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Aren't you suggesting that we use the ear term for the eye term instead of the eye term for the ear term? ;)

Signal-to-noise is often used as a modality independent term.

Someone might reference signal-to-noise issues with modern news sources, body language, or a data set of any particular origin.

"Visual clutter" is an existing term that's been in use for a while now: https://books.google.com/ngrams/graph?content=%22visual+clut...

That seems intuitive. E.g. It is pretty common for people to turn down the radio in their car when they are looking carefully for an address.