How to spot fake sunglasses: the seven checks that actually work

Counterfeit sunglasses are built to pass a glance, not an inspection. The money goes into what a buyer sees in a photograph — the logo, the silhouette, the case — and comes out of what nobody can see, which is the lens. That is the part your eyes actually depend on.

So there are two different questions here, and it is worth keeping them apart. Is this the brand it claims to be? is answered by the seven checks below. Is this safe to wear? is answered by one test, and only one.

1. The printing

Start here, because it catches more fakes than everything else combined.

Genuine manufacturers print and etch to tight tolerances. Counterfeits are usually caught by the text: slightly blurred edges, uneven letter spacing, the wrong weight of font, a logo that sits a millimetre off centre, or printing that smudges under a thumbnail.

Look at the inside of both arms, the bridge, and any text on the lens. Compare it to images on the brand's own site rather than to a marketplace listing, which may itself be a counterfeit's photograph.

Hold it in good light and use your phone camera to zoom in. The magnification reveals printing flaws the naked eye forgives.

2. The measurement markings

Genuine frames carry the size code — something like 60-15-145, meaning lens width, bridge width and temple length in millimetres. Our measurements guide explains what each number means.

What to check: the numbers are present, crisply applied, and plausible. A frame whose markings say 60mm but whose lenses measure 54mm is not what it claims to be.

Many genuine frames also carry a model number, a colour code, a country of origin and a CE or UKCA mark. Missing markings are a strong signal; present-but-sloppy markings are a stronger one.

3. The lens quality

A test you can do in thirty seconds and the one that correlates best with actual optical quality.

Hold the sunglasses at arm's length and look through them at a straight horizontal line — a windowsill, a door frame, a shelf edge. Move them slowly side to side across your field of view.

The line should stay straight. If it bows, ripples or steps, the lens has optical distortion. Genuine lenses from a reputable maker are ground or moulded to a tolerance that keeps lines straight; cheap copies are not.

Distortion is not just a quality marker. It causes real eye strain, which is one of the mechanisms in our piece on whether polarized lenses cause eye strain.

Also check: both lenses the same tint. Hold them against a white background. Counterfeits frequently have a visible mismatch, which standards for genuine eyewear do not permit.

4. The hinges

Underrated and hard to fake cheaply.

A genuine hinge moves smoothly with consistent resistance through its travel and stays where you put it. Open the arm halfway and let go — it should hold.

Counterfeits are usually either loose (the arm flops) or gritty (you can feel the metal binding). Spring hinges on fakes often feel weak or uneven between the two sides.

Open and close each arm several times. The two sides should feel identical. They frequently do not.

5. The weight and the material

Pick the pair up with your eyes closed.

Genuine acetate has a particular density and a slightly warm feel. Injection-moulded plastic imitating acetate feels lighter and more hollow, and often has a visible mould seam along the inside of the arm or around the rim.

Metal frames: genuine ones are usually monel, titanium or stainless. Counterfeits often use a plated base metal that feels lighter, and the plating wears through at the contact points within weeks. Our frame materials guide covers what each feels like.

A mould seam you can catch with a fingernail is not conclusive on its own — some genuine budget frames have them — but combined with anything else on this list it is damning.

6. The case, the cloth and the paperwork

Counterfeiters do produce cases, because a bare pair looks suspicious. They produce them cheaply.

Check the stitching on a fabric or leather case for uneven spacing and loose threads. Check the cloth — genuine microfibre has a consistent, dense nap; cheap substitutes feel thin and shiny.

Check the documentation. Genuine eyewear usually ships with a card or booklet carrying the UV statement, the standards marking and care instructions. A pair with no paperwork at all is not proof of anything, but a pair with badly printed paperwork is.

7. The price and the seller

The least technical check and statistically the most useful.

A deep discount on a current model from an unauthorised seller is the single strongest predictor of a counterfeit. Genuine stock is not dumped at 80% off outside clearance of discontinued lines.

Buy from the brand, an authorised stockist, or an optician. On marketplaces, the risk is real regardless of reviews, because listings are hijacked and reviews are transferable between products.

The only check that matters for your eyes

Everything above answers "is this the brand it claims to be?". None of it answers "is this safe?"

Those are genuinely different questions. A no-name pair with honest UV400 marking from a reputable budget maker protects your eyes perfectly well. A convincing counterfeit of a premium brand may not protect them at all.

And the harm is not neutral. A dark lens without a UV filter is worse than no sunglasses, because the darkness opens your pupil and then lets ultraviolet through a wider aperture. We set that out in full in UV protection vs dark lenses.

The reliable test is a photometer, and most opticians have one. They will measure the UV transmission of your lenses in seconds, usually free, usually without an appointment. If you have any doubt about a pair — counterfeit, inherited, unmarked, bought abroad — that is the answer.

What does not work: phone-screen tests, torch tests and UV pens. They produce confident-looking results that mean very little.

The one home test that is reliable tells you about polarization rather than UV, and we cover it in how to tell if sunglasses are polarized.

What about "replica" and "inspired by"?

A legal distinction worth knowing. A frame that copies a shape without the trademark is not counterfeit — design patents expire, and classic silhouettes are widely made by many manufacturers. A frame carrying someone else's trademark without authorisation is.

The practical consequence: an unbranded frame in a familiar shape, honestly marked and honestly priced, is a legitimate product. Judge it on the lens, the hinges and the markings like anything else. Our piece on whether cheap sunglasses are bad for your eyes covers what price actually buys.

If you already bought a fake

Three steps, in order.

Stop wearing them in bright sun until the lens is tested. That is the part that matters.

Get the UV transmission measured at an optician.

Report and claim. Most marketplaces and card providers have counterfeit-specific processes, and photographs of the markings help. Brands also have reporting channels, and they act on them.

Where fakes come from, and why that helps you spot them

Counterfeits are made to a price, and the price dictates which corners get cut. Knowing the order they get cut in tells you where to look.

The packaging is cheapest to copy well, so it is usually the most convincing part. A perfect box means nothing.

Printing and logos are next, and modern fakes get these close. Slight softness in fine text, inconsistent spacing, or a logo at marginally the wrong size are what remain.

Hinges are expensive to make properly, so they are the reliable tell. A real hinge moves with even resistance through its whole travel and holds where you leave it. A fake's hinge is loose, gritty, or stiff then sudden.

Lenses are the most expensive part to get right, which is why they are where fakes fail hardest — and why the optical test matters more than any cosmetic inspection.

The UV claim costs nothing to print. This is the part that matters for your eyes and the part a counterfeiter has no incentive to deliver.

Why a fake is worse than no sunglasses

Worth being explicit about, because it is not intuitive.

A dark lens with no UV filter dilates your pupil while admitting ultraviolet. Without sunglasses, bright light constricts the pupil and you squint, both of which reduce exposure. The fake removes those defences and keeps the hazard.

That is the whole argument for caring about this. A cheap pair that genuinely blocks UV is fine. A convincing pair that does not is actively worse than squinting.

Frequently asked questions

The short version

Printing, markings, lens distortion, hinges, material, case, seller. Seven checks, two minutes, and they will catch nearly every counterfeit.

But remember what they do and do not answer. They identify a fake brand. Only a photometer at an optician identifies an unsafe lens — and that is the question your eyes actually care about.