EDIT: So I get the camera part but what about the eyes?
In: Other
There is no grain effect in eyes. There is a black and white effect though, where in extreme low light, objects lose colour because different cells are fired in the eyes.
Astronomers know this, when looking into an telescope eyepiece at a nebula one is advised to look at it with averted vision after having charged up the cells by not looking at any light sources (except dim red light)
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