Patrick Mineault made a little app to test if we all see the same colours.
He did the test, and in the end, yes, his wife has consistently different blue/green boundaries. It takes access to an adaptive optics ophthalmoscope to figure out if it’s a cone density difference or more of a Sapir-Whorf situation.
Over 200 people did the blue/green test on https://ismy.blue.
The median boundary between green and blue in this sample is around hue 172. The nominal boundary should be at 180, which corresponds to cyan (aka #00FFFF, or rgb(0, 255, 255)).
That means people, in this sample, are very “blue-inclusive”: cyan and turquoise are blue. By contrast, Patrick is blue exclusive (his boundary is 181, ~90% percentile), and cyan and turquoise feel green to him.
Of course, keep in mind these psychometric curves are a mix of local lighting, your screen’s calibration, and your idiosyncratic color boundaries. Relative boundaries between people should be fairly valid if you take the test on the same phone under the same lighting.
Here’s the source if you’re curious: https://github.com/patrickmineault/ismyblue
Surtil : 