Sökning: "High-pass Resolution Perimetry"

Hittade 5 avhandlingar innehållade orden High-pass Resolution Perimetry.

  1. 1. Neural limits of visual resolution

    Författare :Zoran Popovic; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cell separation; cortical magnification; detection; estimated receptive field; high-pass filtered optotypes; nyquist limit; psychophysics; resolution; ganglion cells;

    Sammanfattning : Aims: The aim of this thesis was to formulate a model of retinal neural circuitry in humans based on morphological estimates of retinal cone and ganglion cell populations, to compare results based on this model to psychophysical measurements of visual resolution and identify the retinal neural factors that limit visual resolution.Materials & Methods: Total displacement of central ganglion cells from foveal cones was obtained by estimating the length of fibers of Henle in four human retinas along the nasal or vertical hemi-meridians. LÄS MER

  2. 2. Kinoforms and peripheral vision

    Författare :Fredrik Nikolajeff; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-pass spatial frequency target; proximity effect; kinoforms; resolution; perimetry; successive development; direct-write electron-beam litography;

    Sammanfattning : .... LÄS MER

  3. 3. Diffractive Optical Elements: Fabrication, Replication, and Applications and Optical Properties of a Visual Field Test

    Författare :Fredrik Nikolajeff; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perimetry; beam homogenizing; antireflection; high-pass spatial frequency target; proximity effect; electron beam lithography; replication; successive development; diffractive optical element; axicon;

    Sammanfattning : This thesis mainly treats the fabrication, replication and applications of diffractive optical elements. A smaller part deals with optical properties of a visual field test. Diffractive optical elements are computer-generated micro-optic components that use diffraction to manipulate light. LÄS MER

  4. 4. Diagnosing and monitoring open-angle glaucoma. Pupillometry and other novel techniques

    Författare :Lada Kalaboukhova; Göteborgs universitet; []
    Nyckelord :open-angle glaucoma; relative afferent pupillary defect; pupillometer; visual field; Frequency Doubling Technology Perimetry; High-pass Resolution Perimetry; Heidelberg Retina Tomography;

    Sammanfattning : Aim:To investigate the ability of a custom-built pupillometer and other novel diagnostic instruments to detect and monitor optic nerve damage in glaucoma.Methods:In the first two studies we investigated pupillary reactions to light in patients with glaucoma and in healthy persons using a custom-built pupillometer. LÄS MER

  5. 5. Investigation of immunological preconditions in MS patients "MS immunopathic trait"

    Författare :Sara Haghighi; Göteborgs universitet; []
    Nyckelord :multiple sclerosis; siblings; CSF; oligoclonal; cytokine; sulfatide; genetics; trait;

    Sammanfattning : We examined 47 MS patients, 47 healthy siblings and 50 healthy unrelated individuals with blood and CSF analysis and found that 19 % (9/47) of healthy siblings of clinically definite multiple sclerosis patients had an intrathecal immunological reaction to ¡Ý 2 CSF-enriched OCB, in contrast to 4% (2/50) of the unrelated healthy controls. We termed this condition ¡°MS immunopathic trait¡±. LÄS MER