Well-developed lens eye of <i>Strombus gigas</i>, on eyestalk has a black iris. There is a small tentacle on the eyestalk also.
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<a href="//commons.wikimedia.org/wiki/File:Eustrombus_gigas.jpg" class="mw-redirect" title="File:Eustrombus gigas.jpg">File:Eustrombus gigas.jpg</a>/ Nekton Rorqual 2009, ET eyes (Queen Conch)] by divemasterking2000 from Flickr. Cropped and levels adjusted by <a href="//commons.wikimedia.org/wiki/User:Snek01" title="User:Snek01">User:Snek01</a>.