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Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.

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Pupillary distance (PD) or interpupillary distance (IPD) is the distance measured in millimeters between the centers of the pupils of the eyes.

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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...

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