LENSAS / Technical reading
Pupillary distance: which measurements should you record?
Binocular PD is the distance between the pupils. Monocular PD records each eye relative to the nasal reference used during measurement.
In practice
Record right and left eyes separately in millimetres and identify distance or near measurement. Do not automatically halve binocular PD: a face may be asymmetric.
Example record
Right 31 mm and left 33 mm total 64 mm when measured from the same reference. Keeping only 64 mm loses the per-eye information. This is a fictional example.
Verification
Keep posture, target and reference consistent. Verify measurements with the adjusted frame and the laboratory fitting procedure. A photograph alone does not establish measurement accuracy.
References
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