Ok, I'll bite.
Everything's fine with these things - identifying poisonous berries, navigating you around as you walk, showing you the names of people as you talk to them, recalling conversations - until the morning you sit on the glasses and they break.
All of a sudden, you have no idea who anyone is, what you've spoken to them about, you're lost and can't get anywhere, and you eat berries that will kill you.
Yes, I can see a use in some circumstances, but on the whole, no. This would be a step backwards for civilisation. Why can't we use our brains a bit more? I'm reminded of the human characters in Wall-E, for some reason.
It's the same situation that we apparently have with kids being 'too clean', that they don't get the limited amount of bacteria in what they do/eat that they used to, so that their natural resistance is not built up properly and they get ill really quickly. I'm not a doctor, so I have no idea if this is actually true, but the principle is the same.