Advanced Functional Materials, EarlyView.
Light reflectance increases along incidence angle and transmittance significantly drops around 90‐degree incidence angle. Here, we report two‐photon laser printed micro mirrors that redirect the skimming light beam into normal light absorption. Using this technique, light‐driven micro walkers and grippers are demonstrated by using grazing incidence ...
Leilei Song, Jianfeng Yang, Hao Zeng
wiley   +1 more source

REFRACTIVE ERRORS IN ADULTS STUDIED AT A TEACHING HOSPITAL

Gomal Journal of Medical Sciences, 2016
Background: Refractive errors are one of the commonest causes of visual impairment and disability. The aim of this study was to evaluate the distribution of different types of refractive errors.
Hidayatullah Mahsud, Muhammad Irfan Wazir, Muhammad Wali Saleem, Mirqad Ayaz   +3 more
doaj  

Corneal higher order aberrations by Sirius topography and their relation to different refractive errors [PDF]

, 2022
Abdelrahman Salman, Obeda Kailani, Marwan Ghabra, Rana Omran, Taym Darwish, Rafea Shaaban, Hussein Ibrahim, Hala Alhaji, Hussam Khalil   +8 more
openalex   +1 more source

Bio‐Inspired Magnetically Tunable Structural Colors from Elliptical Self‐Assembled Block Copolymer Microparticles

Advanced Functional Materials, EarlyView.
Cephalopod‐inspired photonic microparticles with dynamic structural coloration are fabricated via confined self‐assembly of linear block copolymers into ellipsoids containing stacked lamellae. Embedded superparamagnetic nanoparticles enable rapid magnetic alignment, restoring vivid, angle‐dependent color.
Gianluca Mazzotta, Simone Bertucci, Jose Mendoza‐Carreño, Agustín Mihi, Paola Lova, Davide Comoretto, Ullrich Steiner, Marco Lattuada, Andrea Dodero   +8 more
wiley   +1 more source

Two‐Way Shape Memory Alloy and Polymer Composite Hybrid Smart Actuator With High Speed, Accuracy, and Reversible Deformation

Advanced Functional Materials, EarlyView.
Tailored thermo‐mechanical properties of shape memory polymer composites enable large reversible deformation as well as high actuation speed. Moreover, a structural design with curvature in the transverse direction achieves sub‐second actuation on heating and a larger recovery ratio on cooling. Finally, these newly developed smart two‐way actuators can
Dajeong Kang, Seong Yeon Park, Yitro Samuel Aditya, Ha Eun Lee, Wonvin Kim, Sangyoon Bae, Seong Su Kim   +6 more
wiley   +1 more source