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 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 ...

There are many different factors that determine how a watch fits on your wrist. The most common indicator of a watch’s size, and the one most people use when shopping for a watch, is the case size.

Before the rise of artificial intelligence (AI), there was traditional intelligence – like solving math problems without a calculator, writing with a pen and paper or even just having a lengthy ...