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What is Alcon and explain in detail?
Alcon is an American Swiss medical company specializing in eye care products with headquarters in Geneva, Switzerland, and incorporated in Fribourg, Switzerland. Alcon began as a US company and its US subsidiary’s  headquarters remain in Fort Worth, Texas, where the Alcon division of the company was founded. 
Alcon was a subsidiary of Novartis until April 9, 2019, when the company completed a shareholder approved 100% spinoff of Alcon eye care devices business from Novartis.

History
The US division of Alcon was founded as an independent company in 1945 in Fort Worth, Texas, USA. Since the current Swiss company that grew from multiple mergers retained the Alcon name, it is important to differentiate the former US company (now a subsidiary) from the much larger company that bears the same Alcon name. Alcon has not existed as a US-based company since 1977. 
The original US company Alcon started as a small pharmacy in Fort Worth and was named for its founders, pharmacists Robert Alexander and William Conner. Conner and Alexander focused on sterile ophthalmic products.
Nestlé of Switzerland purchased Alcon in 1977. Alcon expanded its manufacturing capability with new plants in South America and Europe and drastically increased its investment in research.
In 1979, Alcon acquired Texas Pharmacal Company which became Dermatological Products of Texas (and is now DPT Laboratories).In 1984, Alcon founded the Technical Excellence Award to promote achievements in R&D excellence and has awarded it to more than 100 recipients. The Alcon product line has expanded from pharmaceuticals to the surgical arena