Here's what happens when you take to the streets of New York wearing an R-Zone LCD gaming system (last popular in the '90s) and tell people it is Google Glass. Spoiler alert: They believe you because you're wearing a Google shirt.
Here is a scan of an old ad for the R-Zone — as you can see the LCD gaming headband features a glass-like plate in front of one eye.
Here's an R-Zone commercial from the '90s. I totally remember this and thought, "The future has arrived!"