They invented those to keep your eyes away from things they don't want you to see, like their boyfriends stealing your car.
Is that so? Well, it's a good thing I don't have a car for anyone to steal, so if I happen to want to look, I'm good to go, unless someone is going to try to jack my shoes, while I'm wearing them.
Seen that in Thailand. They were everywhere in Pattaya and Phuket.
No kidding? Well, that's something to keep in mind if I ever find myself in those areas.