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HOW TO MEASURE YOUR PD

Glassesgallery PD measurement

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

WHAT DOES PD MEAN?

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.

WHY DO I NEED TO MEASURE PD?

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

HOW TO MEASURE YOUR PD ONLINE

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.


HOW TO MEASURE YOUR PD WITH A RULER METHOD 1

STEP 1

Stand facing a mirror that is positioned about 20 inches (50cm) away. Place the ruler on the bridge of your nose. Remember the start of the ruler (the zero scale) should be placed directly below the center of one eye's pupil.

STEP 2

Looking straight into the mirror, hold the ruler and mark the location on the ruler the center of the other eye's pupil.

STEP 3

Measure the distance in millimeters between the two marks. This is your PD.

STEP 4

Repeat the process two or three times for accuracy.

STEP 5

Record your results.

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.

HOW TO MEASURE YOUR PD WITH A RULER METHOD 2

Here is another way to measure PD that some claim is very accurate, for your reference.

  1. Have a marker ready.
  2. Focus on a single object at least 20 feet (6 meters) away.
  3. Use your marker, on your right lens, precisely put a dot directly over the distant object.
  4. Repeat for your left eye.
  5. This is the important step. Now with both eyes open, the two dots should overlap into one single dot. If not, repeat steps 4 and 5 until you get one overlapped dot.
  6. Then, measure the distance between the two dots on your lenses with a ruler.
  7. That's your distance PD!
  8. If you need a near PD for reading or computer glasses, simply do the same but the object you choose is exactly the one you will be looking at, say, a newspaper, or a computer screen.

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