<div class="_help_font_site selected-art-author"> <p><strong>How to measure PD?</strong></p> <p>PD(pupillary distance) is very important for accurately fitting your lenses to achieve vision acuity. Generally speaking,&nbsp;the PD number for adults stays the same. Average PD for adults is 55-70 mm. For kids, it&#39;s&nbsp;about 50-70 mm. A difference of 2-3 mm is allowable.</p> <p>We highly recommend checking with your doctor. You can also measure it this way.</p> <div id="intact_31"> <div class="HelpContent"> <p style="margin-left:0pt; margin-right:0pt; text-align:justify">Step 1. Stand about 25cm away from a mirror. Hold the ruler over your eyes.</p> <p>Step 2. Close your right eye and use your left eye to look straight at the mirror. Keep the ruler&#39;s &quot;0&quot; measurement exactly in line with the center of your left pupil.&nbsp;</p> <p>Step 3. Close your left eye and open your right eye while looking straight. And the number right directly over your right pupil is your PD.</p> <p>Step 4. Repeat this a few times to make it is accurate.</p> <p>&nbsp;</p> <p><strong>Tips:</strong></p> <p>1. For bifocal or progressive lenses, we strongly recommend you get this information from your optician to ensure accuracy.</p> <p>2. The&nbsp;average PD for adults is 55-70 mm. If your DIY PD number&nbsp;is out of this range, be sure to confirm with your optician.&nbsp;</p> <p>&nbsp;</p> </div> </div> <div id="intact_31"> <p><img src="http://img.firmoo.com/images/2017/0123/vVDl15KDe5.png" /></p> </div> <div id="intact_31"> </div> </div>
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