U.S. health regulators are warning consumers not to use more than two dozen varieties of over-the-counter eyedrops because of the risk of infections that could lead to blindness. The Food and Drug Administration advisory applies to lubricating drops sold by six companies, including CVS Health, Target, Rite Aid and Cardinal Health. Consumers should stop using the products immediately and avoid purchasing any that remain on pharmacy and store shelves, the FDA said in a statement Friday.