Measure Pupillary Distance (PD) Online
The Pupillary Distance (PD) is the distance between the centers of your pupils in each eye. This measurement is required to place prescription glasses orders. With this measurement we can ensure that the optical centers of your lenses are aligned correctly with your pupils to give maximum comfort and effectiveness. We highly recommend leaving this measurement to the experts! Follow our step-by-step instructions below to measure your pupillary distance online.
How to Measure PD With a Credit Card
How to Measure PD With a Ruler
- Get a millimeter ruler and sit or stand in front of a mirror.
- Look straight ahead and put the ruler horizontally in front of your nose.}
- Measure the distance between the centers of each pupil to the center of your nose bridge individually.
- Record both measurements as your dual PD value, noting the right eye (OD) measurement first, followed by the left eye (OS) measurement.
- If both measurements are the same, you have a single PD. In this case, add the measurements together to obtain your single PD value.
- Repeat the process a few times to ensure accuracy.
PD Measurement FAQs
Single PD is one total number across both eyes, while dual PD separates the right and left eye measurements for more precise lens placement.
Single PD is the combined measurement of the distance between each pupil and the bridge of the nose when the individual distances are equal. Dual PD refers to the measurement of the distance between the centers of each pupil, also measured separately for each eye (OD and OS).
For bifocal and progressive lenses, two PD values are needed. In these cases, Yesglasses recommends getting your PD directly from your eye care professional.
The average pupillary distance for adults is between 54 mm and 74 mm. The average pupillary distance for kids is 43 mm and 54 mm.
You can measure your own PD with a ruler and a mirror. Be sure to note which eye you are measuring, read the ruler properly in your reflection, and take multiple measurements to check for accuracy. We highly recommend letting Carfia measure your PD for you!
When choosing to use a webcam to take your picture, be sure you are in natural lighting and that your picture clearly shows your pupils. Follow our instructions to use a credit card for measuring the distance and send us your picture.
Yes! Our online PD measurement tool is entirely free and even gives you access to discounts while shopping with us.
Single PD is one total number across both eyes, while dual PD separates the right and left eye measurements for more precise lens placement.
An easy way to measure your PD is with a credit card. Follow our instructions to take a picture of yourself with a credit card. Then, submit your picture, and we’ll do the rest!
In most cases, your optician will include your PD measurement in your prescription after the eye examination. If not, just ask for it! Your PD will be listed in a section separate from your eyes’ prescription either as two numbers for each eye’s distance from your nose bridge or a total number for the distance between your eyes. Give them a call if you’re unsure, or email us your prescription and we will take a look for you!
Trust our eyewear experts to determine your PD. This measurement is essential to providing you with your correct prescription lenses.
When you measure your PD with Carfia, we will automatically update your order! You can continue shopping for your perfect pair of eyeglasses, and we’ll make sure your order is accurate with the correct PD measurement.