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  • Resultat 1031-1040 av 595666
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1031.
  • Abdi, Saber (författare)
  • Asthenopia in schoolchildren
  • 2007
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Asthenopia is a term used to describe different symptoms associated with the use of the eyes, such as pain, blurred vision, diplopia, headaches. Asthenopia is most often reported in association with near vision. Children with asthenopia complain of such symptoms particularly when reading and writing. Asthenopia is often divided into two main categories: refractive including refractive errors and anisometropia, and muscular, comprising strabismus and convergence insufficiency. Asthenopia due to accommodative problems has in the present studies been regarded as muscular asthenopia. In paper I the prevalence of asthenopia, refractive errors and binocular disorders was determined in a representative population of 216 Swedish schoolchildren aged 6 - 15 years. The prevalence of asthenopia was 23.1 %. The prevalence of hypermetropia and myopia changed with age, while astigmatism, convergence ability and strabismus did not. Accommodative insufficiency was more common in the older schoolchildren. Asthenopia was related to uncorrected visual acuity and refractive errors, and to accommodative insufficiency. Paper II described the orthoptic and ophthalmological findings in a group of 120 schoolchildren with asthenopia. The effect of asthenopia treatment was also evaluated. The most frequently occurring findings related to asthenopia were refractive errors, heterophoria and accommodative insufficiency. With appropriate treatment with glasses, prism or orthoptic exercises for 3 - 6 months, 112 out of the 120 children (93%) became asymptomatic. In paper III 49 schoolchildren with asthenopia due to accommodative insufficiency were assessed with the Visual Analogue Scale (VAS) and the grade of asthenopia was correlated with the degree of accommodative deficiency. The aim was to investigate if VAS grading of the asthenopic symptoms could be used as an instrument to indicate the level of improvement of accommodative insufficiency after treatment. A statistically significant reduction of asthenopic symptoms as graded with the VAS scale was observed, and the improvement in accommodation was also significant. However, there was no correlation between VAS values and the accommodation before and after treatment, and VAS values can only give a general impression of the level of accommodative ability in asthenopia (p < 0.001). Paper IV described how accommodative insufficiency influenced reading performance. Twelve children with asthenopia due to accommodative insufficiency were examined. Reading eye movements were recorded before and after treatment of asthenopia, using the IR corneal reflection technique, Orbit Eye trace System. Large variations in reading patterns were found. Despite successful accommodative treatment (p < 0.001), no correlation was found to the different eye movement parameters that could suggest that reading velocity was improved.
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1032.
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1033.
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1034.
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1035.
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1036.
  • Abdi, Y., et al. (författare)
  • Light-emitting nano-porous silicon structures fabricated using a plasma hydrogenation technique
  • 2005
  • Ingår i: Materials Science and Engineering B: Solid-State Materials for Advanced Technology. - : Elsevier BV. - 0921-5107. ; 124-125:SUPPL., s. 483-487
  • Tidskriftsartikel (refereegranskat)abstract
    • The preparation of porous silicon films by DC-plasma hydrogenation and subsequent annealing of amorphous silicon films on silicon and glass substrates is reported for the first time. The effects of varying plasma power and annealing temperatures have been investigated and characterized by scanning-electron microscopy, transmission-electron microscopy, and photoluminescence. A plasma density of about 5.5 W/m2 and hydrogenation-annealing temperatures of about 400 °C was found to be suitable for the formation of nano-crystalline silicon films with grain diameters of the order of 3-10 nm. The intensity and wavelength of the emitted visible light were found to depend on the hydrogenation and annealing conditions, and patterning of the silicon films using standard lithography allowed the creation of light-emitting patterns.
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1037.
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1038.
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1039.
  • Abdikalikova, Zamira (författare)
  • Compactness of embedding between Sobolev type spaces with multiweighted derivatives
  • 2009
  • Ingår i: AIHT : Analysis, Inequalities and Homogenization Theory.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • We consider a new Sobolev type function space called the space with multiweighted derivatives. As basis for this space serves some differential operators containing weight functions. We establish necessary and sufficient conditions for the boundedness and compactness of the embedding between the spaces with multiweighted derivatives in different selections of weights.
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1040.
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