Results 11 to 20 of about 844,246 (360)
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
semanticscholar +1 more source
Negative Index Metamaterial Lens for Subwavelength Microwave Detection
Sensors, 2021 Metamaterials are engineered periodic structures designed to have unique properties not encountered in naturally occurring materials. One such unusual property of metamaterials is the ability to exhibit negative refractive index over a prescribed range ...
Srijan Datta +6 more
doaj +1 more source
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
semanticscholar +1 more source
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
semanticscholar +1 more source
CLEAR - Medical use of contact lenses.
Contact lens & anterior eye : the journal of the British Contact Lens Association, 2021 The medical use of contact lenses is a solution for many complex ocular conditions, including high refractive error, irregular astigmatism, primary and secondary corneal ectasia, disfiguring disease, and ocular surface disease.
D. Jacobs +11 more
semanticscholar +1 more source
Trifocal Intraocular Lens Implantation to Treat Visual Demands in Mongolian Patients
Central Asian Journal of Medical Sciences, 2022 Objective: Intraocular lens (IOL) implants are artificial lenses which helps to clear up the vision after cataract surgery. In this work, we aimed to compare the monofocal and trifocal IOL implantation during phacoemulsification.
Narangarav Gunchin-Ish +2 more
doaj +1 more source
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
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
semanticscholar +1 more source
British Journal of Ophthalmology, 2019 Aim To determine if ‘Defocus Incorporated Multiple Segments’ (DIMS) spectacle lenses slow childhood myopia progression. Methods A 2-year double-masked randomised controlled trial was carried out in 183 Chinese children aged 8–13 years, with myopia ...
C. Lam +8 more
semanticscholar +1 more source