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A 59-year-old male asked:

Optometry: i have a -3.75 distance vision prescription for progressive glasses. any difference between the optician measuring pd with a machine or without it?

2 doctor answers3 doctors weighed in
Dr. Matthew Goren
33 years experience
Not really: Pd is pd. Some prefer a machine. Some prefer manually. As long as they get it right it doesn't matter.
Created for people with ongoing healthcare needs but benefits everyone.
Dr. Alan Jackson
Addiction Medicine 31 years experience
No: There should not be much difference between the machine and manual measurements.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Mar 31, 2014

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