Results 21 to 30 of about 833,654 (360)
IET Microwaves, Antennas & Propagation, 2023 This study proposes an analytical formulation in complex coordinates to synthesise three‐dimensional single‐shell dielectric lens surfaces. An exact formulation based on geometrical optics is developed, and the synthesis problem is modelled as a non ...
Aline Rocha deAssis +2 more
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AUTOMATION OF LENSES CENTERING AT GLUING IN THE FRAME [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2015 This paper discusses the causes of lenses decentration at their gluing in the frame. We give the dependences of displacement value of the centers of curvature for the lens working surfaces from the base frame axis on the primary technological errors of ...
B. D. Bao, S. M. Latyev, R. Theska
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Applications of Hyaluronic Acid in Ophthalmology and Contact Lenses
Molecules, 2021 Hyaluronic acid (HA) is a glycosaminoglycan that was first isolated and identified from the vitreous body of a bull’s eye. HA is ubiquitous in the soft connective tissues of animals and therefore has high tissue compatibility for use in medication ...
Wan-Hsin Chang +7 more
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Contact lens & anterior eye : the journal of the British Contact Lens Association, 2021 Scleral lenses were the first type of contact lens, developed in the late nineteenth century to restore vision and protect the ocular surface. With the advent of rigid corneal lenses in the middle of the twentieth century and soft lenses in the 1970's ...
M. Barnett +10 more
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The Astronomy and Astrophysics Review, 2011 Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. As predicted by General Relativity, given their masses, clusters strongly deform space-time in their vicinity. Clusters act as some of the most powerful gravitational lenses in the Universe.
Kneib, Jean-Paul, Natarajan, Priyamvada
openaire +3 more sources
Aberration-free ultrathin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces. [PDF]
Nano letters (Print), 2012 The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped
F. Aieta +6 more
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Gold Nanocomposite Contact Lenses for Color Blindness Management
ACS Nano, 2021 Color vision deficiency (CVD) is an ocular congenital disorder that affects 8% of males and 0.5% of females. The most prevalent form of color vision deficiency (color blindness) affects protans and deutans and is more commonly known as “red–green color ...
Ahmed E. Salih +4 more
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Electrically Tunable Lenses: A Review
Frontiers in Robotics and AI, 2021 Optical lenses with electrically controllable focal length are of growing interest, in order to reduce the complexity, size, weight, response time and power consumption of conventional focusing/zooming systems, based on glass lenses displaced by motors ...
Leihao Chen +3 more
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Gradient Index Metasurface Lens for Microwave Imaging
Sensors, 2022 This paper presents the design, simulation and experimental validation of a gradient-index (GRIN) metasurface lens operating at 8 GHz for microwave imaging applications. The unit cell of the metasurface consists of an electric-LC (ELC) resonator.
Srijan Datta +2 more
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The advantages of metalenses over diffractive lenses
Nature Communications, 2020 Optical elements play a crucial role in many modern systems, from cellphones to missiles. The miniaturization trend poses a challenge to optics, since classical lenses and mirrors tend to be bulky.
J. Engelberg, U. Levy
semanticscholar +1 more source