The Federal Trade Commission has sued 1-800 Contacts, the largest online retailer of contact lenses in the United States, alleging that it unlawfully orchestrated and now maintains a web of anticompetitive agreements with rival online contact lens sellers that suppress competition in certain online search advertising auctions and that restrict truthful and non-misleading internet advertising to consumers, resulting in some consumers paying higher retail prices for contact lenses.
Details can be found at FTC website:

FTC Sues 1-800 Contacts, Charging that It Harms Competition in Online Search Advertising Auctions and Restricts Truthful Advertising to Consumers | Federal Trade Commission