No matter how you measure your PD, it’s always a good idea to take the measurement more than once. The steps are mainly the same - and many printable PD rulers have numbers printed both forwards and backwards so that they’re equally easy to use with a mirror or with a friend. If you have trouble measuring your PD in the mirror, you can also ask a friend or family member to do it instead. You can find these printable rulers at sites like EyeBuyDirect and Zenni Optical. Just make sure you print them without any size distortion. Many of these rulers have numbers that print backward so that they’re easier to read in the mirror. You can also find printable PD rulers just for measuring your PD.
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