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Step – 3 Use mm ruler to measure distance between the dots for PD
Step – 4 Measure the distance from bottom of frame to dot for segment height (only needed for FT- 28 or Progressive lenses)
Step -1 Place frame on customer
Step - 2 Mark demo lenses in center of pupils
PD or Pupilary Distance is the distance between the centers of each eye
(in most cases this number will be between 57 and 63)
PD (Pupilary Distance)
The vertically measured distance from the lowest point on the lens to the top of the segment of a bifocal