What's PD in your prescription?

PD stands for Pupillary Distance. It is the measurement, in millimeters, between the centers of your two pupils.

How to measure the PD by yourself?

Measure pupillary distance by yourself is quite easy, all you need is a mirror and ruler. By following our 3-step guidance, you can obtain your PD in less than 1 minute.
To achieve the most accurate measurement, it's advisable to take a moment to relax before remeasuring your pupillary distance a few times. In case you obtain different numbers with each measurement, calculate the average value to use as your final measurement. For instance, if you measured your PD five times, sum up all five values and then divide the total by five. This will give you the final or average pupillary distance.

How to Get Your Pupillary distance(PD)？

PD value is part of your prescription, you'll need it to fill the prescription before you shop on sllac.com. If your prescription photo doesn't include it, don't worry. We have a guide below to show you how to measure your PD value in minutes.

What’s the Average PD for Women and Men?

The average adult pupillary distance (PD) value range is typically between 54 and 74 millimeters. The average pupillary distance (PD) for women is approximately 60 mm, while for men, it is around 64 mm. Nevertheless, it's important to note that pupillary distance can vary among individuals.

Why it's important to measure your PD?

Pupillary distance is an essential value in an eyeglass prescription because it helps ensure that the optical centers of the lenses are aligned properly with your pupils.