Oleg Zabluda's blog
Tuesday, December 06, 2016
 
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Octopuses, squid and other cephalopods are colorblind – their eyes see only black and white – but their weirdly shaped pupils may allow them to detect color and mimic the colors of their background, [...] an unusual pupil – U-shaped, W-shaped or dumbbell-shaped – that allows light to enter the eye through the lens from many directions, rather than just straight into the retina. [...] accentuate the chromatic aberration, and might have the ability to judge color by bringing specific wavelengths to a focus on the retina, much the way animals like chameleons judge distance by using relative focus. They focus these wavelengths by changing the depth of their eyeball, altering the distance between the lens and the retina, and moving the pupil around to changes its off-axis location and thus the amount of chromatic blur.
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using chromatic aberration to detect color is more computationally intensive than other types of color vision, such as our own, and likely requires a lot of brainpower, Stubbs said. This may explain, in part, why cephalopods are the most intelligent invertebrates on Earth.
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http://news.berkeley.edu/2016/07/05/weird-pupils-let-octopuses-see-their-colorful-gardens/
http://news.berkeley.edu/2016/07/05/weird-pupils-let-octopuses-see-their-colorful-gardens

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