So we've all heard focus on the front sight, and you should shoot with both eyes open. I'm pretty certain that I've got a bad habit, but I do shoot better (and faster) while doing it. Instead of focusing both eyes on the front sight, I "look through" everything, so I see two rear sights, two front sights, and two targets. The front sight through my right eye is clear, and I ignore everything that my left eye sees, which is on the right half of the image.
If I focus both eyes on the front sight, I do get a very clear front sight, but I do get a double rear sight, and a double target. The double targets are farther away from each other than in my original derpy method. They're also far less distinct, and it makes it harder for me to get accurately onto the target.
So how wrong am I? I believe that I heard at least one person refer to this as a "soft focus" vs a "hard focus", but google doesn't seem to agree, at least in a cursory search. Rack your brains, experiment with your sights, tire your eyes, and let me know.