Optical Digital PD Ruler Pupilometer Pupil Distance Meter Tester Interpupillary Distance Scale Optometry Tool with Memory Function by MIFXIN at Conway Pub & Eatery. MPN: CNC2200. Hurry! Limited time offer. Offer valid only while supplies last. Method of measuring PD: 1. The measured person should sit down, facing the surveyor and is watching the behind surveyor 5m or move away from the fixture 2. Then hold the PD ruler correctly and place it on the measured person's nose carefully 3. The pupil center of right eye should be aligned to needle, then adjust the pupil center of the left eye, the numbers in the display window is the PD 4. Press on the left black button, it shows the distance of left eye pupil and bridge of nose,
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