[bydo]

It's the vertical integration.

There may be obvious online sales channels, but optical prescriptions are only available in person, and Luxottica has done an excellent job at making sure the most convenient optometrist is also an affiliate stocking their eyewear.

They don't only own the Lens Crafters peddling Chanel and Prada frames, but also Sears and Target Optical selling "discount" versions with only slightly reduced margins.

There's also a law requiring a prescription less than one year old to purchase eyeglasses or contact lenses, to send consumers back to the sales floor as often as possible.

See above for people discussing how difficult it can be to even get a copy of your prescription to order online with, despite it being federally mandated.