Prescription Glasses
Measuring Your Pupillary
Distance (PD)

What does Pupillary Distance mean?

It’s the distance (in millimeters) between the centers of your pupils.
The measurement is necessary to fix the optical center of the glasses.

How do you
measure Pupillary Distance?

Do it yourself

  • 1 Take or print a millimeter ruler and stand in front of a mirror.
  • 2 Place the ruler on your forehead.
  • 3 Close your right eye and place the ‘0’ of the ruler above the center of your left pupil.
  • 4 Slowly, shut your left eye and open the right eye maintaining the focus of your eyes.
  • 5 Write down what you’ve measured. This is your pupillary distance.

With the help of a friend

  • 1 Look at a distance far away for a better measurement.
  • 2 Have your friend stand by and place the ruler on the forehead and above your eyes.
  • 3 Measure the distance between the center of one pupil to the center of another.
  • 4 Ask your friend to note the value- this is your pupillary distance.
  • 5 To be sure, ask your friend to measure it again standing at the other side.

How to Measure PD for
reading glasses?

If you’re ordering a pair of reading glasses, you’ll have to subtract 3 from the pupillary distance you measured. For example, if your pupillary distance is 62mm; the pupillary distance you enter should be 59 mm. It’s as simple as that.

How to get Perfectly Fitting
Zero-Powered Glasses or Sunglasses

If you have never wore prescription eyeglasses and want to know which of the sizes will fit you. You can easily measure it perfectly using a debit/ATM/credit card. Here’s how:

  • 1Stand in front of a mirror.
  • 2Vertically, place one end of your card at the center of your nose.
  • 3If the other end of your card is in alignment with the edge of your eye, go for a ‘medium’ size.
  • 4If the other end goes beyond the edge of your eye, go for a ‘small’ size.
  • 5If the other end isn’t able to reach the edge of your eye, go for a ‘large’ size.
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