Pupillary Distance for Your Prescription Glasses

February 1st, 2010 by admin Leave a reply »

Your pupil distance is the distance in millimeters between your pupils (the centers of your eyes). Your adult pupillary distance measurement never changes, and it averages 60 millimeters (mm) for women, and 64 mm for men. Sometimes your eye doctor will write your pupil distance for each eye (for example 33/34, called a monocular pupil distance). Or, the eye doctor may write the pupillary distance measurement as 67/64. This means that your pupil distance for distance vision (or DPD) is 67, and for near vision (or NPD, for reading glasses or multifocal lenses) is 64. Your near vision pupil distance is almost always 3 mm less than your distance vision pupillary distance measurement.

Get your pupil distance from optometrists
The pupil distance is measured with an instrument called a “pupillometer” that is put up to your face. Any optical store employee can measure your pupil distance with this instrument; it is not required to be measured by an eye doctor. Any optical store will have a pupillometer, so eye doctors assume that you will have your pupillary distance measurement taken in the optical store.

Get your pupil distance by yourself
You also can measure yourself with the help of a friend. However, we strongly recommend that you have an eye care professional measure your pupillary distance with a pupillometer. For strong prescriptions, this is a requirement. For weak prescriptions, and for use in our Try On software, here are some instructions for measuring your own pupillary distance. However, if we make lenses based on a faulty pupillary distance measurement, this voids our guarantee of perfect lenses.You need help to measure your pupillary distance.
Ask your friend to do the following:
1. Find a ruler with millimeter measurements, and hold it up to the bridge of your nose.
2. Have your friend close one eye.
3. Your friend should align the ruler’s zero on the left, in the center of your pupil. The pupil is the black spot in the middle of the eye.
4. Without moving the ruler, have the friend move their head to the right and read the millimeter line corresponding to your other pupil.
5. Repeat the process two or three times for accuracy.
6. Record your results.

An accurate pupillary distance measurement is required in order to make prescription glasses. When you get your glasses prescription; you will be able to get glasses lenses at any store you choose.

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