What is a pupillary distance?

                                       Pupillary distance is the distance in millimeters between the centre of one pupil to the centre of the other. 

It is usually around 62mm but can vary between 54mm and 74mm in adults.  

Why is it necessary?

The pd is necessary to ensure that your are looking out through the optical centre of the lens. 

After your eye exam its a good idea to ask your optician to measure your pd and to write the measurement on your prescription. 

How do i measure my pupillary distance?

The quickest and easiest way to measure your pd is to follow these steps

- Stand approximately eight inches (20cm) away from a mirror.
- Next, hold a ruler up against your nose.
- Then shut your right eye and align the 0 mm mark on the ruler with the centre of your left pupil.
- Next look straight ahead and close your left eye and open your right eye making sure to keep the ruler held steady.
- The millimeter line that is in the centre of the right pupil is your PD.
- You can repeat these steps 3 or 4 times until you get a consistent measurement. 

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