Speaking of cuttlefish, there was a cool paper in Science last year about how they actually exploit chromatic aberration in the pupil to see colors - it's been an open problem for years in biology how cuttlefish can obviously react to color, yet their retina only has one type of cell so their vision should be monochromatic.

http://www.sciencemag.org/news/2016/07/how-colorblind-cuttle...

HN discussion: https://news.ycombinator.com/item?id=13084534