One of the cool things I did when working in a portrait lab, running the color correction department, was to test my ability to correct color, on the same 10 images, both before and after cataract lens replacement surgery.
What I learned was startling and unexpected. Although nearly everything looked brighter, crisper, and "much nicer" after the surgery, the color balance I achieved was nearly identical, both before and after. The surgery really didn't change my ability to see and adjust digital image color RELATIVELY.
I still had the same minor deficiencies in the yellow-green part of the spectrum that I had previously. But the overall color balance — before and after — was within our lab standards, which were pretty stringent.
I had expected to see a big difference of some sort, based on my refreshed ability to see blues and greens with much more intensity. Instead, I got very similar results, with no particular bias shift.
Of course, everyone's experience may be different. Vision is NOT the same perception for all of us, but what matters is that we see the same *relative* differences in color and brightness, and adjust images accordingly, when working in critical applications.
Our collective experience in the color correction area (24 people total working up to 9 on each of three shifts) was that many things alter daily visual perception.
Caffeine, nicotine, cold and allergy medicines, alcohol hangovers, and many other mind altering drugs can make vision temporarily different.
Simple fatigue from lack of sleep and/or stress can reduce the accuracy of color adjustment, too.
Coming in from eating lunch on the patio in bright sun was a HUGE no-no. It took 20 to 30 minutes to dark adapt from that!
Pregnant women experienced vision shifts that tracked with their hormonal fluctuations. The department supervisor reporting to me was pregnant one year. She voluntarily avoided adjusting images for months! The rest of our staff covered her duties in the hot seat. (She brought it up with me, as I had no idea that was a factor before her experience.)
All of men on our staff absolutely did not see color as well as most of the women. Consequently, we had mostly women adjusting color! I remember hearing at a Kodak seminar that men can discriminate among approximately 3500 to 4000 hues, while women can see differences among 7000 to 8000 hues. No wonder there was this funny scene in *Mr. Blandings Builds His Dream House*:
https://youtu.be/s33ScN4D-HU To help keep our eyes neutral, the walls were painted middle gray (Munsell N8 paint, which isn't cheap!). The nine identical monitors had black hoods on them. Monitors were calibrated and custom-profiled weekly. Lighting was dim and indirect, low-wattage 5000K photo-grade fluorescents, bounced off a white ceiling for a very soft, diffused ambient environment. Windows desktops were set to middle gray colors. The Task Bars were set to auto-hide. The physical desk and table tops were also a middle gray color. Operators wore gray smocks. Combined, adding those measures made a HUGE difference in the stability and consistency of the work going to the servers and printers, by reducing visual fatigue.
One of the cool things I did when working in a por... (