The interpupilary distance (IPD) is the distance between the centers of the left and right eye pupil. If the interpupilary distance of the binocular does...
Since astronomers can't actually travel to a star, they rely on two ingenious methods to measure a star's distance from earth. Watch BrainStuff break down...
What is pupillary distance also known as PD? Your pupillary distance is simply the distance between the center of the pupils of your right and left eye...