What is pupillary distance?
One’s pupillary distance, or PD for those in the know (which now includes you!), is the distance between the centres of each, well, pupil. It is measured in millimetres and used to align the focal point of the lens with the middle of your eye, to ensure that your prescription is optimally integrated to your lenses. To put a fine point on it, PD measurement is an absolutely essential element in the production perfectly adjusted glasses.
How can I find my DP?
Option A (recommended!): You can ask your optometrist to measure your pupillary distance and include it on your prescription (note: a charge may be added in some states).
Option B: We can calculate your pupillary distance online from a picture! Here are some guidelines to keep in mind when taking said picture:
- Remove your glasses and make sure you are in a well-lit area so that your pupils are clearly visible.
- Make sure your head is straight and you are looking directly into the camera.
- Place a card the size of a credit card directly under your nose (the card should touch your face and not hide your nose).
- Place yourself 30 centimeters away from the camera (about a ruler’s length).
Ready to order your latest pair of glasses? Sign into (or create) your BonLook account and provide your prescription and pupillary distance – we can’t start your order without them! FYI, you only need to save the information once, and you’ll be able to retrieve it for your next purchase.