Seeing is believing and big business for Essilor of America. The company makes and distributes optical lenses under the Airwear, Crizal, DEFINITY, and Varilux brands, to name a few. Its Essilor Laboratories of America business, a wholesale laboratory network, provides services and a variety of lens brands to opticians, optometrists and ophthalmologists across the US. Essilor of America is a subsidiary of multibillion-dollar Paris-based Essilor International, which operates 310-plus laboratories that make corrective lenses worldwide. In recent years, Essilor International has improved the America's product mix and presence through acquisitions of labs and independent optometrists, and optical chains.