Author/Editor		Tekavčič-Pompe, Manca
Title		Barvni vidni evocirani potenciali pri zdravih otrocih in pri otrocih z okvarami barvnega vida
Type		monografija
Place		Ljubljana
Publisher		Univeza v Ljubljani, Medicinska fakulteta
Publication year		2006
Volume		str. 84
Language		slo
Abstract		Background: Visual evoked potentials (VEP) play an important role in the evaluation of visual pathway function in children. Selective parvocellular pathway evaluation can be carried out with chromatic VEP, still an experimental method. Routine colour vision evaluation is based on psychophysical methods (Ishihara, Farnsworth-Munsell, anomaloscope), which in paediatric population are sometimes less objective. The aim of this study was to evaluate chromatic VEP responses after changing stimulus characteristics, to investigate age-dependent changes of chromatic VEP in children with normal colour vision and to study chromatic VEP responses in children with congenital and acquired colour vision deficit. Subjects and Methods: 63 schoolchildren (6-19 years of age) with normal colour vision, 8 children with congenital colour vision deficit and 9 children after recovered optic neuritis (ON) were included in the study. All children were ophthalmologically examined, colour vision was assessed with Ishihara plates and Farnsworth-Munsell hue 100 test (FM 100), and in children with colour vision deficiency saturated and desaturated Farnsworth-Munsell 15 and Nagel anomaloscope were also utilised. VEP to isoluminant red-green (R-G) and blue-yellow (B-Y) stimulus were performed in all children. Half of the children with normal colour vision were tested monocularly (as were also children with recovered ON), whereas the other half were tested binocularly (as were also children with congenital colour vision deficiency). In the first part of the study stimulus characteristics (stimulus size, spatial frequency, contrast, mean luminance) were varied. Optimal stimulus was then chosen to investigate age-dependent changes of chromatic VEP in schoolchildren. An important aspect of the study was individual isoluminant point determination: subjectively with heterochromatic flicker photometry (HFP) and, objectively, from recordings. (Abstract truncated at 2000 characters)
Descriptors		COLOR PERCEPTION OPTIC NEURITIS COLOR VISION DEFECTS OPHTHALMOSCOPY EVOKED POTENTIALS, VISUAL COLOR PERCEPTION TESTS