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BS EN ISO 8980-3:2022

BS EN ISO 8980-3:2022

$189.07

Ophthalmic optics. Uncut finished spectacle lenses – Transmittance specifications and test methods

Published By Publication Date Number of Pages
BSI 2022 48
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This document specifies requirements for the transmittance properties of uncut and unmounted finished spectacle lenses, including attenuation of solar radiation. This document is not applicable to —    spectacle lenses having specific transmittance or absorption characteristics prescribed for medical reasons, —    products to which specific personal protective equipment transmittance standards apply, and —    products intended for direct observation of the sun, such as for solar-eclipse viewing. NOTE 1    By reference to ISO 21987 and ISO 14889, this document also applies to lenses mounted in spectacles. NOTE 2    Optical and geometric requirements are given for uncut finished spectacle lenses in ISO 8980?1 and ISO 8980?2, and for mounted lenses, in ISO 21987.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 European foreword
Endorsement notice
10 Foreword
12 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
13 5 Classification
6 Requirements
6.1 General
6.2 General transmittance requirements
6.2.1 Tint descriptions, categories, and UV transmittance requirements
14 6.2.2 Tolerances on luminous transmittance of tinted lenses
15 6.3 Spectral transmittance requirements of spectacle lenses intended for driving and road use
6.3.1 General
6.3.2 Spectral transmittance
6.3.3 Daylight use
6.3.4 Driving in twilight or at night
6.3.5 Relative visual attenuation coefficient (quotient) for incandescent traffic signal light detection
6.4 Additional transmittance requirements for special types of spectacle lenses
6.4.1 Photochromic spectacle lenses
16 6.4.2 Polarizing spectacle lenses
17 6.4.3 Gradient-tinted spectacle lenses
6.5 Resistance to ultraviolet radiation
6.6 Claimed UV absorption/transmittance properties
6.6.1 General
6.6.2 Solar UV absorption
6.6.3 Solar UV transmittance
18 7 Test methods
7.1 General
7.2 Spectral transmittance
7.3 Luminous transmittance and relative visual attenuation coefficient (quotient)
19 7.4 Ultraviolet transmittance
7.4.1 Principle
7.4.2 Apparatus
7.4.3 Calculation
7.5 Transmittance properties of photochromic spectacle lenses and photochromic specimens
7.5.1 Test lenses
7.5.2 Apparatus
22 7.5.3 Determination of transmittance
23 7.6 Test methods for polarizing spectacle lenses
7.6.1 Mean luminous transmittance
7.6.2 Polarizing efficiency
7.6.3 Plane of transmission
24 7.7 Determination of resistance to ultraviolet radiation
7.7.1 Principle
7.7.2 Reference apparatus
25 7.7.3 Procedure using reference apparatus
8 Identification
27 Annex A (normative) Spectral data for calculating relative visual attenuation quotients for incandescent signal lights
32 Annex B (normative) Calculation of solar UV and blue-light transmittance values
34 Annex C (normative) Cut-on filter for UV filtering
38 Annex D (informative) Spectral radiation risks
39 Annex E (informative) Transmittance equations in summation form
43 Annex F (informative) Example of the calculation of luminous transmittance, τV
45 Bibliography

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BS EN ISO 8980-3:2022
$189.07