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In the present study, we continue investigation of the high-contrast visionin the inverted retina of the vertebrates eyes. We report a method ofseparation and purification of porcine (Sus scrofa domestica) intermediatefilaments (IFs), extracted from the retinal M\"uller cells (MCs). We alsoreport experimental and theoretical methods of measurements and calculations ofthe reduced resistivity and light transmission by the IFs and single-wallcarbon 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 quiteclose to those of typical metals. We report a method for measuring the lightenergy transmission by the intermediate filaments and single-wall carbonnanotubes. We found that these structures efficiently transfer light energyalong its axis, with the light reemitted at the other end of the structure. Wealso report spectral selectivity of the IFs. The reported results demonstratethat the assumptions we made in deducing the theory of high-contrast vision inan inverted retina were correct and fully supported by the presently reportedexperimental results.

Optical transparency and electrical conductivity of single-wall carbon nanotubes and of intermediate filaments of porcine M\"uller cells