How to Find Your PD for a GlassesUSA Order

Ordering prescription glasses from GlassesUSA means entering your pupillary distance along with the rest of your prescription. This guide covers what GlassesUSA specifically needs and how to get your number — for the fundamentals of PD and how to measure it, see our complete guide to measuring pupillary distance.

What GlassesUSA needs

GlassesUSA points out that most people effectively have two PD values:

• Far PD — for distance vision, used for single-vision, progressive, and office lenses.
• Near PD — for close range, used for bifocals and reading glasses (about 3 mm less than far PD).

Your two eyes don't have to match, which is why a dual (monocular) PD — two numbers — exists alongside the single one. For multifocal orders in particular, both numbers matter; single PD vs dual PD explains when you need which.

As a rough plausibility check, GlassesUSA cites an adult range of about 55 to 75 mm, and roughly 40 to 53 mm for children. If your reading lands far outside that, measure again. (Published ranges differ from site to site for a real reason — we cover it in why every site gives a different normal PD range.)

Where to get your number

1. Your prescription — eye doctors are supposed to list PD but often don't. Check first.
2. Ask the office that did your exam if it's missing.
3. Measure it at home. GlassesUSA's own guide uses a mirror and millimeter ruler. If you'd rather skip that, our PD measurement tool reads the iris as a fixed-size reference through your camera — no ruler to print, no card to hold — and returns both the single and dual numbers, ready for whichever GlassesUSA's form asks for.

What happens if your GlassesUSA PD is wrong

GlassesUSA covers genuine manufacturing defects, but how it handles a customer PD error isn't clearly published — so it's worth confirming with their support in writing before you order, rather than assuming. We put GlassesUSA side by side with Zenni, Warby Parker and EyeBuyDirect on exactly this question in what each store does if your PD is wrong.

Keep it honest

Home measurement — ruler, card, or camera — is a good estimate, not a clinical reading. For everyday single-vision glasses, being off by a millimeter rarely matters. For progressives, bifocals, or a strong prescription, where it matters more (does your PD need to be exact), measure a few times for consistency and confirm against a professional measurement when you can. A little care here saves a return later.

Sources

• GlassesUSA.com Help Center — What is Pupillary Distance (PD)?
• GlassesUSA.com Help Center — How to measure your PD at home
• GlassesUSA.com Blog — 5 easy tips on how to measure pupillary distance