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Guide to measuring pupillary distance

DNP, or naso-pupillary distance, is a crucial measurement for determining the distance between the pupils and the nose.

It is equally important to measure PD, or pupillary distance, to ensure even greater accuracy.

These are crucial measurements in the production of prescription glasses, because each person has a unique pupillary distance, which makes these measurements essential to ensure that the lenses are personalized according to your pupillary distance, providing clear and accurate vision.

In most ophthalmological consultations, in addition to information about your glasses prescription, the ophthalmologist sometimes performs the measurement and includes the data in the prescription or simply indicates "measure DNP" or "DNP to measure". In the latter case, it is recommended to take the prescription to your trusted optician before choosing the frame.

If your recipe already contains this information, it simplifies the process. You can even order your glasses online, on a website you trust.

There are also some simple ways to estimate your pupillary distance at home:

  • Ruler and Mirror: Hold a centimeter ruler and look at the mirror. Close your left eye and align the tip of the ruler with the pupil of your right eye. Keeping the ruler straight, close your right eye and open your left. The number on the ruler that is aligned with the pupil of your left eye is your pupillary distance .

  • Measurement Apps: There are mobile apps available that use your phone's camera to measure pupillary distance. Just follow the instructions to take the measurement

It is important to note that these methods provide a rough estimate of your pupillary distance. For a 100% accurate measurement, it is recommended to consult a qualified professional at your trusted optician.

Find out how to interpret your recipe in the following article .

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