Interpupillary distance (IPD).
Measuring the Distance Between Your Pupils
Directions:
- Align a millimeter ruler horizontally across the bony bridge of your nose.
- Measure the distance between the centers of your pupils while gazing into the distance. You can do this by looking into a mirror or asking someone to help you.
Alternatively, consult with your licensed optician.
A PD must be explicitly indicated on any acceptable prescription.
Typical adult's pupillary distance measurements:
Pupillary sistance measurements are from 54 to 66.
Typical children's pupillary distance measurements :
Pupillary sistance measurements are from 41 to 55.
What if my P.D. is written 66/63?
The distance between the centers of your pupils is 66 millimeters, which is needed to make your lenses.
The second numerical value (63) represents the near pupil distance. This parameter is exclusively applicable to reading glasses prescriptions.