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Why do cephalopods have w-shaped irises?

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they do not, by default. Some species, notably the cuttlefish, do exhibit that shape in the pupil(some types of octopus also possess a similar shape sometimes). It's known that they do perceive changes in polarization of the light, but it has more to do with the retinal structure than with the shape of the pupil. read more

I think this question should be w-shaped pupil. Octopus has a different shaped pupil. The pupil of a cuttlefish is a W shape. read more

When we see blurry, the light rays do not come to a focus at the back of the eye and interfere with each other. There are some light rays in the main center channel that are parallel and do not need to be focused in order to see clearly. read more

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