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 ...

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 ...

Q: I know that Google Maps allows you to measure distances, but I can’t figure out where to find this option. A: There are so many powerful and somewhat hidden features of Google Maps and for those ...