Search for dissertations about: "spherical lens"
Showing result 1 - 5 of 12 swedish dissertations containing the words spherical lens.
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1. MULTIFOCAL SPHERICAL FISH LENSES
Abstract : Vision is an important source of information for many animals. The lens plays a central role in the visual pathway and hence the ecology of these animals. Fish have spherically shaped crystalline lenses that contain a gradient of refractive index. Like all refracting elements, lens performance depends on the wavelength of the refracted light. READ MORE
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2. Manipulation of Ocular Aberrations in Myopes
Abstract : Myopia is a major cause of vision loss throughout the world. High myopia is associated with severe eye diseases like maculopathy, retinal detachment and glaucoma. The prevalence of myopia is increasing, and varies by country and by ethnic group. In some Asian populations the prevalence is 70%-80%. READ MORE
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3. Fish Lenses : Anatomy and Optics
Abstract : I have investigated some of the biological regulatory mechanisms governing the development of crystalline lenses. I used fish as model animals because they possess optically interesting lenses, while the geometrical simplicity of fish lenses allows for studies that are difficult or impossible with the lenses of other animals. READ MORE
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4. Ocular aberrations and visual quality in aspherical and multifocal contact lenses
Abstract : Good visual quality and precise accommodation are required to be able to focus objects at distance and near, and are essential in order to be able to perform most tasks in life. Most eyes are not ideal eyes, i.e., they have different refractive errors which distort the produced image. READ MORE
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5. Accommodation : clinical and theoretical investigations
Abstract : Background: Accommodative insufficiency (AI) is a relatively common visual anomaly in children and young adults with an estimated prevalence of about 5%. Patients with AI usually suffer from blur, headaches and asthenopia associated with near work. READ MORE