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How to measure your child’s pupillary distance.

A PD stands for pupillary distance which is the distance between your pupulis. This measure is important to define the optical center of your child's glasses.

Sometimes this is on your child's prescription but if not, here's a few
simple ways to measure this at home.

 

1. Download an App

There are several free apps you can download on your phone that can measure a PD accurately. Search the app store for “PD Measure”.

 

2. With Glasses

If your child already wears glasses a simple way to measure the PD is by marking a dot on their glasses with a non-permanent maker, and then measuring the distance between the two.

Step 1:

Position yourself at eye level to your child. With your child looking straight
ahead and their glasses on, cover one of their eyes with your hand and mark a dot on the glasses where their pupil is.

Step 2:

Repeat step one for the opposite eye, ensuring you cover the eye you are not
measuring.

Step 3:

Taking a tape measure or ruler, measure the distance between the dots in
millimetres. This is your child PD.

Step 4:

Repeat these steps a few times to ensure accuracy.

 

3. Without Glasses

An alternate way to measure your child PD is using a ruler ensuring your covering each eye as you align the ruler with the pupil.

Step 1:

Standing at your child’s eye level, rest a ruler across your child’s brow line.

Step 2:

With your child looking straight ahead, line up the 0 with the centre of one of
their pupils.

Step 3:

Record the number in the centre of their other pupil. This is their PD.

Step 4:

Repeat these steps a few times to ensure accuracy.