EDIT: So I get the camera part but what about the eyes?
In: Other
In cameras it is a noise. When taking a photo in low light you have to open a shutter for longer time so that each cell of the sensor can “capture” enough light. Because the sensor is not perfect it generates some noise. So the longer shutter you have the more of both signal and noise you get.
Similarly in audio when you have weak signal and amplify it you amplify the noise as well.
I guess you “see noise” in your eyes as well. I. Not sure though.
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