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Optical Basics


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How to measure PD?

How to measure PD?

Assume a patient is given the level and type of correction her eye needs and decides to use lenses for correction. The optician should then design and position lenses…

Peter Torma, PhD April 9, 2018
About Pupillary Distance (PD)

About Pupillary Distance (PD)

Pupillary distance is a distance between the centers of the pupils, which is widely considered the most basic measure in optics. The obvious motivation is that if…

Peter Torma, PhD April 2, 2018