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Home Health&Beauty

Children need more violet light – here’s why

The FINANCIAL by The FINANCIAL
September 13, 2017
in Health&Beauty
Reading Time: 2 mins read
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Children need more violet light – here’s why
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The FINANCIAL — Most people think of myopia – the medical term for short-sightedness – as an inconvenience because the blurred vision it causes is easily corrected with glasses or contact lenses. 

Yet, short-sightedness is a global public health problem, according to Aston University’s Dr Nicola Logan, a senior lecturer in the School of Life and Health Sciences optometry department.

This is because a myopic eye is a longer eye and so the light sensitive part at the back of the eye is stretched, which can lead to a number of eye diseases in later life, such as glaucoma, maculopathy and retinal detachment.

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Experts are also concerned because the number of people with myopia is increasing. Research suggests that by 2050 it will affect half the world’s population.

Myopia normally develops in children and increases in prevalence and amount during the teenage years. About 30 per cent of teenagers in the UK have myopia, and in some East Asian countries around 80 per cent of teenagers have myopia. 

Our visual environment plays a role in myopia development. Lifestyles have changed significantly over the last 50 years, with greater time being spent indoors on computers, tablets and smartphones, according to Aston University.

“The LEDs and fluorescent lights often used in our homes and schools contain little violet light, and violet light does not pass through materials such as the UV-protected spectacles and the glass in windows,” explained Dr Logan. “Research suggests that it is lack of time that children spend outdoors that seems to trigger myopia development.

“The impact of these levels of myopia on all areas of society is enormous due to the cost of eye examinations, glasses and treatment of eye disease. The reasons why myopia develops are not fully understood; the prevalence has increased too quickly to be explained solely by genetics.

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“At Aston University, we are looking for ways to prevent myopia, or, if it has started, at ways to slow its progression.

“Spending greater time outdoors – 90 minutes a day – seems to reduce the risk of developing myopia. Why this works is not clear. The most recent research suggests that it may be the lack of visible violet light indoors that causes the problem and if we spent time outdoors in daylight we are exposed to ample violet light.

“If myopia has already developed, then we can slow progression by using different designs of contact lenses or with atropine eye drops. Atropine eye drops are normally used to temporarily stop the lens inside the eye from focusing and to make the pupil larger. A low dose of atropine eye drops also slows myopia progression without affecting pupil size and the ability to focus, though we are not sure why it works.

“There are options for soft or rigid designs of contact lenses, and both types as well as correcting the blurred distance vision also alter the image in the periphery and this seems to control the growth of the eye.

“All these interventions slow the myopia progression by about 50 per cent. Spending more time outdoors may also help slow down progression of myopia in children.

“We do not have all the answers to why and how myopia develops, but we do have ways we can slow down myopic progression. It is time that we stop just correcting the blurred vision in myopia and start actively managing and controlling it.” 

 

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