Rod cell

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Schematic of classic retinal photoreceptors. It is now known that ipRGC ganglion cells which are found inferiorly (towards the light) also have a photoreceptor function

The classical retinal photoreceptor cell, responsible for peripheral, non colour (sensitive maximally at 495 nm), and low intensity vision in man(it is about three times as sensitive, as cone cells). Is rod shaped and contains in its outer segments folded membrane structures that contain the opsin pigment rhodopsin. In the cellular environment rhodopsin is about 800-fold more stable than the cone pigment, so gives a much higher signal-to-noise ratio.