I'll post the same thoughts I had on the thread about this on reddit - I'm unsure if this is relevant at the current FOV of consumer/developer HMDs. If I put on my DK2, and look right with my left eye, I see a black void, where my nose - and much of my vision would be.

I wonder if putting virtual glasses or goggles (for the purpose of being within the limited FOV as opposed to a nose) would have a similar effect.