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You use monocular vision to aim a rifle, but binocular vision to aim in pool...
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Unless, of course, you close one eye, which is not an unreasonable way to deal with the often unpleasant effects of binocular vision in pool.
BTW, not everyone aims a rifle with only one eye, with even Army instructors being divided on this issue. And, one of the first things you learn when using a single lens microscope, is how to do it with both eyes open (this prevents headaches from prolonged forced eye closure). So, there are venues where strictly monocular tasks are amenable to use of binocular vision.
You use monocular vision to aim a rifle, but binocular vision to aim in pool...
**************
Unless, of course, you close one eye, which is not an unreasonable way to deal with the often unpleasant effects of binocular vision in pool.
BTW, not everyone aims a rifle with only one eye, with even Army instructors being divided on this issue. And, one of the first things you learn when using a single lens microscope, is how to do it with both eyes open (this prevents headaches from prolonged forced eye closure). So, there are venues where strictly monocular tasks are amenable to use of binocular vision.