At what level in resolution (4k, 8k, etc) is something higher resolution than average human eyes max out at and why?
In: Biology
It’s gonna vary based on the distance to the screen and how you define “max out”. Also, human vision isn’t very accurately represented by pixels per square inch (PPI), which is what we use for screens.
For example, someone with 20/20 vision sitting 1 foot from a screen could see roughly 477-573 PPI, but that just means they wouldn’t be able to see the white space between pixels at that distance. At 15 inches away, that number drops into the 350 PPI range.
Sitting 6 feet away means you could see around 240 PPI, but it’s disingenuous because that would mean a 24″ screen at 1080p would mathematically appear the same as a 60″ 4k HD screen, which we know to be incorrect from practice. This is because pixels vary across manufacturers and types of screens.
And then you have to worry about things like lower fidelity cameras, video or image compression, etc. A 720p video is going to appear worse the better your screen is, regardless of PPI or distance to the screen, for example.
So, to be technical about it, there really just isn’t a good or accurate way to describe human vision in PPI.
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