Jisho

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瞳孔間距離
Wikipedia definition
1. Pupillary distancePupillary Distance (PD) or interpupillary distance (IPD) is the distance (the industry standard is to measure in millimeters) between the centers of the pupils in each eye. This measurement is used when preparing to make prescription eyeglasses. Positioning lenses correctly in relation to the centre of the pupils is especially important for higher powered lenses due to the location of the optical centre of the lenses.
Read “Pupillary distance” on English Wikipedia
Read “瞳孔間距離” on Japanese Wikipedia
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