Results 31 to 40 of about 212,491 (313)
Refractive error among school children in Jhapa, Nepal
Journal of Optometry, 2011 Purpose: To evaluate the pattern of refractive errors among school children in Jhapa, Nepal. Methods: A cross-sectional study was designed to evaluate refractive status of 2236 school children in three government schools and a private school.
Gauri Shankar Shrestha +2 more
doaj +1 more source
Journal of Gandhara Medical and Dental Sciences, 2020 OBJECTIVES: Refractive errors and strabismus continue to remain a significant public health problem. Among school children it has an impact on child development.
Faheem Ullah +4 more
doaj +1 more source
Towards Automating Retinoscopy for Refractive Error Diagnosis [PDF]
arXiv, 2022 Refractive error is the most common eye disorder and is the key cause behind correctable visual impairment, responsible for nearly 80% of the visual impairment in the US. Refractive error can be diagnosed using multiple methods, including subjective refraction, retinoscopy, and autorefractors.
arxiv
Atmospheric Refractive Electromagnetic Wave Bending and Propagation Delay [PDF]
PASP 127, 947, p. 74-91, 2015, 2014 In this tutorial we summarize the physics and mathematics behind refractive electromagnetic wave bending and delay. Refractive bending and delay through the Earth's atmosphere at both radio/millimetric and optical/IR wavelengths are discussed, but with most emphasis on the former, and with Atacama Large Millimeter Array (ALMA) applications in mind.
arxiv +1 more source
The Cryogenic Refractive Indices of S-FTM16, a Unique Optical Glass for Near-Infrared Instruments [PDF]
Publ.Astron.Soc.Pac. 116 (2004) 833, 2004 The Ohara glass S-FTM16 is of considerable interest for near-infrared optical designs because it transmits well through the K band and because negative S-FTM16 elements can be used to accurately achromatize positive calcium fluoride elements in refractive collimators and cameras.
arxiv +1 more source
Cogent Medicine, 2021 To estimate the prevalence and distribution of uncorrected refractive error among school children in the Bongo District of Ghana. A descriptive cross-sectional study was conducted among 12–15-year-old children in eighteen public junior high schools in ...
Frederick A Asare, Priya Morjaria
doaj +1 more source
On the inapplicability of a negative-phase-velocity condition as a negative-refraction condition for active materials [PDF]
Microw. Opt. Technol. Lett., vol. 51, p. 1230 (2009), 2008 A negative-phase-velocity condition derived by Depine and Lakhtakia [Microwave Opt Technol Lett 41 (2004) 315] for isotropic, homogeneous, passive, dielectric-magnetic materials is inapplicable as a negative-refraction condition for active materials.
arxiv +1 more source
IEEE Access, 2022 Subjective accommodation refractive error models are essential for implementing adaptive vision correction devices that utilize varifocal optics. This article describes compact empirical models of subjective accommodative refractive errors in subjects ...
Mohit U. Karkhanis +7 more
doaj +1 more source
Inheritance of Refractive Error in Millennials [PDF]
Scientific Reports, 2020 AbstractOver the last decades, the prevalence of myopia has suddenly increased, and at this rate, half of the world’s population will be myopic by the year 2050. Contemporary behavioural and lifestyle circumstances, along with emergent technology, are thought to be responsible for this increase.
Dibyendu Pusti +4 more
openaire +2 more sources