Who this checklist is for

I've handled B2B eyewear sourcing orders for 8 years. I've personally made (and documented) five significant mistakes, totaling roughly $11,400 in wasted budget. Now I maintain our team's pre-order checklist to keep others from stepping on the same rake.

This checklist is for anyone placing a first or repeat order for progressive glasses—lenses and frames, prescription or non-prescription, standard or rimless. It won't help you negotiate price. It will help you avoid the six mistakes that cost us real money between 2019 and 2024.

Total: six steps, plus a short list of failure modes at the end. You can run through all of them in about 45 minutes on a fresh order.

Step 1: Lock the prescription type and lens spec before anyone quotes

It's tempting to think progressive lenses are a single product. But "progressive" describes a lens design category, not a spec sheet. The same order can be quoted three ways and you'd only catch the difference after delivery (unfortunately).

Before you email a single supplier, write down the prescription type (Rx vs. non-Rx, since prescription progressive glasses and non prescription progressive glasses often run through different production lines), the lens material (CR-39, polycarbonate, 1.60, or 1.67 high-index—each has a different edge thickness at the same Rx), the anti-reflective and hard-coat baseline ("standard coating" means different things at different labs), and the PD plus fitting height. If you're supplying finished glasses, you need both. For non-Rx progressives, fitting height still matters because the corridor is fixed.

I'm not 100% sure every lab uses the same corridor definition—because they don't. Which is the next step.

Step 2: Confirm frame-lens compatibility, especially for rimless

Rimless progressive glasses for women are the most common source of our rework. Why: there is no frame rim to cover the lens edge, so the edge cut, thickness, and drill position are fully visible to your customer. That's the entire product.

In September 2022, I approved a 120-pair order of rimless progressive glasses for women without checking the lens edge thickness spec against the frame's hinge mounting. It looked fine in the digital mockup. The shipment arrived with 2.0mm edges that chipped during hinge mounting—34 pairs went straight to scrap. That was $2,900 plus a three-week delay.

What to check at this step: the minimum edge thickness the frame manufacturer requires (often 1.6–2.0mm, but the spec is per frame, not per lens), the drill hole position and diameter, whether the lab has an actual drill template for that frame, and how the lens material will behave at the drill point (polycarbonate drills differently than CR-39, e.g.).

To be fair, a lab can't always source the exact frame you're pairing with a lens. Which is why I now send frame samples with the lens order, not after, so the lab measures the actual mount.

Step 3: Demand real lens specs, not renderings

Digital mockups lie. They always look crisp, always show the corridor cleanly, always have thin edges. What you want is a spec sheet, in writing, that includes the design type (freeform digital vs. traditional molded progressive), the corridor length (typically 10–14mm short, 14–18mm standard, 18mm+ long), the minimum fitting height (meaning the vertical distance from the pupil to the bottom of the lens), and the tolerances the lab works to. ANSI Z80.1 is the common U.S. baseline for prescription ophthalmic lens tolerances; ISO 8980-2 covers progressive lens tolerances internationally. Ask which one the lab works to, and request the actual measurement range from the last production run.

The "just ask for their standard spec" advice ignores that "standard" is vendor-defined. Some labs publish tolerances; most, in my experience, don't unless you press them.

Step 4: Verify progressive corridor capability before bulk

I went back and forth between the domestic lab and the overseas supplier for three weeks. Domestic offered 10-day turnaround and easier rework; overseas offered roughly 30% savings. Ultimately chose overseas because the volume justified it—but I shipped a 5-pair test batch first, and that decision did more to protect the order than any price negotiation.

The test batch told me the overseas lab's corridor was shorter than what the domestic lab delivered on the same Rx. Not "wrong," just different. If I hadn't checked, 200 pairs would have arrived with a fitting height mismatch against the frame. On the test batch itself, confirm three things: the fitting height used in production matches your spec (not the lab's default), the corridor length is written on the job ticket (not just implied by "standard"), and prism thinning is either included or quoted separately for higher-Rx work. That third one is where quotes quietly diverge (ugh, again).

I'm not 100% sure the corridor mismatch was the lab's issue or the frame's, to be honest. But the test batch caught it before bulk, which is the point.

Step 5: Check coating and edge finishing on a sample, not a promise

This is the step most buyers skip, especially first-timers. Coating and edge finishing are the first things your customer actually sees—and in rimless styles, the only thing they see.

Looking back, I should have paid for a physical sample of the exact frame-and-lens combination before the first 120-pair order. At the time, the digital mockup and the lab's sample photo seemed enough. They weren't. On a sample, hold the lens edge against a light source (cloudy edges on a rimless lens read as "cheap" instantly, regardless of the lens inside), check the AR coating tint and adhesion (a faint green or blue cast is normal; a visible oil-slick look usually means a lower-grade coating stack), and do a light thumbnail drag on an inconspicuous part of the edge. If it marks, the hard coat is thin.

Quality here isn't cosmetic. When your customer hands the glasses to their end client, the edge finish and coating clarity are the first signals of whether the product is worth what they paid. The lens inside can be excellent—if the visible parts look weak, the perception follows, and that's the part that gets remembered.

Step 6: Write inspection criteria into the PO before bulk

The order confirmation isn't the place to clarify quality. It's the place to lock it. Before you sign or pay a deposit, add the AQL (acceptable quality limit) level and sample size—AQL 2.5 with a single sampling plan is a common starting point—plus specific visual criteria for edge polish, coating uniformity, frame alignment, hinge function, and lens-to-frame gap in rimless styles.

Attach photographic examples of acceptable vs. rejectable on the two most subjective items (edge polish and coating tint), and add the consequence clause: rework, credit, or replacement, and on what timeline. One supplier told us their lenses were "functionally identical" to a major branded lens. Per FTC advertising guidelines (ftc.gov), claims like that need substantiation, and "functionally identical" is a claim, not a category. We asked for the comparative test data. They didn't have it.

What this step does: it moves the argument from "we think this is second-rate" to "here is the spec you agreed to." In our experience, that alone cut rework disputes by roughly half. Don't hold me to the exact figure—I'm going from memory of our Q3 2023 numbers.

What I'd do differently, and the six failure modes to watch

If I could redo the 2019–2022 period, I'd add a $40 sample step to every order before bulk. Every single one. The cost is trivial next to a 34-pair scrap.

The six failure modes I've seen most often (and mostly caused):

  1. Quoting from an Rx alone—ignoring frame, PD, fitting height, and edge thickness spec.
  2. Trusting a rendering—mistaking a digital mockup for the finished product.
  3. Skipping the test batch—going from quote to 200-pair bulk without a physical sample.
  4. Not writing specs into the PO—leaving "standard quality" open to interpretation.
  5. Buying on unit price—the per-unit difference usually gets eaten by rework and delay. Granted, this depends on volume; at 500+ pairs, price negotiation matters more than at 50.
  6. Forgetting the non-Rx category—non prescription progressive glasses still need optical center and fitting height checks; "no prescription" doesn't mean "no spec."

None of this is exotic. It's just a checklist. But every item on it exists because we paid for the lesson in dollars and lead time.