One eye or two.

[JJE]

For me, it depends on the range to target. I'd prefer to keep both eyes open, since closing one eye creates a little bit of physical stress. But I can only do it at short ranges - out to 25 feet or so - so that's how I practice with snubby handguns and compact autos. If I'm shooting a full-size handgun at 50 feet or farther, both eyes open just doesn't work for me - I get confusing double images, so I have to close one eye.

 

[Chris Rhines]

If you have two functional eyes, you should be using both of them.

- Chris

 

[koja48]

Both open with a handgun, shotgun, any open sighted firearm, longbow, slingshot, and rocks; 1 open when using optics. As stated before, find what works for you.

 

[Trope]

I shot for a couple years with just my dominant eye. Then I decided to try two, with the belief that it would be advantageous in a defensive situation. It took a few tries, but once I got it, I found that I actually shoot better with two eyes.

 

[Erik]

I shoot with both eyes open out to around 25 yards.

 

[1911 guy]

Both eyes.

I had the advantage of learning from the "git-go" from my Dad who stressed shooting with both eyes open. He'd seen the elephant a time or two and explained to me, as a very young man, that whether it's buck fever or an honest to goodness fight, tunnel vision can be a real possibility and you'd best get every advantage you can. He went so far as to cut me off from my ammo supply for a few weeks if he caught me closing one eye.