Results 1 to 10 of about 533 (174)

Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides [PDF]

Nanophotonics
Thin-film lithium tantalate (TFLT) has recently emerged as a promising photonic platform for chip-scale nonlinear optics due to its weaker photorefraction, higher optical damage threshold, broader transparency window, and lower birefringence compared to ...
Yu Simin, Qi Mingyue, Zhu Huizong, Zhao Bofu, Qian Jingchun, Wu Yiqun, Chen Qiushi, Lu Juanjuan   +7 more
doaj   +3 more sources

Agreement Between Non-Cycloplegic Photorefraction and Retinoscopy in Pediatric Refraction [PDF]

Life
Accurate assessment of refractive error in children is essential for clinical decision-making, yet agreement between non-cycloplegic techniques remains uncertain, particularly due to differences in accommodative demand. This study evaluated the agreement
Ana Roque, Amélia Fernandes Nunes, Henrique Nascimento, NIAOO Group, Clara Martinez-Perez   +4 more
doaj   +2 more sources

Deep learning-empowered low-cost portable automated refraction system: A solution to the inadequate effective correction rate of refractive errors in resource-limited areas. [PDF]

Ophthalmic Physiol Opt
Abstract Aims To develop and validate a low‐cost, portable automated refraction system (Tongren Digital Sight, TRDS) using deep learning and infrared eccentric photorefraction to improve refractive error correction in resource‐constrained settings. Methods This randomised controlled crossover trial enrolled 282 participants (18–60 years of age) at ...
Yan H, Yi Z, Qilin S, Hong C, Yan H, Wei T.   +5 more
europepmc   +2 more sources

Comparison of the PlusoptiX A16 and vision screener V100 [PDF]

Frontiers in Ophthalmology
Clinical relevanceThis study compares a novel photoscreening device with a previously validated one in a school-age population. It highlights a tendency of the new device to underestimate myopic spherical equivalent and overestimate hyperopic cases ...
Jorge Jorge, Paulo Fernandes
doaj   +2 more sources

Measurement Accuracy When Using Spot Vision Screener With or Without Cycloplegia in Young Adults [PDF]

Clinical Ophthalmology, 2023
Shunya Tatara,1,2 Fumiatsu Maeda,1,3 Hokuto Ubukata,1 Yuko Shiga,1 Kiyoshi Yaoeda3– 5 1Department of Orthoptics and Visual Sciences, Faculty of Medical Technology, Niigata University of Health and Welfare, Niigata, Japan; 2Department of Vision Science ...
Tatara S, Maeda F, Ubukata H, Shiga Y, Yaoeda K   +4 more
doaj   +2 more sources

Deep learning for predicting refractive error from multiple photorefraction images [PDF]

BioMedical Engineering OnLine, 2022
Background Refractive error detection is a significant factor in preventing the development of myopia. To improve the efficiency and accuracy of refractive error detection, a refractive error detection network (REDNet) is proposed that combines the ...
Daoliang Xu, Shangshang Ding, Tianli Zheng, Xingshuai Zhu, Zhiheng Gu, Bin Ye, Weiwei Fu   +6 more
doaj   +2 more sources

Electrically pumped soliton microcombs on thin-film lithium niobate. [PDF]

Nanophotonics
Abstract Thin‐film lithium niobate (TFLN) has enabled efficient on‐chip electro‐optic modulation and frequency conversion for information processing and precision measurement. Extending these capabilities with optical frequency combs unlocks massively parallel operations and coherent optical‐to‐microwave transduction, which are achievable in TFLN ...
Lv X, Wang Z, Xu T, Yang C, Jin X, Nie B, Qian D, Liu Y, Zhu K, Ni B, Gong Q, Bo F, Yang QF.   +12 more
europepmc   +2 more sources

Hacking continuous-variable quantum key distribution using the photorefractive effect on proton-exchanged/annealed-proton-exchanged waveguide [PDF]

Scientific Reports
Lithium niobate materials, which have the potential to fabricate lasers, modulation devices, and photodetectors, are widely used in quantum information processing due to their exceptional optical and electro-optical properties.
Ningyi Mao, Hang Zhang, Zhiyue Zuo, Yijun Wang, Yiyu Mao, Ying Guo   +5 more
doaj   +2 more sources

Photorefraction Simulates Well the Plasticity of Neural Synaptic Connections [PDF]

Biomimetics
In recent years, the need for systems capable of achieving the dynamic learning and information storage efficiency of the biological brain has led to the emergence of neuromorphic research.
Alessandro Bile, Hamed Tari, Riccardo Pepino, Arif Nabizada, Eugenio Fazio   +4 more
doaj   +2 more sources

Recommended practices for vision screening in pre-school-age children: A 2025 update. [PDF]

Optom Vis Sci
SIGNIFICANCE: Despite significant evidence supporting the utility of vision screening for identifying children who need further evaluation by an eye care professional, there is considerable variability in screening guidelines along with a lack of consensus for monitoring and reporting outcomes.
Pang Y, Lyons SA, Nottingham Chaplin PK, Block SS, Fishman D, Ciner EB, Advisory Committee to the National Center for Children’s Vision and Eye Health at Prevent Blindness.   +6 more
europepmc   +2 more sources