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Which standards apply to non-prescription reading glasses?

By Spektrum Glasses Editorial Team · Published 2026-08-11 · Updated 2026-09-11 · Facts re-checked 2026-09-11 How this page is written and checked: our editorial method · how we verify claims

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Short answer

Two standards genuinely apply: ANSI Z80.3 governs a lens’s light transmittance and color fidelity, and ISO/IEC 17025 (verified by accreditors like A2LA) certifies the testing lab that measured it. Neither standard tests reading-power accuracy - no non-prescription reader on the market, including ours, holds an accredited test for that.
  • ANSI Z80.3 tests a lens’s light transmittance and color, not its reading-power accuracy.
  • ISO/IEC 17025 and A2LA accredit the testing lab, not the product itself.
  • A blue-light percentage without its wavelength band is not a checkable number.
  • A single-vision reader has one focal distance; reading and screen distances differ.
  • Ready-made magnifiers, as a class, rarely publish a transmittance or accreditation report to check.

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What ANSI Z80.3 actually covers

ANSI Z80.3 is the US standard for non-prescription sunglass and fashion-eyewear lenses. It specifies test methods and pass/fail limits for light transmittance - how much visible light, UV, and specific wavelength bands pass through the lens - and for chromaticity, meaning how much the lens shifts color perception outside an allowed range. A lens tested to Z80.3 has been measured against both of those axes, sample by sample, by a laboratory. What Z80.3 does not do is test the reading power. It says nothing about whether a lens marked +1.50 diopters actually measures +1.50, how far that reading sits from spec, or whether the two lenses in a pair are matched to each other. That is the axis reading glasses are actually chosen on, and it sits outside Z80.3’s scope entirely. A published Z80.3 pass is a real, checkable claim about light and color on the lens - it is not a magnification-accuracy claim, and no reading-glasses brand should be read as making one just because a Z80.3 report exists.

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Lab accreditation is the second thing to check: ISO/IEC 17025 and A2LA

Two more terms show up on lab reports and are worth knowing apart. ISO/IEC 17025 is the international standard for a testing laboratory’s own competence: its equipment calibration, its methods, its record-keeping. A2LA (the American Association for Laboratory Accreditation) is one of the bodies that audits labs against that standard and issues a certificate number when they pass. Neither one tests the product. They test the lab. That distinction matters because it tells you whose word you are taking: a number from an accredited lab, tied to a certificate you can look up, versus a number with no report behind it at all. When a spec sheet cites a report number and an accreditation certificate, you can ask for both and check that they are real. When it just cites a percentage with nothing behind it, there is nothing to check.

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The checks that work on any brand’s reading glasses

The same checks apply to a reading-glasses spec sheet from any brand, including ours:
  • Does every blue-light or UV percentage state the wavelength band it was measured over? “Blocks 99% of blue light” with no band attached is not a number you can verify against anything.
  • Is there a report number and a named, accredited testing lab behind the transmittance figures, or only a marketing claim?
  • Does the report cover chromaticity - color fidelity - and not just how much light gets through?
  • Is “clear” actually clear on the numbers? A lens can look clear and still filter very little of the blue band; a clear tint is a color, not a spec. Our own clear ZENOX-line lens, for comparison, measures about 52% average across the blue band against 100% UV filtered - clear and near-clear are two different claims, and only a report tells you which one you are buying.
  • Is the reading power (the diopter) itself independently tested, or only printed on the box? For non-prescription readers, the honest answer across the category, ours included, is that magnification is asserted, not standards-tested.

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Our own numbers, run through those checks

PROSPEK’s clear lens has been measured by COLTS Laboratories (report O-SPG111015), an A2LA-accredited lab (certificate 1612.01) accredited to ISO/IEC 17025, with spectral transmittance tested per ANSI Z80.3. The taper is reported by wavelength, not as one blanket figure: 99.99% filtered at 400 nm, 95.1% at 410 nm, 63.0% at 420 nm, and 33.1% at 450 nm. Visible light transmission is 91.6% - a near-clear lens, not a heavy tint - and both UVA and UVB are filtered above 99.99%. The lens also passes ANSI Z80.3 transmittance and chromaticity testing on all samples in the clear-lens group (filter category 0, cosmetic lens). As above: that pass is a light-and-color result. We do not hold, and are not aware of any non-prescription reading-glasses brand that holds, an accredited test of reading-power accuracy - so we do not claim one. The full report is published at kb.spektrumglasses.com/lab-results for anyone who wants to check the numbers directly rather than take our word for them.

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What a single-vision reading lens can and cannot do

A single-vision reading lens - which is what every PROSPEK reader uses - has exactly one focal distance. It brings one distance into focus and leaves everything else uncorrected; that is true of any non-prescription reader, at any strength. Reading distance (a book or phone, roughly 14-16 inches away) and screen distance (a monitor, usually farther) are not the same distance, so a single-vision lens is always a compromise between the two. The practical guidance is to choose the strength for whichever distance the lens will spend more time at, rather than trying to split the difference. None of this corrects astigmatism, which needs a lens ground to an individual prescription. Non-prescription reading glasses, at any strength, are not a substitute for an eye exam - they add magnification to an otherwise flat lens and nothing more. Reading strengths in the PROSPEK line run +0.50 to +3.00; the widest style offers nine strengths, and some frames are also sold with no magnification at all for people who want the lens tint without added power.

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Reading glasses versus ready-made magnifiers

The standards and checks above apply to reading glasses as a product. They do not apply to ready-made magnifiers - the pre-set, single-strength lenses sold as a product class distinct from reading glasses - because that product class is not typically built around a lens report in the first place. A ready-made magnifier is usually a molded lens blank in a fixed strength, without a published transmittance curve, without a named accredited lab, and without chromaticity data to check. That is the actual comparison worth making, and it is a comparison of product classes, not of any specific seller or price point: a reading lens that comes with a report you can check, against a magnifier that does not have one to offer. If a product publishes wavelength-specific transmittance numbers, an accredited lab, and a report number, run it through the checks above. If it does not publish any of that, the absence is itself the answer.

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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.

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