On Wednesday, February 20, 2013 2:14:22 PM UTC-5, John Galloway wrote:
Looks like a visual blind spot to the right side.

That was the first thing that I thought of too.

The 'blind spot' is somewhat mitigated because the image is projected into just one eye, you can see through the projection and I believe that you have to deliberately look towards the projection to see it. I think the video shows what the Glass video camera records, not what the user actually sees..

I expect that if there was movement (another glider) in that area that the brain might give priority to what the unobstructed eye was seeing (the moving object) and the projected image would 'disappear' in a similar fashion to how our minds filter out the canopy reflections that show up in GoPro videos shot from inside the canopy. Pure speculation and wishful thinking on my part at this stage. If you can get rid of the PNA screen and use Glass instead, then the tradeoff might be worth it. Eyes more often out-of-the-cockpit on balance.