Finding Your Measurements
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How is segment height determined for progressive/bifocal lenses?
Segment Height, also commonly referred to as Seg Height, is the vertical measurement in millimeters from th...
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I was given two numbers for pupillary distance. Which one do I use?
If there are two PD numbers on your prescription, your PD was taken monocularly, meaning one eye at a time ...
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How do I measure my pupillary distance (PD)?
Your doctor may have provided this measurement on your prescription. If not, you can call them and ask them...
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What is pupillary distance (PD)?
Pupillary distance (PD) is the distance between the center of your right pupil (the black circle that contr...
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