cephalopod eye

Although all vertebrates have this blind spot, cephalopod eyes, which are only superficially similar, do not.

Placing the wiring behind the light sensors is similar to the difference between a cephalopod eye and a vertebrate eye.

The way cephalopod eyes develop is fundamentally different from that of vertebrates like humans, but the way they work is rather similar.

The organogenesis and final structure of the cephalopod eye differs fundamentally from that of vertebrates such as humans.

It was originally argued that this difference shows that vertebrate and cephalopod eyes are not homology (biology) but have evolved separately.

They have fundamentally different layouts - the cephalopod eye is considerably better structured - and evolved separately and yes, they have the same function, but so what.

The morphological construction gives cephalopod eyes the same performance as sharks'; however, their construction differs as cephalopods lack a cornea, and have an everted retina.

Unlike the vertebrate eye, a cephalopod eye is focused through movement, much like the lens of a camera or telescope, rather than changing shape as the lens in the human eye does.

Because of their orthogonal organization, the visual pigment molecules in cephalopod eyes have the highest light absorption when aligned properly with the light e-vector axis, allowing sensitivity to differences in polarization.

Green lanternsharks feed mainly on squid and octopus, and are frequently found with cephalopod eyes and beaks in their stomachs so large that the sharks would have had to distend their jaws considerably to swallow them.

He says that natural selection has come up with an elaborate work-around of the eyes wobbling back-and-forth to correct for this, but vertebrates have not found the solution embodied in cephalopod eyes, where the optic nerve does not obstruct the view.

Phenotypic convergence of the geometry of cephalopod and most vertebrate eyes creates the impression that the vertebrate eye evolved from an imaging cephalopod eye, but this is not the case, as the reversed roles of their respective ciliary and rhabdomeric opsin classes and different lens crystallins show.