How would different kinds of eyes (polycoria, differently shaped pupils, etc.) work?

These questions are a sort of follow up of my question about white pupils. I'm designing some other creatures whose defining traits involve "weird" eyes:

• How would a creature with oddly shaped pupils see? Like I'm not just talking about slit-shaped or oval-shaped pupils--I'm talking about things like diamond-shaped, star-shaped, or even cross-shaped. Do the shape of the pupils affect how much the creature can see?
• What are the effects of polycoria in an organism? I've heard that in most cases of polycoria double vision can occur. If a creature were to have, say, three equally shaped pupils, would this produce the same effect? Would it even have a sort of "compound eye" effect if there were more pupils?
• Could a creature have multiple irises or a multicolored iris? This creature in question could have "layered" irises (so that it looks like they're rings circling the pupil) that it could use to rapidly alternate eye colors to intimidate threats, but I'm also pondering whether this could be achieved with a single, complex iris. Would either method work, and if so, would this affect the eyes' basic function in any way?

posted over 9 years ago

Hawkpelt‭

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