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officermike@lemmy.world ⁨2⁩ ⁨years⁩ ago

• Donut@leminal.space ⁨2⁩ ⁨years⁩ ago

  From the first source on the linked study, they describe it as the following:

  (…) This functions as a mirror providing the second opportunity for photon capture by reflecting light back through the retina, enhancing visual sensitivity.

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  • officermike@lemmy.world ⁨2⁩ ⁨years⁩ ago

    Neat!

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  • interdimensionalmeme@lemmy.ml ⁨2⁩ ⁨years⁩ ago

    But the iris is a mask, it blocks off axis light

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• fossilesque@mander.xyz ⁨2⁩ ⁨years⁩ ago

  royalsocietypublishing.org/doi/…/rspb.2022.1002

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• ceenote@lemmy.world ⁨2⁩ ⁨years⁩ ago

  Plus, no summer day is brighter than a clear winter day with snow on the ground.

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  • Catoblepas@lemmy.blahaj.zone ⁨2⁩ ⁨years⁩ 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.

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  • Suru@mander.xyz ⁨2⁩ ⁨years⁩ 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.

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  • TachyonTele@lemm.ee ⁨2⁩ ⁨years⁩ ago

    The pupil dilates, combined with more uv light seasonally, changes the structure of the iris and this it’s color.

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• turnipjs@lemmy.ml ⁨2⁩ ⁨years⁩ ago

  www.biorxiv.org/…/2024.01.17.576074v1.full.pdf

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• rhombus@sh.itjust.works ⁨2⁩ ⁨years⁩ 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.

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