Help Topics Main » Pupillary Distance (PD) Help » Additional PD questions
What is a PD?
Your Pupillary Distance, or PD, is the distance between the centers of your pupils in millimeters (mm). This measurement is necessary to ensure the correct positioning of your lenses within the frame you have chosen.
Can I give you my PD in inches?
Generally, it is best to measure PD in millimeters. You may click here to print out an easy to use millimeter ruler. If you need to use inches, you have two choices:
First you can take the number in inches and multiply it by 25.4 (for example, 2 ¼ inches multiplied by 25.4 is equal to 57 mm).
The other option is to choose 20 as the PD in the pull down, then click the “Add comments about your prescription” link and type the number in inches in the text box. Our staff will be happy to make the proper conversion for you.
Warranty type will be determined by the date of contact. All Refunds/Credits will be issued on date of receipt. Returned items must be in original condition in the hard case you received from us. However you may keep any accessories as our free gift.
What's Your Return Policy?
At 39dollarglasses.com, we offer a 100% Worry-Free Guarantee!
Our objective is simple: to make sure every customer has a wonderful experience purchasing from us. If you are unhappy for ANY REASON, you may return your eyeglasses for a one-time exchange at no cost or a full store credit for up to 90 days after delivery! We even provide FREE return shipping!
Alternatively, you may request a full refund* on your original order if you contact us within 30 days after delivery; shipping charges are non-refundable. (*There are limitations regarding multifocal lenses (progressives and bifocals) and contact lenses. See below for details.
EFFECTIVE DATE: 1/23/17