Primary building block of intermediate filaments is a dimer held together through the rod domains, which associate as a coiled coil.

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Duplicity Theory 

The existence of these two kinds of input, each working maximally under different conditions of illumination

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Axons of retinal ganglion cells  Received and transduced information and carried to the CNS

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Blind spot  There are no visual receptors over the optic disk

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The photosensitive pigment in the rods is called rhodopsin (visual purple).

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Rhodopsin is comprised of: 

Retinal (an aldehyde of vitamin A)

Opsin protein (GPCR)

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Retinal is parallel to the surface of the membrane and is attached to a lysine residue at position 296 in the seventh TM domain.