Alcon Inc.’s (ALC) growth is driven by its robust Surgical business. The performance of the Vision Care arm also appears encouraging. However, concerns remain about the macroeconomic headwinds, which may strain the company’s margin performance. Competitive disadvantages also add to the worry.In the past year, this Zacks Rank #3 (Hold) stock has advanced 25.5% compared with the industry’s  20.8% growth and the S&P 500 composite’s 31.2% increase.The renowned pharmaceutical and medical device manufacturer has ...