Results 31 to 40 of about 833,654 (360)
The Long-Term Effect of Blue-Light Blocking Spectacle Lenses on Adults’ Contrast Perception
Frontiers in Neuroscience, 2022 PurposeTo evaluate the long-term effect of two different degrees of blue-light blocking (BB) spectacle lenses on adults’ contrast perception under various lighting conditions.MethodsIn total, 144 healthy adults aged 24.70 (±4.32 years) were recruited to ...
Yan Lian +5 more
doaj +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
Extended Depth-of-Field Intraocular Lenses: An Update
Asia - Pacific Journal of Ophthalmology, 2020 Extended depth-of-focus (EDOF) is a new intraocular lens (IOL) technology in the treatment of presbyopia. In contrast to multifocal (MF) IOLs, EDOF lenses create a single elongated focal point, rather than several foci, to enhance depth of focus. In this
P. Kanclerz +3 more
semanticscholar +1 more source
Weak-Lensing Ellipticities in a Strong-Lensing Regime [PDF]
The Astrophysical Journal, 2008 It is now routine to measure the weak gravitational lensing shear signal from the mean ellipticity of distant galaxies. However, conversion between ellipticity and shear assumes local linearity of the lensing potential (ie that the spatial derivatives of the shear are small), and this condition is not satisfied in some of the most interesting regions ...
Massey, R., Goldberg, D.M.
openaire +4 more sources
Türk Oftalmoloji Dergisi, 2013 Purpose: To evaluate the effects of different lens designs on visual quality among soft spherical contact lens users. Material and Method: Forty eyes of twenty patients from our contact lens unit were included in this study.
Mustafa Demir +2 more
doaj +1 more source
Liquid Crystal Devices for Beam Steering Applications
Micromachines, 2021 Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented.
Rowan Morris +2 more
doaj +1 more source
A 3-year Randomized Clinical Trial of MiSight Lenses for Myopia Control
Optometry and Vision Science, 2019 SIGNIFICANCE Results of this randomized, double-masked clinical trial demonstrate the effectiveness of the MiSight soft contact lens in slowing myopia progression over multiple years. PURPOSE The purpose of this study was to quantify the effectiveness of
P. Chamberlain +5 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
Wearable smart sensor systems integrated on soft contact lenses for wireless ocular diagnostics
Nature Communications, 2017 Wearable contact lenses which can monitor physiological parameters have attracted substantial interests due to the capability of direct detection of biomarkers contained in body fluids. However, previously reported contact lens sensors can only monitor a
Joohee Kim +12 more
semanticscholar +1 more source
Gravitational Lensing by Spherical Lenses
International Journal of Astronomy and Astrophysics, 2014 In this work we introduced a new proposal to study the gravitational lensing theory by spherical lenses, starting from its surface mass density $Σ(x)$ written in terms of a decreasing function $f$ of a dimensionless coordinate $x$ on the lens plane. The main result is the use of the function $f(x)$ to find directly the lens properties, at the same time
Hurtado, Roger +2 more
openaire +3 more sources