Deep-sea “glass squids” have cells resembling fiber-optic cable located on the bottoms of their eyes. A new paper by Amanda Holt and Alison Sweeney shows that these cells are “pipes" for light that are deliberately leaky. The pipe-like cells function to camouflage the eye by reproducing both the color and angular distribution of light in the ocean where the squids leave. The eye can therefore dynamically reproduce the light that is missing from the spot that it occupies in the ocean, at many depths and in many water qualities, hiding it from predators looking from all possible directions.
The links to the paper and two writeups are below.
http://rsif.royalsocietypublishing.org/content/13/119/20160230
https://www.sciencenews.org/article/leaking-light-squid-hides-plain-sight?tgt=more
http://www.nature.com/nature/journal/v534/n7607/full/534298a.html