W-shaped pupils likely also help cuttlefish see color and polarization of light, despite not having any cone cells in their retinas!

https://blogs.scientificamerican.com/octopus-chronicles/polarized-display-sheds-light-on-octopus-and-cuttlefish-vision-and-camouflage/

https://www.science.org/content/article/how-colorblind-cuttlefish-may-see-living-color