  In the present study, we continue investigation of the high-contrast vision
in the inverted retina of the vertebrates eyes. We report a method of
separation and purification of porcine (Sus scrofa domestica) intermediate
filaments (IFs), extracted from the retinal M\"uller cells (MCs). We also
report experimental and theoretical methods of measurements and calculations of
the reduced resistivity and light transmission by the IFs and single-wall
carbon nanotubes (SWCNTs). The measured reduced resistivity values were
(3.1+-0.3)*10^-4 and (2.8+-0.2)*10^-4 Ohm m^-1 cm^2, respectively, being quite
close to those of typical metals. We report a method for measuring the light
energy transmission by the intermediate filaments and single-wall carbon
nanotubes. We found that these structures efficiently transfer light energy
along its axis, with the light reemitted at the other end of the structure. We
also report spectral selectivity of the IFs. The reported results demonstrate
that the assumptions we made in deducing the theory of high-contrast vision in
an inverted retina were correct and fully supported by the presently reported
experimental results.
