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We report that M\"uller cells contain bundles of long specializedintermediate filaments about 10 nm in diameter; most likely, these filamentsare the channels providing light transmission to photoreceptor cells inmammalian and avian retinas. We interpret transmission of light in suchchannels using the notions of quantum confinement, describing energy transportin structures with electro-conductive walls and diameter much smaller than thewavelength of the respective photons. Model calculations produce photontransmission efficiency in such channels exceeding 0.8, in optimized geometry.We infer that protein molecules make up the channels, proposing a qualitativemechanism of light transmission by such structures.

On the Mechanism of Light Transmission by M\"uller Cells