Having observed directly the fibre channels in which the ions transport and their relaxation with a polarizing microscope, we have provided a strong evidence for the model of the channel conductance in the c-direction. At the same time, we observed that a rotation of π/2 in the polarization of transmission light only takes place near the channels for α-LiIO3. It is sure that the grating which produces light diffraction beam subtending large angles and turning its polarization to π/2 consists of the many channels.