Browsing by Author "Mtanda, Ali Tawakali"

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    Retinal and cortical mechanisms op amblyopia: evaluation of colour vision, mesopic vision, visual evoked potentials, and lightness discrimination in adult amblyopes
    (University of Dar es Salaam, 1989) Mtanda, Ali Tawakali
    This is a study conducted on 30 adult males and females strabismic and anisometropic amblyopes using colour vision tests, the lightness discrimination test, mesopic vision tests, and visual evoked responses, in order to determine the probable site of amblyopia. The results showed that, in its progressed stages, amblyopia is associated with eccentric fixation, abnormal hue discrimination, disturbed spatial and temporal contrast mechanisms as manifested by disturbed lightness discrimination and mesopic vision, and attenuation of the amplitude of the pattern visual evoked response. On the basis of the current knowledge of the neuro¬anatomy and the neurophysiology of the visual system, it is suggested that these abnormalities result from a defect involving the extrastriate visual association areas 18 and 19 of Broadmann.