Results 31 to 40 of about 641,949 (341)
Journal of Ophthalmology, 2016 The aim of the study was to determine the level of agreement between Javal’s rule, autorefraction, retinoscopy, and refractive astigmatism and to determine which technique is the most suitable substitute when subjective refraction is not applicable using
Kofi Asiedu +2 more
doaj +1 more source
Accuracy of noncycloplegic refraction performed at school screening camps
Indian Journal of Ophthalmology, 2018 Purpose: The aim of this study was to compare noncycloplegic refraction performed in school camp with that performed in eye clinic in children aged 6–16 years. Methods: A prospective study of children with unaided vision
Rolli Khurana +6 more
doaj +1 more source
Taiwan Journal of Ophthalmology, 2020 PURPOSE: There is a need to understand the requirement for the post-mydriatic test (PMT) among adults for the final prescription of spectacles as this test increases the cost of eye care and causes inconvenience to the patient because of the additional ...
Nagarajan Theruveethi +2 more
doaj +1 more source
Geoplanning: Journal of Geomatics and Planning, 2021 The first velocity correction is used to correct the measured distance affected by the velocity variation of the electromagnetic wave propagation in a medium.
Felipe Andrés Carvajal Rodriguez +2 more
doaj +1 more source
Anomalous refraction of airborne sound through ultrathin metasurfaces [PDF]
Scientific Reports, 2014 Similar to their optic counterparts, acoustic components are anticipated to flexibly tailor the propagation of sound. However, the practical applications, e.g.
K. Tang +5 more
semanticscholar +1 more source
Education Sciences, 2023 Spectroscopy is the basis of many applications in chemistry; however, the basic principles of light, light–matter interaction, and the operation of spectrophotometers are rarely present in chemistry curricula at the high-school level, or they are only ...
Maria Antonietta Carpentieri +3 more
doaj +1 more source
Tunable negative refraction without absorption via electromagnetically induced chirality [PDF]
, 2007 We show that negative refraction with minimal absorption can be obtained by means of quantum interference effects similar to electromagnetically induced transparency.
D. M. Cook +4 more
core +2 more sources
Study on the Polarization Pattern Induced by Wavy Water Surfaces
Remote Sensing, 2023 In nature, the wavy ocean surface is a common polarizer, which can change the polarization state of incident light by refraction and reflection and form a new polarization pattern different from the atmosphere.
Haoyuan Cheng +4 more
doaj +1 more source
ABCD matrix for reflection and refraction of laser beam at tilted concave and convex elliptic paraboloid interfaces and studying laser beam reflection from a tilted concave parabola of revolution [PDF]
Journal of Electrical and Computer Engineering Innovations, 2015 Studying Gaussian beam is a method to investigate laser beam propagation and ABCD matrix is a fast and simple method to simulate Gaussian beam propagation in different mediums.
M. Mansour Abadi +3 more
doaj +1 more source
Negative refraction in nonlinear wave systems [PDF]
, 2007 People have been familiar with the phenomenon of wave refraction for several centuries. Recently, a novel type of refraction, i.e., negative refraction, where both incident and refractory lines locate on the same side of the normal line, has been ...
Gang Hu +5 more
core +1 more source