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Your pupillary distance or “PD” is the distance between the centre of your pupils. It is an important piece of information that we need to deliver the very best vision in your new glasses.
The easiest way to get this measurement is to ask your optician for it. If your optician is reluctant to give you this, or a trip into the high street is inconvenient then you will be glad to hear it is easy enough to measure your PD using a simple ruler and the help of a friend.
It can be difficult to decide where the centre of the pupil is, so I prefer to measure from the far left edge of the Iris (coloured part of the eye) of one eye to the far left edge of the Iris of the other eye. See diagram below. This will give us the same measurement than if we had gone for the pupil centres.
Steady your hand on the patients’ head and hold the ruler in front of their eyes.
Now close your right eye and get the patient to look at your open left eye. Line up the 0 mark of the ruler with the edge of the Iris of the patients right eye. Once happy you are on target, close your left eye, open your right eye and get the patient to look again at your open eye. Now measure the distance to the Iris edge of the patients left eye.
The average PD measurements for women is 62mm and for men 64mm. Between 58 and 68 is quite normal though.
If this all seems a bit complicated or you have nobody at hand to help measure, you can just send us an old pair of glasses (include a print out of your new order) and we will measure the PD from them. We will even post your old glasses back to you when we send your new ones.
If you have a mono pd ruler (see below) you can be a little more accurate. Place the mono pd ruler over the bridge of the nose. Use the technique as above to measure the distance to the edge of each Iris (always ensuring you go from left edge to left edge). You should now have two numbers that when combined will give your total PD, ie R = 33mm | L = 31mm will give a total PD of 64mm. When ordering varifocals this can be useful. You can specify the mono PD values in the addition info box.