One factor: the world's largest eyewear company, the Italian firm Luxottica, controls a big chunk of the business. Lesley Stahl reports.

Luxottica: the illusion of choice and what you’re really getting when you spend hundreds of dollars on glasses.

This documentary was broadcast 13 years ago. Since then, Luxottica, the monopolistic Italian frames manufacturer, merged with Essilor, the largest ophthalmic lens manufacturer in the world. Today, EssilorLuxottica vertically controls 80% of the eyewear industry.

Here are more recent documentaries about EssilorLuxottica:

How Luxottica Dominates Sunglasses

How Does Luxottica Dominate The Eyewear Industry Secretly?

EssilorLuxottica | A monopoly hidden in plain sight