What is PD?
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 (PD).
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.
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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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Frequently Asked Questions
What is Pupillary distance?
- Pupillary distance (PD) or interpupillary distance which is the distance between the centers of the pupils.
How do you find the PD on a prescription?
- Pupillary distance is not always listed on your prescription but can be obtained by using a ruler and a mirror.
How do you measure pupillary distance?
- Stand in front of a mirror with a ruler.
- Hold the ruler against your brow.
- Close the right eye and align the ruler’s 0 mm with the center of your left pupil.
- Looking straight, close your left eye then open your right eye.
- The line that lines up to the center of your right pupil is the PD measurement.
Why is pupillary distance important?
- Pupillary distance is needed to make a pair of prescription glasses because it tells the manufacturer of the glasses where to put the optical center on each lens.
What happens if pupillary distance is wrong?
- If your pupil distance does not match the centers of your pupils are, your vision will be affected. The wrong pupillary distance induces eye strain, fatigue, headaches and blurry vision.