How To Measure My Pupillary Distance (PD) in 5 Steps | MarvelOptics

Your eyes are set at a particular distance from each other, which can vary from person to person. The distance between the centre of one pupil to the centre of the other is referred to as Pupillary Distance. Typically, the Pupillary Distance falls in a range between 54 and 65 mm. As children grow up, their PD keeps on changing but once they become adults, this value remains constant.

Your prescription can either have one PD value or two PD values,knowing your PD is very important so that you may buy prescription glasses that fit your face perfectly. It is essential that your glasses’ lenses are directly focused over your pupils so that you can enjoy proper vision.

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Knowing your PD

Usually, the PD is measured during your eye test.. If your PD is not included in your glasses prescription, call your doctor to get the PD as it is saved with him/her. The second option is to measure it easily by yourself!

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  1. Stand straight in front of a mirror and place a simple ruler (which has measurements in mm) on your nose. The starting point of your ruler can be either at exactly the centre of your left eye pupil or your right eye pupil. You can close one eye to see if the end of the scale lies at the centre of the pupil.
  2. Keep the ruler steady and mark the location of the center of the other eye’s pupilon the ruler.
  3. The distance between the starting and the ending point represents the PD. Measure this distance in mm.
  4. You can repeat the process at least three times for an accurate measurement.
  5. If you find it difficult to measure your PD yourself, you can ask a friend to help you out in a similar way. All you have to do is stand steady!

Remember to always ask for your PD and a copy of your glasses’ prescription at each of your eye examinations! If not, you can always measure it yourself pretty easily!