<div class="_help_font_site selected-art-author"> <p><strong>What is PD?</strong></p> <p>PD stands for Pupillary Distance, which is the distance between your pupils in millimeters. PD is very important for accurately fitting your lenses to achieve visual acuity.</p> <p>Generally, PD numbers do not change for adults. The average PD range for adults is 55-75 mm and for kids is about 42-55 mm. A difference of 2-3 mm is acceptable.</p> <p>&nbsp;</p> <p><strong>How to measure PD?</strong></p> <p><iframe frameborder="0" height="300" scrolling="no" src="https://www.youtube.com/embed/n5UQdbjmI6E" width="500"></iframe></p> <p>We highly recommend checking your PD with your doctor, especially for bifocal or progressive lenses.&nbsp;</p> <p>You can also measure the PD by yourself.</p> <p><strong>Download a printable PD ruler and check how to measure the PD <a href="https://df5apg8r0m634.cloudfront.net/email/2020/0513/3XpWH2MXzao4yhiX.pdf">HERE</a>.&nbsp;</strong></p> <p>&nbsp;</p> <p><strong>How to read PD?</strong></p> <div id="intact_31"> <p>Your PD may be written in three ways:<br /> 1. PD (OU), written as &quot;64&quot;, means the Binocular PD which is for both eyes.</p> <p><img alt="" src="https://df5apg8r0m634.cloudfront.net/images/2019/0322/fBdfyaqAZu.jpg" /></p> <p>2. PD (OD), means the Monocular PD for the right eye. PD (OS), means the Monocular PD for the left eye.<br /> A Monocular PD is written as two numbers, for example, &quot;32/32&quot;, the first one &quot;32&quot; represents the PD for the right eye, and the second one &quot;32&quot; represents the PD for the left eye.&nbsp;</p> <p><img alt="" src="https://df5apg8r0m634.cloudfront.net/images/2019/0322/iHqmaWSh5P.jpg" /></p> <p>3. Sometimes PD is written with two different numbers, for example, &quot;62/59&quot;, or they are labelled &quot;Far&quot; and &quot;Near&quot;. Your PD is usually measured for distance vision, which is &#39;Far PD&quot;, or &quot;62&quot; in this example. For reading glasses, doctors measure your &quot;Near PD&quot; or &quot;59&quot; in the above example.<br /> Always enter your &quot;Far PD&quot; for distance vision eyeglasses and enter your &#39;Near PD&quot; for your reading glasses only. For most people, the difference between Far PD and Near PD is about 2-3mm.<br /> <br /> <strong>How to fill in PD?</strong><br /> <br /> 1. If you only have one PD number, such as &quot;64&quot;, please select 64&nbsp;when fill in your prescription.&nbsp;<br /> <img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2020/0427/xopny3Yq0Qt8dc38.png" style="height:400px; width:600px" /><br /> <br /> 2. If you have two numbers in your prescription, such as &quot;32/32&quot;, please click &quot;Two PD numbers?&quot; and fill in 32/32.<br /> <img alt="" src="https://df5apg8r0m634.cloudfront.net/email/2020/0427/eVuYP9WMFz4wGCiL.png" style="height:400px; width:600px" /><br /> <br /> 3. If your PD is written as &quot;62/59&quot;, then &quot;62&quot; is your far&nbsp;PD and &quot;59&quot; is your near PD. Please enter your &quot;Far PD&quot; for distance vision eyeglasses and enter your &#39;Near PD&quot; for your reading glasses only.</p> </div> </div>