(Reuters) - Third Point LLC, the U.S. hedge fund that has pushed for changes at companies ranging from Nestle SA to Campbell Soup Co , has amassed a stake in Ray-Ban maker EssilorLuxottica SA , people familiar with the matter said on Sunday. Third Point, run by billionaire investor Daniel Loeb, is targeting EssilorLuxottica amid a power struggle inside the world's largest lenses and glasses manufacturer, following its formation last year through a 48 billion euro ($53 billion) merger of France's Essilor and Italy's Luxottica.