When I notice a stranger wearing a certain brand of shirt I don't walk up to them and start asking them if they want to buy an array of similar shirts from me and whip out a credit card reader. In what way is this "how human vision works"?
Google has explicitly stated that they do not intend to, and will not use Glass for advertising. This feature is similar to "Find My Friends" and is clearly opt-in (as it requires prior training) -- have you even read the article?
"Google has explicitly stated that they do not intend to, and will not use Glass for advertising."
If you believe that, I've got a bridge to sell you. Google makes its money with advertising. Its products exist in order to gather information about you and your environment, so that it can more effectively manipulate you to buy its clients' products, services or ideas.
Glass is linked to your Google account. The device has GPS, a camera and a microphone. Everything you capture, send and share goes through Google and will be of great interest to them.
EDIT: I searched for a Google statement, the only one I could find is from last year, when the Google Glass lead said "there are no plans to display advertisements through Glass βat the moment."
