Single-Celled Organism Evolves Sophisticated Eye
http://www.iflscience.com/plants-and-animals/single-celled-organism-evolves-sophisticated-eye
http://www.ncbi.nlm.nih.gov/pubmed/19467154
Single-celled predator evolves tiny, human-like ‚eye‘: http://www.eurekalert.org/pub_releases/2015-07/uobc-spe063015.php
Eye-like ocelloids are built from different endosymbiotically acquired components: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature14593.html