Wachtell, Lipton, Rosen & Katz and Allen & Overy advised Swiss drugmaker Novartis on its $28 billion acquisition of a majority stake in Alcon, the world’s largest eye-care company, according to the firms and sources familiar with the deal.

Cravath, Swaine & Moore advised Nestlé. The company owned all of Alcon from 1977 through 2002; it will have multiplied the value of its investment in the eye-care company by about 100 times with Monday’s sale of the 52 percent stake of the company it still owned, according to Bloomberg.