نتایج جستجو برای: spectacle
تعداد نتایج: 2250 فیلتر نتایج به سال:
IMPORTANCE The number of urban migrants in China is 300 million and is increasing rapidly in response to government policies. Urban migrants have poor access to health care, but little is known about rates of correction of refractive error among migrant children. This is of particular significance in light of recent evidence demonstrating the educational impact of providing children with specta...
purpose: to determine the prevalence of refractive errors and rate of need for spectacles in students of region one in mashhad, 2006. methods: by randomized cluster sampling, 2510 students were selected and underwent eye exami-nations including refraction (cycloplegic, manifest), visual acuity, cover test and determination of the spectacle prescription as well as best corrected visual acuity. e...
Aeroelastic load simulations on a Siemens 2.3MW wind turbine have been validated using load measurements from the turbine and wind inflow measurements from a Nacelle based Lidar. A detailed survey of industrial usage of Nacelle mounted Lidars has also been conducted to extrapolate the findings from the present study to a broader framework.. Based on this information we assess the current techno...
PURPOSE Whether either natural emmetropization or compensation for imposed spectacle lenses requires the visual system to distinguish myopic from hyperopic blur is controversial. Some have argued that the visual system need only respond to the magnitude of the blur. This study was undertaken to test whether adding large amounts of astigmatic image blur would cause myopia and interfere with comp...
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