Originally Posted by Chronoptimist
To me, this sounds like you are completely misunderstanding the fundamentals of calibration.
It is practically impossible to know what another person is seeing through their eyes, whether that is you, me, the guy doing color grading work in the mastering process, the film director etc.
It doesn’t matter
if we all see things differently. Everything is adjusted around a common reference point. Calibration is focused on bringing the display as close to that reference point as possible.
White balance is not something that is a personal preference. I certainly hope you have not been paid to go round and calibrate someone’s display, then set it to 7500K because they are used to 10,000K and think D65 looks too “yellow”. The point of a common reference is that you can look at it and objectively say “this is white”. It might take you a while to adjust to it if you have been used to looking at a display that was set to 10,000K, but setting it to anything else means you are not viewing content as intended.
The reality is that D65 is actually slightly blue (Illuminant E, which is closer to D55, is actually neutral white) and corresponds to roughly mid-day sun in western/northern Europe.
The problem here is that you suddenly have two eyes that are perceiving the world differently from each other. In time, you would hope that your brain will “recalibrate” to ignore a lot of that color difference, but the reality is that there will probably still be some kind of difference.
The only way to correct for that, is to put a yellow lens in front of your eye so that they are the same. I don’t suggest doing that now, because if you correct it externally, then your brain is not going to do anything to try and equalize the difference between them.
You can’t adjust a display so that it looks “correct” by eye if both eyes are perceiving things differently.
And the reality is that your “blue” eye is actually seeing color more accurately than before. This doesn’t require a change in the display.
I understand what you are saying though - that if you have cataracts in both eyes, so they are now yellowed, you could in theory calibrate the display to be more blue to cancel that out. But there is no way to measure the degree to which they have yellowed, to figure out what kind of correction they need.
And because cataracts are a gradual process, your brain has effectively been compensating for this yellow tint the whole time. Even if you could somehow measure that your eyes needed +850K or +1500K to see “true” D65 when you set the display like that, it will look too blue.
Why will it look too blue? Because D65 is a reference point that is based in reality, and everything you see through the cataract is too yellow, whether that's the display you are looking at, or if you step outside.
So mid-day sun through your eyes will look yellower than it should, along with everything else in the world. If you adjust the display any differently, it no longer matches up with reality, and stands out as looking blue.