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What is ANSI Z80.3 and what does it certify about a lens?

By Spektrum Glasses Editorial Team · Published 2026-08-04 · Updated 2026-08-04 · Facts re-checked 2026-08-04 How this page is written and checked: our editorial method · how we verify claims

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Short answer

ANSI Z80.3 is the American National Standard for non-prescription sunglasses and fashion eyewear. It sets test methods and limits for luminous and ultraviolet transmittance, traffic signal recognition, optical quality, impact and labeling. It says nothing about how much light a lens filters between 400 and 500 nanometers, the blue band.
  • Z80.3 covers non-prescription sunwear: visible and UV transmittance, traffic signal recognition, optical quality, labeling.
  • It sets no requirement for the 400-500 nm blue band; a compliant lens may filter almost none of it.
  • “Tested per ANSI Z80.3” names a measurement method, not a pass mark for blue light.
  • ANSI issues no certificate. Lab credibility comes from ISO/IEC 17025 accreditation, granted by bodies such as A2LA.
  • Any filtering percentage quoted without a wavelength band is unverifiable. Ask for the band and the report.

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What ANSI Z80.3 actually covers

ANSI Z80.3 is an American National Standard for non-prescription sunglasses and fashion eyewear. It is a specification document: it defines how a lens is measured and what limits it must meet to be described as compliant. The scope is narrower than most shoppers assume, and understanding the boundary is the whole point of this page. Broadly, the standard addresses:
  • Luminous (visible) transmittance - what fraction of visible light passes through, measured against a defined photopic weighting. This is the number that tells you how dark a lens really is, independent of how dark it looks in a product photo.
  • Ultraviolet transmittance - limits on UVA and UVB, expressed in relation to the lens category rather than as one universal number.
  • Traffic signal recognition - whether red, yellow and green signals remain distinguishable through the tint. Lenses that fail must be labeled as not suitable for driving.
  • Optical quality - refractive power, prismatic imbalance and haze, so the lens does not distort what you are looking at.
  • Impact resistance and labeling - a drop-ball style test and the wording that must appear on the product.
The standard also groups lenses by darkness, historically into cosmetic, general purpose and special purpose classes, with the UV limits attached to each class. Exact cut-points have shifted between editions, so read the edition named on the report in front of you rather than a number someone remembered from an older version. The full text is a paid document, which is part of why vendors can gesture at it without much fear of being checked.

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What Z80.3 does not tell you about blue light

There is no blue-light requirement in ANSI Z80.3. The standard’s optical thresholds concern ultraviolet light, overall darkness and signal recognition. The band that blue-light marketing is about, roughly 400 to 500 nm, sits inside the visible range and is not subject to any minimum attenuation. The practical consequence: a lens can be fully Z80.3 compliant and filter essentially nothing between 400 and 500 nm. Compliance and blue-light filtering are independent variables. A brand that answers “is it certified” with “yes, ANSI Z80.3” has answered a different question than the one you asked. A second consequence is physical rather than regulatory. Much of the 400-500 nm band is visible blue. A lens that removed all of it would not look clear; it would look amber or orange, because you have subtracted the blue end of the spectrum from everything you see. Our own measurements make the trade-off concrete. Our ZENOX clear lens averages about 52 percent filtration across the blue band while filtering 100 percent of UV. Our amber evening lens reaches 97.9 percent across 400-500 nm - and it is unmistakably amber. Any near-clear lens advertised as removing the whole blue band is describing something that cannot be near-clear.

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”Tested to ANSI Z80.3” is a method, not a certificate

ANSI does not test lenses, does not issue certificates and does not maintain a registry of approved eyewear. There is no ANSI seal to earn. When a lab reports spectral transmittance “per ANSI Z80.3,” it is telling you which measurement procedure it followed - the wavelength steps, the weighting, the geometry - not that a governing body reviewed and endorsed the product. What carries weight is who did the measuring and under what accreditation. ISO/IEC 17025 is the international standard for the competence of testing laboratories, and an accreditor such as A2LA audits a lab against it and issues a certificate number. That number, not the name of a test method, is what makes a report checkable by a third party. Our clear lens data comes from COLTS Laboratories report O-SPG111015. COLTS is A2LA-accredited to ISO/IEC 17025 under certificate 1612.01, and the spectral transmittance was run per ANSI Z80.3. Both halves matter: the standard names the method, the accreditation tells you the method was executed by a lab that gets audited. A vendor should be able to give you a report number, a lab name and an accreditation reference. If any of the three is missing, you are being asked to take the number on faith.

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The arithmetic that makes percentages misleading

Most misleading blue-light claims are not fabricated. They are real measurements quoted without the band, which lets the vendor pick whichever wavelength flatters the product. Our own clear lens shows exactly how much room that leaves. Every one of those figures is accurate and they came from the same lens on the same report. “Filters 99.99 percent of blue light” would be a defensible sentence built on the 400 nm row alone - and it would give you a completely wrong picture of what happens at 450 nm, where the lens is filtering about a third. The honest way to write it is with the wavelength attached to every number, which is why our published data reads “99.99 percent at 400 nm, 33.1 percent at 450 nm” rather than one headline figure. Two more numeracy habits worth keeping. First, a single-wavelength peak and a band average are different quantities; averaged across 400-500 nm, a near-clear lens lands far below its 400 nm peak. Second, some published figures use a hazard-weighted metric rather than a flat average, which changes the result again. Leung, Li and Kee (PLOS ONE, 2017) measured commercially available blue-light-filtering lenses and found they reduced the calculated blue-light hazard by roughly 10 to 24 percent. That is not in conflict with a 99.99 percent figure at 400 nm - it is a different calculation over a different range, and knowing which one you are reading is the entire skill.

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Tint category, driving and the visible-light trade-off

Because Z80.3 does regulate darkness and signal recognition, its categories are genuinely useful for one decision: whether a lens belongs behind the wheel. Our clear lens measures 91.6 percent visible (photopic) transmission, meaning it removes about 8.4 percent of visible light. That sits in the lightest end of the scale and does not meaningfully change how traffic signals read. At the other end, our orange lens filters 99.96 percent across 380-500 nm and our red lens 99.83 percent across the same range, both measured in 2026 by our lens manufacturer’s optical laboratory. Neither is suitable for driving, and we label them that way. That is not a caveat bolted on for legal cover - it is the direct consequence of the physics. Removing nearly the whole 380-500 nm band removes the light that makes a green signal read as green. The amber evening lens sits between: over 98 percent of the blue band, 97.9 percent across 400-500 nm, 99.9 percent of HEV and 98.3 percent across 460-480 nm. It is a heavily tinted lens and it looks like one. The general rule is that blue filtering and neutral color rendering trade against each other. Any vendor claiming both at full strength in one lens is claiming something the transmittance curve will not support. Ask to see the curve.

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What to ask any vendor, including us

This standard is easy to name and hard to check, which is why it shows up in copy so often. Five questions close the gap, and they work on any brand.
  • Over what band was that percentage measured? A figure without a wavelength range is not a measurement you can verify or compare.
  • Is it a peak, a band average, or a hazard-weighted number? All three are legitimate; they are not interchangeable, and the difference can be tens of percentage points.
  • Which lab, which report number, and is it ISO/IEC 17025 accredited? “Tested to ANSI Z80.3” alone identifies a method, not a result.
  • What is the visible transmittance? This tells you the real tint, and it constrains how much blue the lens can plausibly filter.
  • Is the lens rated for driving? A lens that filters most of 400-500 nm is not, regardless of what else is claimed for it.
A vendor who cannot answer these does not necessarily have a bad lens. But they have not given you a way to tell. Our measured data is published at https://kb.spektrumglasses.com/lab-results with the lab, report number and band for every figure, so the same five questions can be run against us.

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Where these numbers come from

Every measured figure quoted here is transcribed from a third-party laboratory report, published in full with the wavelength band and the report number: lab results. Our rule for what may appear on this page at all is on how we choose what to publish.