Infrared uses

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UV index readings of 11 and above are considered extreme, while those between eight and 10 are considered very high. When UV index readings are in either band, the NEA advises extra protection against sunburn.

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Infrared waves examples

But excessive exposure to UV radiation can cause acute effects such as sunburn, as well as phototoxic and photoallergic reactions, while the chronic effects of excessive UV radiation include skin cancers such as melanoma and eye conditions such as cataracts.

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According to the NEA, it is common for the UV index to reach very high and extreme levels between 11am and 3pm on a day with little cloud cover.

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Dr Heng said that since 2011, the US Food and Drug Administration has banned the use of the term “sunblock”, in addition to other descriptions such as “waterproof” and “sweatproof”, claiming that such terms overstate the effectiveness of such products.

Research shows that between five and 30 minutes of sun exposure twice a week can be healthy as it allows the skin to produce vitamin D, which the body needs to absorb calcium and maintain its bone structure.

Infrared wavelength range in nm

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“While skin cancer is less common among people with darker skin, studies have shown that they tend to be diagnosed later and at a worse stage, which is more challenging to treat,” said Dr Heng.

“The protection from SPF 30 is about 97 per cent, whereas that from SPF 50 is only slightly more, at 98 per cent,” he said.

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Infrared wavelength

Dr Tan Kian Teo, a dermatologist with Skin Physicians, recommends getting a sunscreen with broad spectrum protection against UVA and UVB radiation, in addition to blue light if possible.

The US-based Centre for Surgical Dermatology suggests that chemical sunscreen may provide more complete UV protection than physical sunscreen, adding that it is more effective at resisting water and sweat.

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Regarding the type of sunscreen to use, Dr Heng said: “The higher the SPF, the better protection it will offer against UVB radiation.”

NEA advises those who are outdoors to take protective measures to guard against UV exposure by using umbrellas and wearing hats and sunglasses, as well as applying sunscreen of at least SPF 30 and reapplying it every two hours.

Infrared waves

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Said Dr Heng: “Sunscreen is a topical product containing chemicals that are first absorbed by the skin, and then it absorbs UV radiation by converting it into heat, preventing it from damaging the skin.”

“Overexposure to UV radiation can cause damage to the skin and eyes, and suppress the immune system,” said dermatologist Heng Jun Khee from DermAlly Specialist Skin Clinic and Surgery.

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Dr Heng said the sunscreen should also be water-resistant, to ensure it remains on wet or sweaty skin for some time before it needs to be reapplied.

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The National Environment Agency (NEA) dished out the same advice, after the ultraviolet (UV) index hit extreme levels in late March.

It should also be reapplied every two hours in a setting of ongoing sun exposure or immediately after swimming or sweating.

Infrared frequency

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Infrared dangers

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Dr Heng said: “If you have sensitive skin, choose a physical sunscreen, as it is less irritating than chemical sunscreen.”

These physical or mineral sunscreens typically contain zinc oxide and titanium dioxide – naturally occurring minerals which provide broad spectrum protection and which sit on the surface of the skin, rather than get absorbed by the skin – that reflect UV radiation away from the body.

UVB radiation causes sunburn as well as melanoma and other types of skin cancer, while UVA radiation – together with blue light, which is part of the visible light spectrum – is more closely associated with skin ageing.

However, Dr Heng said many dermatologists recommend using a sunscreen of SPF 50 or greater to provide better protection against UV radiation, as not many people apply the correct amount of sunscreen or reapply it when needed.

The UV index – which describes the level of solar UV radiation on the earth’s surface on a scale of zero to 15 – hit 12 at about 12.45pm on March 27.

“To achieve the SPF labelled on a sunscreen bottle, you need to apply two to three finger lengths’ worth, which is equivalent to half a teaspoon, to the face and neck,” she said.

Dr Tan said that beyond applying sunscreen, people should avoid outdoor activities between 10am and 4pm, when the sun is at its strongest.

Chemical sunscreen typically contains one or more chemicals such as oxybenzone – an organic compound which absorbs UVA rays – or octocrylene, which absorbs UVB and short-wave UVA radiation.

Infrared light

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“Apart from using a sunscreen, one can consider wearing hats with broad brims and clothes that provide a physical barrier against the sun,” he added.