- Stand in front of a friend or family member at a distance of just under arms length
- Look directly over their shoulder into the distance.
- Allow them to place a ruler on the bridge of your nose.
- They then need to read off the number of millimetres between one pupil and the other.
A second alternative is to measure from the pupil to the bridge of the nose. Then multiply this number by 2..
This measurement is your pupilliary distance measurement