INTERNATIONAL NORMS
- European Norms - EN 1836-1997
- American Standards - ANSI Z80.3 - 1996
- Austrailian Standards - AS 1067.1 - 1990
- Canadian Standards - CSA Z94.5 - 1995
OPTICAL POWERS
Different measuring methods are used to determine the Prismatic power by different Standards.
The permissable optical power values for unmounted oculars and oculars mounted in spectacles are:
LUMINOUS TRANSMITTANCE SPECIFIED ENVIRONMENT
Ratio of visible light transmitted by the filter between 380 nm to 780 nm.
Different measuring methods are used by different Standards.
| EN1836
1997 |
ANSI
Z80.3 1996 - CSA Z94.5 -95 |
AS1067.1
1990 |
| tv |
Filter
Category |
tv |
Primary
Function |
tv |
Primary
Function |
| 80
- 100% |
0 |
>
40% |
Cosmetic
lens or shield, light |
>
50% |
Fashion
spectacles |
| 43
- 80% |
1 |
8
- 40% |
General
purpose lens or shield medium to dark |
8
- 50% |
General
purpose sunglasses |
| 18
- 43% |
2 |
3
- 8% |
Special*
purpose lens or shield, very dark |
3
- 25% |
Specific
purpose sunglasses type (a) |
| 8
- 18% |
3 |
>
3% |
Special*
purpose lens or shield, strongly color |
>
3% |
Specific
purpose sunglasses type (b) |
| 3
- 8% |
4 |
|
*
does not meet the requirements of transmittance properties related to traffic
|
type
(a) |
For
protection against very intense sun glare |
|
|
|
|
type
(b) |
For
protection against UV radiation in sunlight for specified |
ROAD USE AND DRIVING
Filters suitable for road use and driving shall be in accordance with specific requirements:
Spectral Transmittance EN and ANSI shall be > 8% for all the norms.
EN also spectral transmittance between 500 nm to 650 nm > 0,2 x tv.
Recognition of Signal Lights:
| EN 1836 |
ANSI Z80.3 |
| Relative visual attenuation quotient Q |
Traffic Signal Transmittance |
| > 0,80 RED signal light |
> 8% RED signal |
| > 0,80 YELLOW signal light |
> 6% YELLOW signal |
| > 0,60 GREEN signal light |
> 6% GREEN signal |
| > 0,40 BLUE signal light |
fulfil the color limit region |
The Standards have different test methods and requirements and in some cases the methods are not in accordance. So, it can happen that a filter can fulfil a standard and cannot pass others.
Polarization: standards
EN1836
- Where sunglasses are fitted with polarizing filters,
these shall be fitted in the frame so that the plane
of polarization does not deviate from the horizontal
direction more than plus or minus 5°. The misalignment
between the plane of polarization of the left and
right filters shall not be greater than 6°.
ANSI, CSA and AS
- These standards do not specify any requirement.
