Sökning: "Contact lenses"

Visar resultat 1 - 5 av 24 avhandlingar innehållade orden Contact lenses.

  1. 1. Congenital cataract and contact lenses

    Författare :Sara De Lima; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Purpose: Having a child with congenital cataract is associated with a huge responsibility for the parents in terms of the outcome of their child’s visual development. If the cataract is not removed the condition will lead to lifelong visual impairment and the surgery is preferably preformed within the first three months of life. LÄS MER

  3. 2. Ocular aberrations and visual quality in aspherical and multifocal contact lenses

    Författare :Anna Lindskoog Pettersson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Contact lenses;

    Sammanfattning : 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. LÄS MER

  4. 3. On millimeter and submillimeter wave focal plane arrays implemented with MEMS waveguide switches

    Författare :Henrik Frid; Joachim Oberhammer; Vessen Vassilev; Mikro- och nanosystemteknik KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Extended Hemispherical Lens; Beam Steering; Focal Plane Array FPA ; Ray-Tracing; RF MEMS; waveguide switch; micromachined waveguide; submillimeter-wave; rectangular waveguide; terahertz; lenses; antenna theory; silicon; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis presents research towards enabling micromachined millimeter and submillimeter wave focal plane arrays (FPAs). The FPAs operate under the following principle: a switch network consisting of microelectromechanical (MEMS) switches, integrated with micromachined waveguides, is used to feed an array of antenna elements, located in the focal plane of a high-gain quasi-optical system. LÄS MER

  5. 4. Manipulation of Ocular Aberrations in Myopes

    Författare :Baskar Theagarayan; Jörgen Gustafsson; Frank Schaeffel; Linnéuniversitetet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Myopia; Spherical aberration; Accommodation; Contact lens; Visual acuity; Peripheral aberrations; Optometry; Optometri; Optometry; Optometri;

    Sammanfattning : 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%. LÄS MER

  7. 5. Malpositioned and dislocated intraocular lenses : management, complications and surgical repositioning

    Författare :Laura Armonaite; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Cataract surgery (exchange of the non-transparent crystalline lens with an IOL) is the most frequent surgery in Sweden, accounting for more than 130000 surgeries per year. Therefore, complications associated with cataract surgery affect a significant number of patients. LÄS MER