By Kamal Choudhury and Christy Santhosh (Reuters) -The U.S. Food and Drug Administration has approved a new eye therapy from Glaukos Corp, giving patients a less painful option to treat a progressive condition that can severely affect vision, the company said on Monday. Shares of the company were up 2.6% in premarket trading. The approval makes the therapy, called Epioxa, the first FDA-cleared