Vertebrate vs cephalopod eye
Image details: vertebrate_cephalopod_eye.jpg
||Caerbannog; based on Image:Evolution_eye.png created by Jerry Crimson Mann 07:07; 2 August 2005 UTC (itself under GFDL)
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||Vertebrates and octopuses developed the camera eye independently. In the vertebrate version the nerve fibers pass in front of the retina, and there is a blind spot where the nerves pass through the retina. In the vertebrate example, 4 represents the blind spot, which is notably absent from the octopus eye. In vertebrates, 1 represents the retina and 2 is the nerve fibers, including the optic nerve (3), whereas in the octopus eye, 1 and 2 represent the nerve fibers and retina respectively.
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