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BS EN ISO 8980-3:2022 – TC

BS EN ISO 8980-3:2022 – TC

$246.62

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

Published By Publication Date Number of Pages
BSI 2022 112
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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
66 undefined
69 European foreword
Endorsement notice
74 Foreword
76 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
77 5 Classification
6 Requirements
6.1 General
6.2 General transmittance requirements
6.2.1 Tint descriptions, categories, and UV transmittance requirements
78 6.2.2 Tolerances on luminous transmittance of tinted lenses
79 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
80 6.4.2 Polarizing spectacle lenses
81 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
82 7 Test methods
7.1 General
7.2 Spectral transmittance
7.3 Luminous transmittance and relative visual attenuation coefficient (quotient)
83 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
86 7.5.3 Determination of transmittance
87 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
88 7.7 Determination of resistance to ultraviolet radiation
7.7.1 Principle
7.7.2 Reference apparatus
89 7.7.3 Procedure using reference apparatus
8 Identification
91 Annex A (normative) Spectral data for calculating relative visual attenuation quotients for incandescent signal lights
96 Annex B (normative) Calculation of solar UV and blue-light transmittance values
98 Annex C (normative) Cut-on filter for UV filtering
102 Annex D (informative) Spectral radiation risks
103 Annex E (informative) Transmittance equations in summation form
107 Annex F (informative) Example of the calculation of luminous transmittance, τV
109 Bibliography

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BS EN ISO 8980-3:2022 - TC
$246.62