Interesting that you chose cephalopods - their eyes work similarly in the "basic layout" to vertebrate eyes but cephalopod eyes have a few key differences, whic

Interesting that you chose cephalopods - their eyes work similarly in the "basic layout" to vertebrate eyes but cephalopod eyes have a few key differences, which may again be convergent evolution, since the most recent common ancestor didn't have eyes, only a photosensitive spot (which is still present in jellyfish).