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ISO 8980-3:2022/Amd 1:2026 Ophthalmic optics — Uncut finished spectacle lenses — Part 3: Transmittance specifications and test methods
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EN ISO 8980-3:2022/A1:2026 is a CEN amendment to EN ISO 8980-3:2022 for ophthalmic optics. It updates the transmittance specifications and test methods for uncut, unmounted finished spectacle lenses, with added detail for claimed wavelength cut and how that claim is checked and reported. Manufacturers, test laboratories, and buyers use it when transmittance performance needs to be stated and verified in a consistent way.
What does EN ISO 8980-3:2022/A1:2026 specify?
EN ISO 8980-3:2022/A1:2026 modifies the European Standard EN ISO 8980-3:2022 for uncut finished spectacle lenses. Its focus is the transmittance properties of lenses, including attenuation of solar radiation, and the way those properties are claimed, measured, and declared.
The amendment changes the scope wording, adds a new defined term, introduces a new requirement for claimed wavelength cut, updates measurement uncertainty rules and instrument conditions, revises the information supplied by the manufacturer or supplier, and adds informative Annex G.
What are the key requirements of EN ISO 8980-3:2022/A1:2026?
EN ISO 8980-3:2022/A1:2026 mainly tightens how wavelength cut claims are made and verified, and it gives more specific measurement conditions. For a reader, the practical effect is that a claim is not just a label - it needs supporting measurement under defined conditions.
Claimed wavelength cut
Clause 6.7 says that when a lens is claimed to have a specific wavelength cut, the claim has to meet the stated requirement for the nominated wavelength. In practice, this means the supplier needs measured spectral transmittance data that support the advertised cut-off value.
For such lenses, the spectral transmittance measured according to 7.2 must be below 5.0% at the nominated wavelength, and below 1.0% for all wavelengths from 280 nm up to 10 nm shorter than that wavelength. After ultraviolet irradiation as specified in 7.7, the claimed performance still has to be satisfied. That matters because the claim must remain valid after a durability-type exposure.
Measurement uncertainty
Clause 7.2.1 replaces the uncertainty limits for spectral transmittance measurements. The amendment sets separate limits above 20%, in the range from 20% down to 5%, and below 5%, all at a 95% confidence level. In practice, labs need to check that their method and instrument can meet these uncertainty levels before using the results for claims or acceptance.
Test method for wavelength cut claims
Clause 7.2.2 requires a spectrophotometer or equivalent device capable of spectral transmittance measurement with relative uncertainty at or below 10% and wavelength uncertainty within ±1.0 nm. The spectral resolution must not exceed 1 nm, the instrument must operate from 280 nm to 780 nm, and the spectral bandwidth must not exceed 2 nm FWHM. This is what keeps results comparable between instruments and avoids over-reading a lens cutoff.
The lens used for the measurement is a plano lens of 2 mm thickness, unless another thickness is stated. The measurement is made at the reference point with the beam normal to the front surface. For a test lab, this fixes the sample setup and reduces variation caused by geometry.
Information supplied with the lens
Clause 8 broadens how required information may be supplied. The manufacturer or supplier may provide it on the package, in an accompanying document, or in other separate information, including digital forms such as a QR code or data matrix code. The declared information now includes claimed absorption or transmittance properties in accordance with 6.6 and/or 6.7.
Annex G
Annex G gives background on why lens geometry and spectrophotometer configuration affect wavelength cut results. It explains, in practical terms, why the specified thickness, wavelength range, and instrument characteristics are needed for fair comparison.
What terms does EN ISO 8980-3:2022/A1:2026 define?
Wavelength cut - the lowest wavelength at which the spectral transmittance rises to a specified level.
Spectral transmittance - the amount of light transmitted at each wavelength, which is the basis for the wavelength cut claim.
Visual attenuation coefficient - the calculated measure referenced in Clause 7.3 for describing how the lens reduces visible light.
FWHM (full width at half maximum) - the spectrophotometer bandwidth limit used to control the sharpness of the measurement.
UV (ultraviolet) irradiation - the exposure used in the verification step to check that the wavelength cut claim remains valid.
Plano lens - a lens used in the measurement setup with no optical power, here specified at 2 mm thickness unless otherwise stated.
EN ISO 8980-3:2022/A1:2026 is a CEN amendment to EN ISO 8980-3:2022 for ophthalmic optics. It updates the transmittance specifications and test methods for uncut, unmounted finished spectacle lenses, with added detail for claimed wavelength cut and how that claim is checked and reported. Manufacturers, test laboratories, and buyers use it when transmittance performance needs to be stated and verified in a consistent way.
What does EN ISO 8980-3:2022/A1:2026 specify?
EN ISO 8980-3:2022/A1:2026 modifies the European Standard EN ISO 8980-3:2022 for uncut finished spectacle lenses. Its focus is the transmittance properties of lenses, including attenuation of solar radiation, and the way those properties are claimed, measured, and declared.
The amendment changes the scope wording, adds a new defined term, introduces a new requirement for claimed wavelength cut, updates measurement uncertainty rules and instrument conditions, revises the information supplied by the manufacturer or supplier, and adds informative Annex G.
What are the key requirements of EN ISO 8980-3:2022/A1:2026?
EN ISO 8980-3:2022/A1:2026 mainly tightens how wavelength cut claims are made and verified, and it gives more specific measurement conditions. For a reader, the practical effect is that a claim is not just a label - it needs supporting measurement under defined conditions.
Claimed wavelength cut
Clause 6.7 says that when a lens is claimed to have a specific wavelength cut, the claim has to meet the stated requirement for the nominated wavelength. In practice, this means the supplier needs measured spectral transmittance data that support the advertised cut-off value.
For such lenses, the spectral transmittance measured according to 7.2 must be below 5.0% at the nominated wavelength, and below 1.0% for all wavelengths from 280 nm up to 10 nm shorter than that wavelength. After ultraviolet irradiation as specified in 7.7, the claimed performance still has to be satisfied. That matters because the claim must remain valid after a durability-type exposure.
Measurement uncertainty
Clause 7.2.1 replaces the uncertainty limits for spectral transmittance measurements. The amendment sets separate limits above 20%, in the range from 20% down to 5%, and below 5%, all at a 95% confidence level. In practice, labs need to check that their method and instrument can meet these uncertainty levels before using the results for claims or acceptance.
Test method for wavelength cut claims
Clause 7.2.2 requires a spectrophotometer or equivalent device capable of spectral transmittance measurement with relative uncertainty at or below 10% and wavelength uncertainty within ±1.0 nm. The spectral resolution must not exceed 1 nm, the instrument must operate from 280 nm to 780 nm, and the spectral bandwidth must not exceed 2 nm FWHM. This is what keeps results comparable between instruments and avoids over-reading a lens cutoff.
The lens used for the measurement is a plano lens of 2 mm thickness, unless another thickness is stated. The measurement is made at the reference point with the beam normal to the front surface. For a test lab, this fixes the sample setup and reduces variation caused by geometry.
Information supplied with the lens
Clause 8 broadens how required information may be supplied. The manufacturer or supplier may provide it on the package, in an accompanying document, or in other separate information, including digital forms such as a QR code or data matrix code. The declared information now includes claimed absorption or transmittance properties in accordance with 6.6 and/or 6.7.
Annex G
Annex G gives background on why lens geometry and spectrophotometer configuration affect wavelength cut results. It explains, in practical terms, why the specified thickness, wavelength range, and instrument characteristics are needed for fair comparison.
What terms does EN ISO 8980-3:2022/A1:2026 define?
Wavelength cut - the lowest wavelength at which the spectral transmittance rises to a specified level.
Spectral transmittance - the amount of light transmitted at each wavelength, which is the basis for the wavelength cut claim.
Visual attenuation coefficient - the calculated measure referenced in Clause 7.3 for describing how the lens reduces visible light.
FWHM (full width at half maximum) - the spectrophotometer bandwidth limit used to control the sharpness of the measurement.
UV (ultraviolet) irradiation - the exposure used in the verification step to check that the wavelength cut claim remains valid.
Plano lens - a lens used in the measurement setup with no optical power, here specified at 2 mm thickness unless otherwise stated.
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