The visual evoked response to a 7 mm (40') check using a pattern reversal stimulus was measured in 73 normal children, aged 6-11. Full pattern displacement for the right and left eye and 1/4 and 1/2 pattern displacement for the right eye were studied. The amplitudes of the N65-P95 and P95-N125 wave, together with the P95 latency, were measured. Analysis of the data showed that there was no clear relationship between the mean amplitude or latency of the evoked response and age. However, significant changes were found between linear displacement and linear age for the N65-P95 wave and there was a complex interaction for the same wave between age, sex and eye. There was a significant difference in latencies between right and left eye between the boys and the girls, with the boys having longer latencies. There are thus both age- and sex-related differences in the amplitude and latency of the N65-P95 wave in 6-11 year-old children.