- Mar 8, 2004
dwhatley;143148 said:She has an attitude for sure. Tonight she was partially in her den and I was looking at her and stroking the glass so she made me disappear by closing her iris. I need to go see what I can find on their eyes as it appears that their iris are like our eyelids and can be volentarily controled but I don't know if theirs only controls light or if it also is the equivalent of squinting to reshape the eye and see more detail in a smaller field.
I'm not certain in octos, but there's a paper I read about cuttles' w-shaped pupil that suggests its shape is for directional sharpening of images on the retina. Octos also have a horizontal band of sharper image-sensing cells on their retinas, so the ability to change the pupil shape as a rectangle may contribute to sharper focus on that band, maybe? Another interesting fact is that the light receptor cells in the octopus retina can adjust themselves for bright or dark conditions, so the pupil size is not the only way octos can acclimate to the light level, although pupil size is faster than the pigment adjustment in the photoreceptors.
I'm not sure if any of this helps with your question, but I've been reading a lot about ceph vision with the goal of making an article on it, so I figured I could pass on what I know...