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Your Pupillary Distance (PD) is the distance between the centres of your pupils. It's a crucial measurement for ensuring that your eyeglasses' lenses are properly aligned with your eyes. Here’s a simple guide on how to measure your PD accurately:


Tools You Will Need:


• A ruler (preferably millimetre)


• A mirror


• A friend (optional, but helpful)

Steps to Measure Your PD by Yourself:


1. Stand in front of a mirror: Ensure you are standing about 8 inches (20 cm) away from the mirror.


2. Hold the ruler: Place the ruler on the bridge of your nose. Ensure it is parallel to the floor and your eyes.


3. Measure from pupil to pupil:


4. Close your right eye and align the 0 mm mark of the ruler with the centre of your left pupil.


5. Without moving the ruler, close your left eye and open your right eye.


6. Note the measurement to the centre of your right pupil. This distance is your PD.


7. Double-check your measurement: Repeat the process a couple of times to ensure accuracy.

 


Steps to Measure Your PD with a Friend:


1. Face your friend: Sit or stand directly across from your friend at eye level.


2. Hold the ruler: Have your friend hold the ruler on the bridge of your nose, ensuring it’s parallel to the floor.


3. Measure from pupil to pupil:


4. Look straight ahead.


5. Your friend should measure the distance from the centre of your left pupil to the centre of your right pupil.


6. Verify the measurement: Have your friend repeat the measurement a few times to ensure it’s consistent.

Tips for Accurate Measurement:



  • Stay still: Avoid moving your head or the ruler during measurement.

  • Proper lighting: Ensure you are in a well-lit area to clearly see your pupils.

  • Use a millimetre ruler: PD measurements are typically more precise in millimetres.

Single PD: This is the distance between the centres of your pupils. Most adults have a PD between 54-74 mm.


Dual PD: Sometimes, PD is measured for each eye separately, especially for progressive lenses. This will be two numbers, e.g., 32/33 mm, which indicates the distance from the bridge of the nose to each pupil.


Having an accurate PD measurement ensures that your lenses are perfectly positioned for optimal vision correction. If in doubt, consider having your PD measured professionally by an optician.


 

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