Luxottica and Essilor announced their intent to merge in January 2017, and regulatory agencies around the world have been investigating whether the merger poses anticompetitve concerns. Media outlets are speculating that the merger halts nascent competition between the two companies.
For more details, see here: https://www.bloomberg.com/gadfly/articles/2017-10-13/luxottica-s-53-billion-deal-looks-a-little-cracked