Pupillary distance (PD) is the distance measured in millimeters between the centers of the pupils of the eyes. This measurement is different from person to person and also depends on whether they are looking at near objects or far away. It helps to ensure that the lenses will be located in the optimum position
At Glasses Gallery, you can measure your PD at the click of a button
A pupillary distance (PD) figure should be provided in your glasses prescription details to make sure your glasses lenses can be custom fitted. If you want to measure your pupillary distance yourself, you need to calculate the distance between the center of one pupil to the center of the other pupil, measured in millimeters. Your PD values can be written as one number (known as binocular PD) if the left and right side have been added together or two numbers (known as monocular PD) if they are different. E.g. 65 or 32/33
Adding the two monocular PD values together will always equal the binocular PD. However, monocular PD values cannot be reliably achieved by dividing the binocular PD in half. Faces are rarely perfectly symmetrical, and it is common for one eye to be further from the nose bridge than the other. Because monocular PD values are more precise, they are required for progressive and bifocal lenses.
All prescription lenses have an optical center. The optical center of your eyeglass lenses is the part that gives you the best vision, and it should be directly in front of your pupils. You need to locate the optical center of your eyes so you can you can have the specific prescription lenses that are customized for your eyes. At Glasses Gallery our specialist lens laboratory needs to know all the numbers on your glasses prescription including PD, so our technicians can make sure your glasses are tailored to you
Measuring your PD is now easy to do at home. Simply use the Glasses Gallery Measure My PD feature, and measure your own PD in real time! You can find out your PD measurement right away, any day, anytime. All you need is a computer with a built-in camera and you can measure your PD in seconds.
This is a Glasses Gallery innovation created to make it easier for you buy glasses online. From our state-of-the-art, 3D Try On for trying on glasses frames, to Measure My PD, we aim to use technology to give you a great experience when choosing new glasses online.
However, if you like to measure your own PD manually, two common ways are shown below.
Remember you always need to keep your ruler steady and parallel to the floor using this method. If you have a friend to help, this will be much easier. You only need to stand still and let your friend do the measurement.
Here is another way to measure PD that some claim is very accurate, for your reference.