Results of VEP showed that: The latency of N75, P100, N145 in male and female normal children groups respectively were wave N75: 70, 92 ± 4, 47 ms and 69, 71 ± 4, 26 ms, wave P100: 102, 53 ± 6, 32 ms and 100, 74 ± 5, 96 ms, wave N145: 139, 12 ± 7, 01 ms and 138, 79 ± 6, 79 ms Amplitude of N75, P100, N145 were wave N75: 1, 95 ± 0, 36 µV and 1, 49 ± 0, 41 µV, wave P100: 7, 23 ± 1, 32 µV and 6, 67 ± 1, 54 µV, wave N145: 7, 49 ± 2, 53 µV and 6, 59 ± 2, 82 µV.