Category Archives: Prescriptions

What Is Pupillary Distance?

By: Anthony Tangeman

In a previous blog post Michael Walach described how to measure Pupillary Distance, or PD. Now we are here to tell you exactly what P.D. is and why it is important.

You can likely infer what PD means from its name: it is the distance between the centers of the pupils in millimeters. While a simple concept, this measurement is crucial in order to have glasses perfectly suited for your eyes.

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How Do I Read My Child’s Eyeglasses Prescription?

By: Anthony Tangeman

Parents concerned about their child’s eyesight often want to have a better understanding of their child’s eyeglasses prescription.. By learning how to read a prescription, parents can better understand their child’s vision. Understanding a prescription comes down to learning the layout of a prescription and the meaning of each number and character.

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How Do I Measure My Kid’s PD?

BY MICHAEL WALACH

Pupillary Distance, PD for short, is simply the distance between the centers of the eye pupils measured in millimeters. This measurement is used to position the lens in the frame. Most kid’s PDs range between 40mm and 54mm. In order to successfully measure your child’s PD you need two things: a camera and a personal card (ID, credit card, bank card, driver’s license etc.). Any of those cards are usually 3 3/8″ (86mm) wide and it is used to compare it with your kid’s PD.

Here are 6 steps to take this measurement:

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