With the use of MEDIAC a study was made of the effects of average evoked potential due to afferent stimulation of the sciatic nerve upon the wearing of the contact lens. The results obtained were as follows:
1) The average evoked potential of the cerebral cortex due to sciatic nerve stimulation was composed of N1, N2, Ng, P, N4 and N5 components. These components showed an inhibition in the form of a decrease in their amplitude following wearing of the contact lens.
2) Th e average evoked potential of the hippocampus due to sciatic nerve stimulation tended to be facilitated following wearing of the contact lens, that is, the HN1, HN2, HN3, HN4 and HN5 components generally had their amplitude increased.
