Abbott Medical Optics Inc. earlier known as Advanced Medical Optics, Inc. (also known as AMO) is a global medical supply company. Products in the ophthalmic surgical line include intraocular lenses, laser vision correction systems, phacoemulsification systems, viscoelastics, microkeratomes and related products used in cataract and refractive surgery. AMO is based in Santa Ana, California, and employs approximately 4,200 worldwide. The company has operations in 24 countries and markets products in approximately 60 countries. AMO (originally Heyer-Schulte Medical Optics, renamed American Medical Optics after purchase by American Hospital Supply) started business in 1976 in the early development of intraocular lenses for cataract patients. AMO was spun off from Allergan in 2002.