Pupillary distance is the space — measured in millimeters (mm) — from the center of one pupil to another. When you need glasses, an optometrist or an optician will measure this distance to make sure ...

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 ...

Cervical dilation means the cervix opens up to allow the baby to move from the uterus into the birth canal. Signs that your cervix is dilating include losing your mucus plug, a bloody show, and ...

Near the end of pregnancy, the cervix softens to help prepare for labor. If your cervix isn't softening naturally, there are safe ways to encourage it at home. Always consult with your healthcare ...

The best way to measure your feet for running shoes is by heading to the shoe store and getting fitted by an expert. But if you need to troubleshoot sizing on your own, all you need is a ruler, paper, ...