CERTIFICATION OF COLOUR VISION IN CHILD
Abstract
Background. Studies have shown that chromatic information of visual stimulus is conducted and analysed in two major pathways, parvocellular (also named red-green 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 red-green (blue-yellow) 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, a girl 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 red-green stimulation.
Conclusions. Chromatic VEP, as an objective colour vision testing method, could have an important role in testing children, therefore its study is important.
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