The aim is to study chromatic visual evoked potentials (VEP) to
isoluminant red-green (R-G) stimulus in schoolchildren. Sixty children
(7–19 years) with normal color vision were examined, 30 binocularly
and 30 monocularly. The isoluminant point was determined for each child
subjectively by using heterochromatic flicker photometry, and objectively
from recordings. The stimulus was a 7° circle composed of horizontal
sinusoidal gratings, with spatial frequency 2 cycles/degrees and 90%
contrast, presented in onset-offset mode. VEP were recorded from Oz
(mid-occipital) position. Age-dependent waveform changes and changes of
the positive and negative wave were studied to both binocular and
monocular R-G stimulation. Age-dependent waveform changes were observed to
binocular and monocular R-G stimulation. In younger children the positive
wave was prominent, whereas in older children also the negative wave
became more evident. The latency of the positive wave decreased linearly
with age to R-G binocular stimulation. To monocular stimulation no
significant changes of the latency were observed. The amplitude of the
positive wave dropped exponentially with age to binocular and monocular
stimulation. The latency of the negative wave increased linearly with age
to binocular and monocular stimulation, whereas the amplitude did not show
age-dependent changes. These findings suggest that the chromatic VEP
response undergoes evident age-dependent changes during the school-age
period.