Results 81 to 90 of about 3,616,800 (230)
Uncorrected refractive error [PDF]
British Journal of Ophthalmology, 2006 We need to act now to eliminate preventable blindness by the year 2020 In 1997, the World Health Organization set itself an ambitious goal to eliminate avoidable blindness in the world by 2020, with one of the five main priorities being refractive errors.1,2 A recent review of the impact of Vision 2020 on preventable blindness, other than uncorrected ...
openaire +1 more source
Scattering matrices and expansion coefficients of Martian analogue palagonite particles
, 2008 We present measurements of ratios of elements of the scattering matrix of Martian analogue palagonite particles for scattering angles ranging from 3 to 174 degrees and a wavelength of 632.8 nm.
Hovenier, J. W. +5 more
core +1 more source
Refractive Errors in 3–6 Year-Old Chinese Children: A Very Low Prevalence of Myopia?
PLoS ONE, 2013 Purpose To examine the prevalence of refractive errors in children aged 3–6 years in China. Methods Children were recruited for a trial of a home-based amblyopia screening kit in Guangzhou preschools, during which cycloplegic refractions were measured in
Weizhong Lan +6 more
semanticscholar +1 more source
New type of ellipsometry in infrared spectroscopy: The double-reference method
, 2008 We have developed a conceptually new type of ellipsometry which allows the determination of the complex refractive index by simultaneously measuring the unpolarized normal-incidence reflectivity relative to the vacuum and to another reference media. From
Azzam R. M. A. +5 more
core +1 more source
Corneal and Ocular Aberrations: A Comparative Study of Hyperopic, Emmetropic, and Myopic Eyes
Journal of Ophthalmic & Vision ResearchPurpose: To investigate differences in corneal and ocular aberrations between hyperopic, emmetropic, and myopic eyes. Methods: This cross-sectional study included 84 eyes from 84 healthy participants (age range 18-35 years), who were equally divided ...
Amir Golmakani +3 more
doaj +1 more source
Analysis of graded-index optical fibers by the spectral parameter power series method
, 2014 Spectral parameter power series (SPPS) method is a recently introduced technique for solving linear differential equations and related spectral problems.
Kravchenko, Vladislav V. +2 more
core +1 more source
Is there an association between convergence insufficiency and refractive errors?
African Vision and Eye Health, 2017 Background: Refractive errors and convergence insufficiency play major roles in reading efficiency. Uncorrected refractive errors are a primary cause of binocular anomalies, including convergence insufficiency.
Samuel Otabor Wajuihian
doaj +1 more source
A Transmittance-optimized, Point-focus Fresnel Lens Solar Concentrator [PDF]
, 1984 The development of a point-focus Fresnel lens solar concentrator for high-temperature solar thermal energy system applications is discussed. The concentrator utilizes a transmittance-optimized, short-focal-length, dome-shaped refractive Fresnel lens as ...
Oneill, M. J.
core +1 more source
Refractive Errors in State Junior High School Students in Bandung
Althea Medical Journal, 2016 Background: Uncorrected refractive error is one of the avoidable causes of vision impairment in children and adults. Vision problem in children has been shown to affect their psychological and academic performance.
Sabila Tasyakur Nikmah +2 more
doaj +1 more source
Correction of refractive errors
Zdravniški Vestnik, 2005 Background: Spectacles and contact lenses are the most frequently used, the safest and the cheapest way to correct refractive errors. The development of keratorefractive surgery has brought new opportunities for correction of refractive errors in ...
Vladimir Pfeifer, Ivana Gardaševič
doaj