this post was submitted on 25 Sep 2024
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This doesn't make sense to me. The iris doesn't collect light for vision. The pupil expands or contracts to vary the amount of light that reaches the retina. Iris color should have nothing to do with it.
From the first source on the linked study, they describe it as the following:
Neat!
But the iris is a mask, it blocks off axis light
https://royalsocietypublishing.org/doi/10.1098/rspb.2022.1002
Plus, no summer day is brighter than a clear winter day with snow on the ground.
It is if you live in a part of the world that is dark for months at a time during the winter, like reindeer do.
Most reindeer live North of the Arctic Circle, where the sun does not rise above the horizon in winter months. I suspect most summer days are brighter than the few hours of twilight the reideer get in December.
The pupil dilates, combined with more uv light seasonally, changes the structure of the iris and thus it's color. (It reflects differently)
https://www.biorxiv.org/content/10.1101/2024.01.17.576074v1.full.pdf
A lighter iris color correlates with higher light sensitivity and better low light vision. The higher density of pigment in a darker iris blocks light better.