Search for dissertations about: "visual acuity VA"

Showing result 1 - 5 of 19 swedish dissertations containing the words visual acuity VA.

  2. 1. Amblyopia and subnormal visual acuity. Studies of prevalence, assessment and outcome

    Author : Josefin Ohlsson; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Amblyopia; Visual Acuity; Eye Diseases; Epidemiology; Child; Adolescence; Depth Perception; Vision Screening; Treatment Outcome;

    Abstract : Aims. The aims of this thesis were threefold. Firstly, we wanted to establish the distribution of visual acuity (VA) and the prevalence of amblyopia and other ocular disorders in two population-based samples of 12-13-year-old children, one that had been vision-screened at preschool age and the other that had not. READ MORE

  4. 2. On vision in old age. A longitudinal study of subjects 70 to 97 years old

    Author : Birgitta Bergman; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; elderly; hearing impairment; intervention; longitudinal study; ocular disorders; old; risk factors; visual ability; visual acuity VA ;

    Abstract : Aims. The main purpose of this study was to investigate different aspects of vision and visual function in old people, like change in vision and visual ability, to study the natural course of eye diseases, assess needs of visual intervention, investigate risk factors for ocular disorders late in life, and also to investigate coexistence between visual and hearing impairments. READ MORE

  5. 3. On the necessity of screening and national registration of congenital cataracts

    Author : Gunilla Magnusson; Göteborgs universitet; []
    Keywords : congenital cataract; glaucoma; intraocular surgery; posterior capsular opacification PCO ; prevalence; visual acuity VA ; visual impairment; screening; newborn examination; blindness prevention; cost-utility analysis; quality- adjusted life year QALY ;

    Abstract : Objectives: The overall aim of this thesis was to contribute to improvements in the management of congenital cataract by defining the most efficient screening procedure, examining the magnitude of the morbidity rate, optimizing the timing of surgery by relating surgical outcome to age at intervention and severity of visual deprivation and furthermore by evaluating costs versus consequences of introducing the most efficient screening procedure found, on a national basis.Methods: Paper I: 72 children born between 1992 and 1998 in the Stockholm County Council region, Västra Götaland and Halland county, Linköping-Motala, Malmö, and Lund, who had surgery for congenital cataract before the age of one year were included in a retrospective study. READ MORE

  6. 4. On the identification of visual defects in children in general and prematurely born children in particular

    Author : Anna-Lena Hård; Göteborgs universitet; []
    Keywords : preschool vision screening; referral criteria; children; vision; preterm; cerebral visual impairment; visual perception; ocular fundus morphology;

    Abstract : Aims: Papers I & II: To evaluate the consequences of changes in the criteria for referral to an eye clinic following general pre-school vision screening. According to the former criteria all 4 year old children in the Göteborg area, with visual acuity (VA) ... READ MORE

  7. 5. The Rarebit fovea test : a new measure of visual function

    Author : Maria Nilsson; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Rarebit Fovea Test; Rarebit Perimetry; foveal function; fixation; diabetes; cataract; binocular summation;

    Abstract : Visual acuity (VA) measurement by the use of letter charts is the most frequently used method for testing foveal function. However, since a decimal visual acuity of 1. READ MORE