Sökning: "astigmatism"

Visar resultat 1 - 5 av 25 avhandlingar innehållade ordet astigmatism.

1. 1. Corneal transplant outcome- a Swedish register

   Författare :Margareta Claesson; Göteborgs universitet; []
   Nyckelord :Corneal transplantation; Quality register; Long term follow up; Astigmatism; Bullous keratopathy; Graft survival; Visual outcome;

   Sammanfattning : Aim. The aim of this study was to present different aspects of the outcome after corneal transplantation based on data from the Swedish Cornea Register. Papers. The first paper describes the register and gives descriptive statistics and analysis of data from a two-year follow up, while the last paper presents data from a ten-year follow up. LÄS MER

3. 2. Optics for Low Vision Enabling

   Författare :Jörgen Gustafsson; Certec - Rehabiliteringsteknik och Design; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Eccentric viewing; Low vision optics; Low vision rehabilitation; People with low vision; Preferred retinal; locus PRL ; Resolution; Visual acuity; Ophtalmology; Medicinsk teknik; Medical technology; Rehabilitering medicinsk och social ; rehabilitation; revalidation; kinesitherapy; Oftalmologi; Physical medicine; Contrast sensitivity; Detection; Eccentric correction; CFL ; Central visual field loss; Central scotoma; Aberrations; Astigmatism;

   Sammanfattning : For people with central visual field loss, eccentric vision is all that they have to rely on. Even for those who learn how to correctly utilize their eccentric vision, it will never be as good as the central for two entirely different reasons: the off-axis optics of the eye can result in large refractive errors, and the low function of the peripheral retina. LÄS MER

4. 3. Laminar and turbulent particle laden flows : a numerical and experimental study

   Författare :Seyed Hamid Tabaeikazerooni; Luca Brandt; Jeanette Hussong; Raffaella Ocone; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Suspension flow; inertial effect; turbulent duct flow; finite-size particles; Immersed Boundary Method IBM ; Astigmatism Particle Tracking Velocimetry APTV ; Engineering Mechanics; Teknisk mekanik;

   Sammanfattning : Particle laden flows are widespread in nature and in industrial applications. Dust storms, geophysical flows, pharmaceutical processes, fluidized beds and blood flow are only a few examples. Both global and local properties of a particle laden flow may alter significantly in comparison to the corresponding single phase flow. LÄS MER

5. 4. Myopia control and peripheral vision

   Författare :Petros Papadogiannis; Linda Lundström; Peter Unsbo; Nicola Logan; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; myopia; peripheral vision; psychophysics;

   Sammanfattning : The rapid rise in myopia prevalence has caused an urgent need for effectivemyopia control interventions. This thesis investigates the role of theperipheral optics of the human eye in myopia progression. It was initiallybelieved that the axial elongation of the myopic eye is caused only by thedefocus signals presented to the central retina. LÄS MER

7. 5. Optimal Use of Peripheral Vision

   Författare :Karthikeyan Baskaran; Jörgen Gustafsson; Peter Unsbo; Staffan Carius; Michael Crossland; Linnéuniversitetet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; off-axis refractive errors; peripheral aberrations; aberrometers; central visual field loss; preferred retinal locus; eccentric viewing; absolute central scotoma; adaptive optics; eccentric correction.; Optometry; Optometri;

   Sammanfattning : People who lose their central vision have to rely on their peripheral vision for all visual tasks. The ability to resolve fine details in the periphery is reduced due to retinal limitations and the optical aberrations arising from the use of off-axis vision. LÄS MER