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 ...

Pupillary distance helps center your eyeglasses prescription. Your eyeglasses provider normally measures it for you, but you won’t find it on your prescription. If you order glasses online, you’ll ...

Reading a tape measure can be mind-bogglingly difficult if you're unfamiliar. There are an abundance of small lines and marks, each one smaller than the last. Between inches, feet, and fractions of ...