Researchers discover fish with a previously unknown type of eye - - TopicsExpress

Researchers discover fish with a previously unknown type of eye - March 2014 Excerpt: The University of Tübingens Institute of Anatomy has discovered a fish with a previously unknown type of eye. The aptly-named glasshead barreleye lives at depths of 800 to 1000 meters. It has a cylindrical eye pointing upwards to see prey, predators or potential mates silhouetted against the gloomy light above. But the eye also has a mirror-like second retina which can detect bioluminescent flashes created by deep-sea denizens to the sides and below,,,(How does it work?) “The light coming from below is focused onto a second retina by a curved mirror composed of many layers of small reflective plates made of guanine crystals, giving the fish a much bigger field of vision. phys.org/news/2014-03-fish-previously-unknown-eye.html

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