Of 12 patients with idiopathic senile full-thickness macular hole, 3 had bilateral involvement, 9 had monocular macular hole. Flash ERG and pattern VEP were performed in the bilateral eyes of all patients. The abnormal rate of the pattern VEP was 93.3% when we used 15' checkboard stimulus, the changes of the VEP appeared as delayed latencies, reduced amplitudes or malformation of P100. The abnormal rate of the flash ERG was 53.3%, showing primary characteristics of reduced amplitudes of cone response b-wave. There was statistically significant difference between the abnormal rates of the VEP and the ERG (P < 0.05). The halo diameters of the macular hole were significantly related to the latencies of P100 (P < 0.01), but there was no correlation between the hole diameter and the latencies of P100. In 9 fellow eyes which did not form macular hole, 3 eyes had the abnormal pattern VEP, including one eye having formed macular cyst. The results show that, in idiopathic senile macular hole, the pattern VEP provides more functional information than does the ERG, and prompts the importance of close follow-up of fellow eye.