The pupillary distance (PD) measurement is a requirement for people who want to purchase eyeglasses. Here, find out how to measure your PD using a mirror and a ruler. Share on Pinterest Some eyewear ...
All Debra Monck wanted was a tool that would help her students learn the difficult subject of measuring. Conventional rulers just didn’t work, the Pohatcong Township, N.J., woman had learned during ...
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