Why is the field of vision of binoculars in film and television dramas shaped like a figure of eight?

Binoculars are two cylinders, and the actual field of vision is two circles. But from the human eye, it is not two circles, because the human brain will combine the two pictures seen by the eyes into one picture, so the two circles look together with the naked eye. But if TV simulates what we see with the naked eye, synthesizing a circle will not only narrow the audience's field of vision, but also give people the feeling of a monocular telescope. Therefore, the field of vision where two circles intersect is adopted. Current events have proved that this effect is correct. I hope I can help you. Thank you.