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How to Measure Pupillary Distance?

Pupillary Distance measures the distance between the centers of your pupils. Normally the optician will measure your PD on your prescription. For average adult, PD is between 54mm - 74mm. For kids, it will be 43 - 58mm. Pupillary distance should be offered for most accuracy of the prescription lens made. You can also measure PD yourself.

1st Way: Measure Yourself

5 Steps

Step 1

Stand in 8in. Away from the mirro

Step 2

With your face straight, hold the ruler against your brow

Step 5

Read the mm line that lines up with the center of your right pupil. This number is your PD.

Step 3

Close your right eye and aligh the ruler's zero to the center of your left pupil.

Step 4

While look straight, close your left eye and open your right eye.

2nd Way: Have a Friend to Measure for you

2 Steps

Step 1

Keep both eyes open


  • Have them crouch/sit while you stand so they are out of your field of vision
  • Keep your eyes as still as possible.
  • Look above his/her head at something approximately 10-20 ft. away.
  • Do not look at the person measuring!

Step 2

Have your friend put the zero on the millimeter ruler over the center of one pupil, then measure the distance to the center of the other pupil.

Calculate Near PD For Reading Glasses

1. You can calculate Near PD for reading glasses by subtracting 3mm from your distance PD. For example, if your distance PD is 63mm, then your near PD is 60mm.

2. If you are using Dual PD to calculate near PD, then subtract 1.5mm from each eye’s measurement. For example, if your dual PD is 33/31mm then your near PD would be 31.5/29.5mm.