<p>SVG version of <a href="//commons.wikimedia.org/wiki/File:Evolution_eye.png" title="File:Evolution eye.png">Image:Evolution_eye.png</a> with captions. The example on the left is the image of an eye of a vertebrate. On the right, that of an octopus.
</p><p><b>1</b>: Retina<br><b>2</b>: Nerve fibers<br><b>3</b>: Optic nerve<br></p>
<b>4</b>: Blind spot<br>
<a href="//commons.wikimedia.org/wiki/User:Caerbannog" title="User:Caerbannog">Caerbannog</a>
CC BY-SA 3.0
Own Work, based on <a href="//commons.wikimedia.org/wiki/File:Evolution_eye.png" title="File:Evolution eye.png">Image:Evolution_eye.png</a> created by Jerry Crimson Mann 07:07, 2 August 2005 UTC (itself under GFDL).