There's an analogy on the video side.
One time, I was working with some guys on a video and we'd be watching playback when one of the guys -- the golden eye -- would say, "take that back." We'd ask, "what's wrong?" He'd say there was something wrong in one of the frames we'd just watched. At first, there would be disbelief -- it looked fine to everyone else, including other guys with experience working in video. But, we'd rewind and sure enough, in freeze frame, we could see the artifact that was bothering him and it would be fixed.
After awhile, I learned to spot some of them myself, but not as many as he.
There is also a phenomenon in video called Edge Enhancement.
You might see the effect if you turn the sharpness up full on your flat screen or projector.
Sometimes, in the mastering of a video, they "bake" the extra sharpness into the transfer.
If you've seen this, it is a sort of optical illusion. What the sharpening does is insert thin white lines around dark colored objects and/or darker lines along the edges of light colored objects.
Some people call them halos.
If your eyes are "tricked" by the illusion, then you perceive the picture as looking really sharp.
But, the halos are really artifacts -- and if you notice them, they actually make the picture look awful.
Most people don't notice them and are tricked.
On HT sites, you'll see raging debates between people who see the halos and people who say the picture looks awesome.
Attempts are often made to settle the debate by posting still shots with arrows pointing to the halos -- because even in still shots the halos need to be pointed out to a number of people.
People are accused of seeing things that aren't there, etc.
I've read from a number of guys that they can't see the halos, don't want to learn how to spot them, and don't want to look at still shots to verify -- and these guys contribute to a thread where they rate the video quality of blu-rays. They don't want their perception altered, even if it would render them better able to do the job they are attempting.
I guess I can't blame them, though, but it's a perfect example of something......
This being human thing is a mess sometimes.