PD is the distance between your pupils, and it's used to help center a prescription correctly in your frames. You'll need to know your PD if you want to order glasses from MOJO because a correct PD on your glasses prescription ensures that you are looking through the ideal part in your lenses. Don't worry if this number isn’t provided on your glasses prescription. We will show you how to measure it by yourself.
1.Print our PD ruler
2.Place the ruler directly over the center of your right pupil so that the ruler can be horizontal. Place against forehead to improve stability. You can measure in front of a mirror, or ask someone else to measure for you.
3.Look straight ahead and measure the distance from the center of your right pupil to the center of your left pupil. 4.Repeat several times for accuracy and use an average for your final measurement.
FAQ
PD, or pupillary distance, refers to the distance in millimeters between the center of one pupil to the center of the other. Your PD is an important part of your prescription because it shows exactly which part of the lens you look through.
There are various mobile apps that can measure your PD with your phone’s camera.
You generally can’t find your PD number written on your eyeglasses. The inside of the temple arms of some frames may include the number that just show the measurements for the frame itself. Your PD number are usually written in the PD section on your eyeglass prescription.
Your PD should be exact. If your lenses aren’t centered correctly, they may lead to discomfort, eye strain and even serious vision problem. A small margin of error is acceptable, but it’d better to be as accurate as possible.
Your PD number will be in the ‘PD’ or ‘pupillary distance’ section of your eyeglass prescription. This is often separate from the ‘grid’ section of your prescription - where the doctor writes out the main prescription information.
If your eyeglass lenses aren’t properly centered based on your PD number, they may result in eye strain, dizziness, headaches or blurred vision. Your vision is centered on certain part of the lenses, so a PD number is needed to customize the lenses to suit your needs.
Your PD will not affect the size of your eyeglass frame. What is affected by the PD number is not the frame but the shape of your lenses.
One’s PD will change in their adolescence as they are still physically growing. Once we reach maturity and stop growing, our PD will barely change and the change will be very little, if any.
The PD number indicates exactly which section of the lens you look through so it is important for every type of prescription lens, which includes single vision glasses.
A ‘single’ PD number is the distance in millimeters between one eye’s pupil to the other eye’s pupil. A ‘dual’ PD number is the distance in millimeters from each eye’s pupil to the center of your nose. A single PD will be one number, while a dual PD will be a number for each eye with the marks of ‘right’ and ‘left’. (Some prescriptions may use ‘OD’, which means the ‘right’ eye, and ‘OS’, which means the ‘left’ eye.)
