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.
At Yesglasses, we have developed an easy and free online tool that measures your PD, with
which you are able to buy all your future glasses online.