Colourimeter research data determines certain specific tints can help migraine sufferers whose migraines are triggered by pattern glare.
Tints can have a fashion purpose but there are variations in light transmissions due to colour and material and not only just front surface treatments.
Good quality sunglasses should have
1 Waterproof & oleophobic coating
2 Bi-Gradient or other surface mirror or gradient treatments
3 Clearshell scratch resistant treatment
4 Colour enhancing layer
5 Polarisation layer
6 Colour enhancing layer
7 Clearshell scratch resistant treatment
8 Anti-Reflective coating
9 Waterproof & oleophobic coating
The original Sid the Seagull Cancer Council message imploring us to not only to slip on a shirt, slop on the sunscreen and slap on a hat,now includes to seek some shade and last but not least to slide on the sunnies.
Indeed the standard recommendation is five forms of sun protection; sunscreen, clothing, hats, shade and sunglasses.
Australia has one of the highest levels of UV exposure and skin cancer in the world.
You can still get burnt on cool or cloudy days from from UVB and HEV (high energy visible)though lower energy than UVA rays, they penetrate deeply into the eye and can cause retinal damage.
Transitions lenses are often used for their automatic light changing photochromic performance in the presence of ultraviolet (UV) radiation, such as when exposed to sunlight,indoors and at night.
Like skin, our eyes need sun protection. Damage is often spotted in eye exams and can contribute to vision problems.
Photochromic performance is influenced by temperature uv exposure and lens material and can vary among brands
Transitions lenses provide UV400 protection, % reduction of 100 UVA and UVB ,helping to preserve your long-term eye health.
UVA are the most prevalent and penetrating rays during all daylight hours throughout the year causing wrinkles, sun spots,skin cancer
UVB causes more sunburn but more prevalent in the middle of the day
UVC rays are absorbed by the ozone layer and generally don’t reach the earth’s surface. there are germicidal disinfectant uses of man-made UVC radiation such as in hospital settings.
There is a mandatory safety standard for sunglasses and fashion spectacles in Australia. Since 1 July 2019, all sunglasses and fashion spectacles, including uniformly tinted, polarizing, photochromic and gradient tinted lenses sold in Australia must be tested and labelled according to the Australian/New Zealand Standard for Sunglasses and Fashion Spectacles (AS/NZS 1067:2016 Eye and face protection: Sunglasses and fashion spectacles).
For outdoor workers, tinted eye protectors are available that meet the Australian standard for occupational eye protectors (AS/NZS 1337 Personal eye protection: Eye and face protectors for occupational applications) and provide UVR protection and reduced glare outdoors. Untinted eye protectors marked ‘O’ also have sufficient UVR protection for outdoor use. Eye protectors are not assessed for their suitability for driving.