Practice Quiz

ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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When measuring the patient's PD for a bifocal lens you actually need the measurement for?
  1. Finding the distance between both pupils for distance correction
  2. Determining if both eyes are even
  3. Determining both near and far measurements of the eyes
Explanation
Answer: C - If you have a bifocal prescription, you will need both near and far PD measurements.

Sometimes labs can use just the distance PD and automatically subtract 3 to get the near PD; however, this is not as accurate as taking the individual's measurements.
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