02.Sunglass classifications
A five-category classification method identifies sunglasses and fashion spectacles by their performance in certain conditions and suitability for use. Under AS/NZS 1067:2003, sunglasses and fashion spectacles are classified as one of the following:
Lens category 0: Fashion spectacles
These are not sunglasses, as they have a very low ability to reduce sun glare. They provide limited UV protection.
Lens category 1: Fashion spectacles
Like category 0 lenses, these are not sunglasses; however, they do provide limited sun glare reduction and UV protection. Fashion spectacles with category 1 lenses are not suitable for driving at night.
Lens category 2: Sunglasses
These sunglasses provide a medium level of sun glare reduction and good UV protection.
Lens category 3: Sunglasses
Similar to category 2, these sunglasses provide a good level of UV protection. Lens category 3 glasses also provide a high level of sun glare reduction.
Lens category 4: Sunglasses
These are special purpose sunglasses that provide a very high level of sun glare reduction and good UV protection. Lens category 4 sunglasses must not be used when driving at any time.
In addition to the five category classifications above, the mandatory standard also covers the following:
Photochromic lenses
Also known as variable tint lenses, photochromic lenses may not be suitable for night driving, depending on their transmittance properties (i.e. their ability to reduce sun glare and level of UV protection).
Non-conforming lenses
Non-conforming lenses have the ability to alter a person’s colour recognition, and in particular the detection of traffic light colours. In some cases these lenses must not be used when driving.