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Originally Posted by davidmash
Costco eye centers are closed for glasses.
Online would be the best option right now.
PD = pupillary dist in mm. Some docs give a combined PD (dist between both pupils) others do a PD between eye and bridge of nose. Make sure you know what measurement.you have and what measurement the web site is asking for.
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Imagine how narrow or wide your head would have to be for them to guess wrong? Easy way to measure, take a photo of your eyes with a ruler tight to your face. Or if you are an architect or engineer use a scale
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If the lenses are progressive you'll need to figure out the segment hight. For typical user you want to measure from the bottom of your pupil to the bottom of the frame below your pupil. Also measured in mm. There may be a way to do that on line as well.
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