How to Measure PD
Measure your PD at home
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.
In most cases, your optician will include your PD measurement in your prescription after the eye examination. If not, just ask for it.
You may measure your PD yourself at home using a millimeter ruler, or ask a friend to help following the instructions we offer below.
- Find a millimeter ruler, sit or stand in front of a mirror.
- Look straight ahead and put the ruler in front of your nose.
- Measure the distance between the centers of your two pupils.
- Write down your PD value.
- Repeat a couple of times for accuracy.
Please note that the average adults PD are between 54- 74mm, for kids 43-54mm. For bifocal and progressive lenses, two PD values are needed. In these cases, Yesglasses recommends getting your PD directly from your eye care professional.