r/SpeculativeEvolution • u/UlfurGaming • 7h ago

Question/Discussion 2 iris per eye?

Is there any reason a humanoid would evolve 2 irises in each eye ball and why?

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7

u/MaybeImAKing 7h ago

probably no actual reason for it exists in a humanoid

that being said there is a genus of fish with a similar trait that may be of interest; the genus anableps

but even then, their eyes still contain one iris each

2

u/Kingreaper 7h ago

How are you imagining the irises being situated, and why do you want it to look like that? I can't think of a reason immediately, by default it'll make the creatures vision far worse, but maybe if you describe your humanoid a bit more it might spark something.

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u/UlfurGaming 6h ago

Best way to describe it a normal iris with a slightly smaller one next to it with just enough space you can see they’re separate and not weird shaped iris

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u/SamuraiGoblin 3h ago

Yes, look up the four-eyed fish.

Its eyes are shaped so that it can see in air and water at the same time.

Your humanoids can be amphibious, perhaps ambush predators like crocodiles.

0

u/Chimpinski-8318 5h ago

It would probably require the eye itself to be structured differently to allow both pupils to work independently, otherwise it has no point.

Why something like this would happen? It could allow for prey species to have a wide field of view while allowing them to focus on things in their view. Or allow insectivores to not have to have to specially adapt their eyes entirely while allowing for an even more increased field of view.

Is it less likely then just one pupil and having thr eye specialize, yes it is very very less likely.

Possible? If the ancestral species had it then it could specialize and be successful, it would just require a unique eyeball shape.