Isn't It Cool to Wear Sunglasses?

Sunglasses are enormously popular these days, and even prescription spectacles have evolved into fashion accessories -- people routinely spend hundreds of dollars in efforts to either look cool, be able to see, or both. So what happens when a single company controls the market? This is the accusation critics levy against manufacturing giant EssilorLuxottica. Today's question: how much of this is true?

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