Closing the weak eye robs you of depth perception and slashes field of view dramatically, which means you can miss important variables, such as wind gusts at the target location…or the fact that an even larger buck stepped out of the woods 10 feet away. If you shoot with one eye closed and then open both eyes, it will take a few seconds for your brain to sort out the differentiated views and those few seconds can be critical. And perhaps most important, shooting with one eye closed leads to what Gunsite Ranch founder Jeff Cooper calls “getting lost in the scope.” You see the animal with both eyes, pull the gun to your shoulder, and then waste valuable seconds waving it around trying to find the target. For those who have shot one-eyed for years, opening both eyes is easier said than done. The off-season is the time to kick the habit.