What's the lowest level of graphics you still find acceptable?

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UnderstatedCornHole said:

I don't think people meant ALL low res games hurt their eyes. But anyone playing PSX/Saturn games that were using heavy 3D geometry will want to vomit, most of the time in sheer disgust.

I recently played Crash Bandicoot on PS1 and it didn't make me want to vomit in disgust.