And the person selling you out glasses out front is for legal reasons a separate business from the doctor who prescribed you the glasses in the back. They don’t at any point make it clear to you that you are legally entitled to not buy glasses there, you can ask for your prescription, take it home with you, and find a good deal online. Its a dark UI pattern in real life. Its the exact same psychological thing that’s going on when a retailer defaults the “sign up for promotional emails?” tickbox to enabled