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BSI PD ISO/TR 20772:2018

BSI PD ISO/TR 20772:2018

$167.15

Ophthalmic optics. Spectacle lenses. Short wavelength visible solar radiation and the eye

Published By Publication Date Number of Pages
BSI 2018 36
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This document describes visible solar radiation with wavelengths close to the UV range, its transmission to, within and the effects on the human eye. The wavelengths concerned are from 380 nm to 500 nm, covering the colours of violet, indigo and blue — often referred to as the “blue wavelengths”.

It also explains the filtering effects and measurement of spectacle lenses and sunglasses, thereby providing background information to understand the transmittance requirements related to filtering effects of lenses and filters in the available spectacle lens and sunglass standards.

This document does not address the issues of protection from artificial sources of radiation.

This document is intended to be of benefit to any future interest in ISO standardization related to transmission of solar radiation with wavelengths near to and greater than 380 nm.

The Bibliography provides a source of relevant useful references.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Preliminaries: UV400 and alpha-blocking wavelength in standardization
11 5 Solar radiation and exposure of the eye
5.1 Solar radiation and the earth’s atmosphere
13 5.2 Geometrical factors
5.2.1 General
5.2.2 Exposure and solar altitude
14 5.2.3 Reflection from surfaces
5.2.4 Exposure of the eye and its response to bright light
15 5.2.5 Peripheral light focusing effects
16 5.2.6 Irradiation of the retina
17 6 Physiological effects on the eye
6.1 Hazards to the eye
6.2 Retinas of children’s eyes
18 6.3 Retinal blue phototoxicity
6.3.1 General
19 6.3.2 Blue light in solar radiation
6.3.3 Eye media transmittance
6.3.4 Sunlight irradiance reaching the retina
6.4 Retinal studies
6.4.1 General
20 6.4.2 Phototoxic effect near 405 nm
6.5 The mechanisms of retinal damage
21 6.6 Blue light & non-visual functions
6.7 Blue light transmittance of spectacle and sunglass lenses
6.7.1 Existing standards requirements for claims regarding blue light transmittance
22 6.7.2 Relevant spectral bandwidth and transmittance characteristics
6.7.3 Effects of blue light filtering on clear lenses
6.7.4 Effects of blue light filtering on tinted lenses
7 Spectral weighting functions
7.1 General
23 7.2 ICNIRP 2013
24 7.3 Application of ICNIRP specifications to standards for spectacle lenses and sunglasses
25 8 Filtering materials and measurement
8.1 General
8.2 Materials for lenses and filters, including special treatments for filter properties
26 8.3 How the physical properties of lenses/filters affect transmission, reflection, and absorption of solar radiation
27 8.4 Measuring spectral transmittances
8.4.1 Principles of the measurements
28 8.4.2 Factors important to the accuracy of measurement
9 Summary
29 Bibliography

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BSI PD ISO/TR 20772:2018
$167.15