Actually they do have to meet a standard as seen below
A Standard for Sunglasses
All sunglasses sold in Australia must be tested and labelled according to the Australian/New Zealand standard AS/NZS 1067:2003 Sunglasses and Fashion Spectacles. This mandatory standard sets limits on the allowed transmittances of fashion spectacles and sunglasses.
Sunglasses meeting the standard are available in adults and children’s sizes. Wearing sunglasses that meet the standard’s requirements for effective sunglasses ensures your eyes have adequate protection against UVR damage.
The standard defines five categories of lenses:
Lens category Description Additional markings
0 Fashion spectacles - not sunglasses very low sunglare reduction - some UV protection NONE
1 Fashion spectacles - not sunglasses limited sunglare reduction - some UV protection NOT SUITABLE FOR DRIVING AT NIGHT
2 Sunglasses - medium sunglare reduction and good UV protection NONE
3 Sunglasses - high sunglare reduction and good UV protection NONE
4 Special purpose sunglasses – very high sunglare reduction and good UV protection MUST NOT BE USED WHEN DRIVING
Sunglasses that comply with the requirements of AS/NZS 1067 shall be labelled to state this compliance. Sunglass lenses in lens category 4 must be marked with the prescribed symbol and the warning "MUST NOT BE USED WHEN DRIVING".
In addition to the AS/NZS 1067:2003 label several other markings may be found on sunglasses. Sunglasses labelled “EPF 10” (Eye Protection Factor rating 10) actually exceed the requirements of AS/NZS 1067. Sunglasses may also be labelled “Absorbs 100% UVR”.
Sunglasses that are to be worn while driving must comply with the colouration limits of AS/NZS 1067. Colours, in particular traffic signals, will still be recognisable when viewed through the lenses.
Guidelines for purchasing sunglasses
Check that the glasses are either sunglasses or special purpose sunglasses and not fashion spectacles.
Check that the sunglasses carry a label that indicates they comply with or exceed the requirements of AS/NZS 1067:2003 or are rated EPF 10.
If the glasses are to be used while driving, then check that colours are easily recognized when viewed through the lenses.
If you purchase sunglasses or fashion spectacles on the internet they should still comply with AS/NZS 1067. There should be clear and legible labelling attached with the identity of the manufacturer or supplier, the lens category number, description and additional markings if applicable. The label should also refer to the AS/NZS 1067.



				
				
				
					
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