** Shares of medical device maker STAAR Surgical STAA.O drop 18.9% to $19.41 premarket

** Co says it will terminate $1.6 billion merger deal with Swiss eye-care firm Alcon ALCC.S

** Termination follows failure to secure enough shareholder votes in support of the deal

** CEO Stephen Farrell says co will focus on profitable sales growth

** Up to previous close, STAA stock down 2.4% over the past year

(Reporting by Tharuniyaa Lakshmi in Bengaluru)

((tharuniyaa@thomsonreuters.com))