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officermike@lemmy.world 3 days ago
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.
fossilesque@mander.xyz 3 days ago
ceenote@lemmy.world 3 days ago
Plus, no summer day is brighter than a clear winter day with snow on the ground.
Catoblepas@lemmy.blahaj.zone 3 days ago
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.
Suru@mander.xyz 3 days ago
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.
TachyonTele@lemm.ee 3 days ago
The pupil dilates, combined with more uv light seasonally, changes the structure of the iris and this it’s color.
rhombus@sh.itjust.works 2 days ago
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.
Donut@leminal.space 3 days ago
From the first source on the linked study, they describe it as the following:
officermike@lemmy.world 3 days ago
Neat!
interdimensionalmeme@lemmy.ml 2 days ago
But the iris is a mask, it blocks off axis light