Results 251 to 260 of about 5,387,894 (300)

Simultaneous Broadening and Enhancement of Cr3+ Photoluminescence in LiIn2SbO6 by Chemical Unit Cosubstitution: Night-Vision and Near-Infrared Spectroscopy Detection Applications.

Angewandte Chemie, 2021
Near-infrared (NIR)-emitting phosphor materials have been extensively developed for optoelectronic and biomedical applications. Although Cr3+-activated phosphors have been widely reported, it is challenging to achieve ultra-broad and tunable NIR emission.
Dongjie Liu, Guogang Li, Peipei Dang, Qianqian Zhang, Yi Wei, Hongzhou Lian, Mengmeng Shang, Chun-Che Lin, Jun Lin   +8 more
semanticscholar   +1 more source

Flexible Optical Synapses Based on In2Se3/MoS2 Heterojunctions for Artificial Vision Systems in the Near-Infrared Range.

ACS Applied Materials and Interfaces, 2022
Near-infrared (NIR) synaptic devices integrate NIR optical sensitivity and synaptic plasticity, emulating the basic biomimetic function of the human visual system and showing great potential in NIR artificial vision systems.
Yunxia Hu, H. Yang, Jingtao Huang, Xin Zhang, Biying Tan, Huiming Shang, Shichao Zhang, W. Feng, Jingchuan Zhu, Jia Zhang, Y. Shuai, D. Jia, Yu Zhou, P. Hu   +13 more
semanticscholar   +1 more source

Presbyopia and Ocular Conditions Causing Near Vision Impairment in Older Adults From the Brazilian Amazon Region.

American journal of ophthalmology-glaucoma, 2018
PURPOSE To investigate the prevalence and causes of near vision impairment (NVI) in a population of older adults from the Brazilian Amazon Region. DESIGN Population-based cross-sectional study.
C. C. Cunha, A. Berezovsky, J. Furtado, N. N. Ferraz, A. Fernandes, S. Muñoz, Sung S Watanabe, P. Y. Sacai, Marcela Cypel, M. H. Mitsuhiro, P. H. Morales, G. Vasconcelos, M. J. Cohen, Mauro Q. Campos, J. Cohen, R. Belfort, S. Salomão   +16 more
semanticscholar   +1 more source

Near‐vision impairment and unresolved vision problems in Indigenous Australian adults

Clinical & Experimental Ophthalmology, 2012
AbstractBackground:  To describe near‐vision impairment, self‐reported unresolved vision problems and barriers to having near‐vision correction in Indigenous Australians.Design:  A nationwide population‐based study designed to determine the causes and prevalence of vision loss and utilization of eye care services.Participants:  Indigenous Australians ...
Arnold, Anna-Lena M. R., Goujon, Nicolas, Busija, Lucy, Fox, Sarah, Xie, Jing, Dunn, Ross A., Keeffe, Jill E., Taylor, Hugh R.   +7 more
openaire   +4 more sources

Information Processing in Near Peripheral Vision

The Journal of General Psychology, 1984
The present study required that Ss name briefly exposed single lower-case letters that were presented at a total of 24 locations (8 meridians X 3 retinal eccentricities, 0.5 degrees, 2.75 degrees, and 5.0 degrees from a central fixation point, 0 degrees).
openaire   +2 more sources

Adjustable Focus Telescopes for Near Vision

Optometry and Vision Science, 1991
It is important for clinicians to know the equivalent viewing power and corresponding equivalent viewing distance of the adjustable-focus telescopes they prescribe for low vision patients. Formulas are presented here to calculate the equivalent viewing power and distance of these telescopes.
openaire   +2 more sources

Fabric inspection by near-infrared machine vision

Optics Letters, 2004
Fabrics that have superstructures of colored squares, bands, etc., superimposed upon the basic web structure can be advantageously analyzed by use of near-infrared (NIR) illumination and a conventional monochrome camera. The reduction in contrast of the superstructure signal in the NIR image facilitates inspection of the fabric's structure and defect ...
Maria S, Millán, Jaume, Escofet
openaire   +2 more sources

Near vision contrast sensitivity after photorefractive keratectomy

Journal of Cataract and Refractive Surgery, 1997
To evaluate near vision contrast sensitivity as a measure of visual performance after photorefractive keratectomy (PRK).LSU Eye Center, New Orleans, Louisiana.Using Holladay Contrast Acuity Test cards, near (reading) vision for five levels of contrast sensitivity was evaluated in a cross section of 53 eyes of 31 patients 25 to 732 days after PRK ...
M J, Hodkin, M M, Lemos, M B, McDonald, J T, Holladay, S H, Shahidi   +4 more
openaire   +2 more sources

Near vision, lags of accommodation and myopia

Ophthalmic and Physiological Optics, 1999
SummaryIt is shown that, with some simplifying assumptions about the nature of the accommodation response/stimulus curve, geometrical optics predicts that lags in accommodation will result in ocular modulation transfer for any linear size of grating component in an object being independent of object distance.
openaire   +2 more sources

Heavy Mn2+ Doped MgAl2O4 Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Advanced Optical Materials, 2019
Photoluminescence originated from doped activators in the solid state materials usually faces the challenge of concentration quenching, restricting the further increase of photoluminescence intensity.
E. Song, Xingxing Jiang, Yayun Zhou, Zheshuai Lin, S. Ye, Z. Xia, Qinyuan Zhang   +6 more
semanticscholar   +1 more source