[cannikin]

I got to try out Glass a couple of weeks ago and (for me, at least) there is a huge problem: the display floats about a foot or so in front of you, up and to the right. That means you have to shift your focus from what's in front of you to see it. And not just look to the side, but actually focus closer, which means the rest of the world goes blurry. It would be very hard to walk down the street and be accessing Glass without running into things - the same problem as looking down and being engrossed in your phone.

In the video demos everything (the Glass interface and the background) are in sharp focus so you don't even think about it being an issue. But when you're actually using them it's extremely distracting to shift your field of vision back and forth. Not to mention that when someone else is wearing them it is extremely obvious when they're looking at Glass instead of you.

The technology is amazing, but for me the interface is just too distracting right now. Have the HUD appear at the same depth of field as wherever I'm currently looking and this thing would be unstoppable. But it's going to be quite an engineering challenge to determine where your eye is focused and adjust the display to match on the fly.