There’s a moment in every brand owner’s journey when the excitement of launching a contact lens line meets the cold reality of supplier selection. You’ve got the branding nailed down, the packaging mocked up, maybe even a Shopify store half-built. Then comes the part nobody talks about enough: figuring out whether the factory on the other side of the world can actually deliver what they’re promising.

I’ve watched too many brand owners skip this step. They find a supplier on Alibaba, the price looks right, the communication feels smooth, and they wire the deposit. Three months later, they’re staring at a container of lenses that don’t match the samples, or worse — lenses that can’t clear customs because the certifications are fake.

This isn’t a hypothetical. It happens more often than you’d think. So let me walk you through the seven due diligence checks we recommend every brand owner run before signing anything.

1. Verify the Manufacturing License — Not Just the Certificate Photo

Here’s what most people do: they ask for a certificate, get a PDF back, check that the company name matches, and move on. That’s not due diligence. That’s a rubber stamp.

What you need to do is cross-reference the license number with the issuing authority’s database. In China, that means checking the National Medical Products Administration (NMPA) registry. For the EU, it’s the EUDAMED database. For the US, it’s the FDA’s establishment registration records.

Why does this matter? Because a certificate can be Photoshopped. A registration number in a government database can’t. We’ve seen cases where a supplier sent a perfectly valid-looking CE certificate that, when checked against EUDAMED, simply didn’t exist. The factory had been operating without authorization for two years.

Action step: Ask for the license number, then independently verify it in the issuing body’s public database. Screenshot the result and save it to your records.

2. Request a Factory Audit Report — Or Commission Your Own

Most established contact lens factories have been audited. ISO 13485 (medical device quality management), BSCI (business social compliance), maybe even a customer-specific audit from a larger brand. Ask for the most recent report.

But here’s the catch: audit reports expire. An ISO 13485 certificate from 2019 tells you very little about how the factory is running in 2026. Check the issue date, the expiry date, and the scope. Some audits cover the entire facility; others cover only a specific production line. If your order involves colored lenses but the audit scope only mentions clear therapeutic lenses, you’ve got a gap.

If the factory can’t produce a recent audit report, that’s not automatically a dealbreaker — especially for smaller factories that haven’t been through the process yet. But it does mean you should consider commissioning a third-party inspection yourself. Firms like SGS, Bureau Veritas, or Intertek can run a day-long factory assessment for a few thousand dollars. Compared to the cost of a ruined product launch, it’s pocket change.

Action step: Request the latest audit report. Check the date, scope, and issuing body. If it’s older than 18 months or doesn’t cover your product category, plan a third-party inspection.

3. Test the Sampling Process Before Committing to Production

This is where a lot of brand owners get impatient. They want to jump straight to pricing and MOQs. But the sampling phase is your single best opportunity to evaluate a supplier’s capability — and their communication.

Pay attention to three things during sampling:

• Speed: How long does it take from brief to sample delivery? A competent factory with existing molds should turn around color-matched samples in 7–14 days. If it takes six weeks, something is wrong with their workflow.
• Accuracy: When you receive the sample, does it match your spec sheet? Check the diameter, base curve, water content, and color pattern under good lighting. Measure it if you have the tools. We’ve seen samples arrive that were 0.3mm off the specified diameter — a difference that sounds tiny but completely changes the fit and appearance on the eye.
• Communication: Did the factory ask clarifying questions? Did they flag anything that seemed off about your specs? A good supplier will push back when something doesn’t add up. A factory that says “yes” to everything without a single question is a factory that hasn’t really read your brief.

Action step: Order samples from at least three suppliers before choosing one. Compare not just the product quality but the entire experience — speed, communication, and attention to detail.

4. Check Their Export History and Target Market Experience

Not all export experience is created equal. A factory that’s been shipping to Southeast Asia for ten years might have zero familiarity with FDA requirements for the US market, or with the specific labeling regulations for Brazil’s ANVISA.

Ask directly: which markets do you currently export to? Can you provide references from brands in my target market? Have you handled the registration process for [your target country] before?

The answers matter because regulatory compliance varies dramatically by region. The EU’s MDR transition has created a lot of confusion — some factories claim CE certification under the old MDD directive, which is no longer valid. The US requires FDA establishment registration and 510(k) clearance for certain lens categories. South Korea has its own MFDS process. If your supplier has never navigated these waters, you’ll be doing it blind.

Action step: Ask for the list of current export markets and at least two references in your target region. Follow up with those references — actually call or email them.

5. Evaluate Their Quality Control Documentation

Every factory will tell you they have quality control. Ask to see the paperwork.

You’re looking for three things:

• Incoming inspection records: How do they check raw materials? The polymer batch, the colorant lot, the saline solution? If they can’t show you incoming inspection logs, they’re trusting their material suppliers on faith.
• In-process quality checks: What happens during production? Are there inline checks at each stage — molding, coloring, hydration, sterilization? How often? What’s the sampling rate?
• Final inspection and AQL levels: What Acceptable Quality Level do they use? For medical devices, AQL 1.0 is standard for critical defects and AQL 2.5 for major defects. If they’re using AQL 4.0, they’re running a much looser operation than the industry expects.

A factory that can pull out QC records from the last three months of production — showing batch numbers, inspection dates, defect rates, and corrective actions — is a factory that takes quality seriously. A factory that shuffles around and says “don’t worry, we check everything” is a factory where you’ll be doing their QC for them.

Action step: Request sample QC records from three recent production runs. Look for specificity — batch numbers, dates, defect counts, and corrective action notes.

6. Understand Their Capacity and Lead Time Reality

Factories love to quote optimistic lead times. “Twenty days” sounds great until you realize it’s twenty days from when they feel like starting, not from when you paid the deposit.

Ask specific questions: What’s your current production queue? How many orders are ahead of mine? What’s your monthly capacity, and what percentage is currently committed? If I need to reorder in six weeks, will there be a slot available?

The answers will tell you whether you’re dealing with a factory that has spare capacity (good for flexibility, potentially concerning for quality) or one that’s running at full tilt (good for confidence in demand, bad for your timeline). Neither is automatically wrong — but you need to know which one you’re dealing with.

Also ask about seasonal bottlenecks. The contact lens industry has predictable peaks: Q3 for back-to-school and holiday prep, Q1 for Chinese New Year disruptions. If you’re planning a September launch and your supplier is already booked through August, you need to know now, not two weeks before your launch date.

Action step: Get a written production schedule with your order confirmation. Include penalty clauses for delays beyond the factory’s control — not to punish them, but to ensure both sides treat timelines seriously.

7. Talk to Their Existing Clients — Especially the Ones Who Left

This is the check almost nobody runs, and it’s the most valuable one on this list.

Ask the factory for references — ideally three current clients and one former client. The current clients will tell you about day-to-day reliability, communication quality, and consistency. The former client will tell you why they left.

If the factory refuses to provide a former client reference, that’s a yellow flag. Not necessarily a dealbreaker, but a signal to dig deeper. Common reasons brands switch suppliers include: inconsistent quality across batches, poor communication during problems, unexpected price increases, and regulatory non-compliance discovered after the fact.

You can also do informal research. Search for the factory’s name on industry forums, LinkedIn groups, and trade show attendee lists. Look for patterns in the feedback. One negative review is noise; three negative reviews from different brands in different markets is a signal.

Action step: Request at least three references. Call them. Ask specific questions about quality consistency, problem resolution, and whether they’d re-sign with this factory today.

The Bottom Line: Due Diligence Isn’t Paranoid — It’s Professional

Some brand owners read a list like this and think it’s overkill. “I just want to find a reliable factory, not interrogate them.” I get it. But here’s the reality: the cost of running these seven checks is a few hundred dollars and a couple of weeks. The cost of skipping them can be a container of non-compliant product, a failed launch, or a recall that destroys your brand before it even gets started.

The best suppliers welcome due diligence. They’re proud of their certifications, their QC processes, and their client list. If a factory gets defensive when you ask for documentation, that’s not a sign of a proud manufacturer — that’s a sign that you’ve found the wrong partner.

Take the time to do this right. Your future brand — and your future customers — will thank you.