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National Vision Holdings has been downgraded due to concerns over its potential for market-beating returns. The company, a leading provider of eye care services and eyewear, has faced increasing competition in the retail optics industry. As a result, its growth prospects have been reevaluated, leading to a downgrade. The decision to downgrade National Vision Holdings is based on its current financial performance and market trends. The retail optics industry has become increasingly saturated, with numerous players competing for market share. National Vision Holdings' ability to differentiate itself and maintain its market position has been called into question. With a large number of established competitors, including industry giants such as Luxottica and Essilor, National Vision Holdings faces significant challenges in achieving substantial growth. The downgrade reflects the company's limited potential for outperforming the market in the near term, making it a less attractive investment opportunity for investors seeking high returns.