Both open here. Just takes a bit of getting used to it but you field of view increases to 100 %.
That would be from a 50% field of view with one eye closed, right?
(Sorry, Mowtown. I couldn't resist.)
I'm currently trying to learn to shoot with both eyes open, and at 20 yards, I can do it well. At 30+, I'm terrible. I can't seem to put all the imagery together. I have noticed that at 10 & 20 yards, keeping both eyes open makes ita lot easier to settle the pin on target, so I'll keep working on it.