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  • Kako testirati barvni vid pri otroku = Certification of colour vision in child
    Tekavčič Pompe, Manca ; Brecelj, Jelka ; Stirn-Kranjc, Branka
    Background. Studies have shown that chromatic information of visual stimulus is conducted and analysed in two major pathways, parvocellular (also named redgreen pathway) and koniocellular (also named ... blue yellow pathway). They both start in the retinal photoreceptors (cones) and finish in visual cortex. Colour vision can be tested in several different ways. Subjective psychophysical tests include Ishihara, Farnsworth-Munsell tests and anomaloscope, whereas objective tests include chromatic electroretinography (ERG), which can test cone function and chromatic visual evoked potentials (VEP), which can test parvocellular and koniocellular pathway function. Aim. To introduce a new method by choosing the optimal stimulus, which stimulates selectively parvocellular and koniocellular pathway. To show the stimulus and the signal in a child with normal colour vision and in a child with green deficiency (deuteranomalia). Methods and results. Isoluminant redgreen (blueyellow) stimulus was introduced. The stimulus was 7 deg large, round, composed of horizontal gratings. Spatial frequency was 2 c/deg, frequency of stimulation 1 Hz, onset: offset was 300: 700 ms. Two children are presented, agirl with normal colour vision and a boy with deuteranomalia. Characteristic N1 negative wave was significant in girl after red-green and blue yellow stimulation, whereas in boy with deuteranomalia N1 was absent after blue yellow and evident after redgreen stimulation. Conclusions. Chromatic VEP, as an objective colour vision testing method, could have an important role in testing children, therefore its study is important.
    Vir: Zdravniški vestnik : glasilo Slovenskega zdravniškega društva = Slovenian medical journal = journal of Slovenian Medical Association. - ISSN 1318-0347 (Letn. 73, št. 5, maj 2004, str. 451-454)
    Vrsta gradiva - članek, sestavni del
    Leto - 2004
    Jezik - slovenski
    COBISS.SI-ID - 17930713

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    Digitalna knjižnica Slovenije - dLib.si

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