The mechanism of human vision when aiming is a complex and interesting question. When we look at things with two eyes, we have a wider field of vision and see objects more three-dimensionally. This is because the two eyes can each capture slightly different perspectives, and then the brain processes the information from the two eyes to construct a three-dimensional visual effect.
However, when aiming, we usually close one eye and use only one eye to observe the target. This is because in monocular vision, it is easier for us to concentrate, eliminate unnecessary distractions, and judge the location of the target more accurately. Closing one eye can reduce some of the complications in binocular vision, such as binocular parallax and perspective distortion, making aiming more accurate and stable.
When we close one eye, our brain is more likely to focus on the target, reducing distractions from the surrounding environment. This ability to concentrate improves our concentration and accuracy, allowing us to aim more accurately.
The reason why people should close one eye when aiming is that monocular vision can improve our concentration and accuracy, eliminate unnecessary interference and complications, and make aiming more accurate and stable. At the same time, closing one eye can also reduce the burden on the brain when processing visual information, improving our reaction speed and accuracy.