It is vital to protect skin and eyes from the damaging effect of the sun because exposure to ultraviolet radiation contributes to ageing skin and is the main cause of skin cancer. Some people may need to take particular care because of photosensitivity.
No matter what the weather, or what you are doing, cover up! Take particular care in summer – between September and May in New Zealand – especially between 11 am and 4 pm. Make sure your children are protected as well as yourself.
You should also be careful to protect your skin if you are at high altitude in any season, particularly when in the snow because it reflects extra ultraviolet radiation onto your skin.
The maps below demonstrate the variation in ultraviolet radiation according to the time of day and cloudiness in mid-summer, and the variation according to the time of year. The 15-minute and 30-minute burn times are also shown.
In recent years, publication of the Global Solar Ultraviolet Index has become the standard way to determine the risk of sunburn.
It has been demonstrated that the daily dose of sun-burning ultraviolet can exceed the threshold for damage to fair skin .
A little sun exposure is necessary for the production of vitamin D, which is essential to balance calcium levels and to make strong bones. However, regular use of sunscreens does not result in vitamin D deficiency in Australasia.
McKenzie RL, Lucas RM. Reassessing Impacts of Extended Daily Exposure to Low Level Solar UV Radiation. Sci Rep. 2018 Sep 14;8(1):13805. doi: 10.1038/s41598-018-32056-3. PubMed PMID: 30218096. Journal.
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© 2018 DermNet New Zealand Trust.
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