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Your eyes and sunshine  (what u should know about uv)

10/24/2013

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We all recognise the importance of sunlight as well as the adverse affects of overexposure to it.  Exposure to sunlight is crucial for general health, in particular vitamin D synthesis and pineal function regulation (our sleep-wake cycle, circardian rhythm, time perception etc).

To develop and function properly adequate lighting is very important for our eyes.  Children who spend some time outdoors on a regular basis have reduced rates of certain eye conditions, for example short-sightedness.

So, what happens when our eyes get too much sunshine?

The main reason our eyes and skin are damaged from sun exposure is ultra-violet radiation, generally referred to as UV.  UV is emitted from the sun in rays as visible light is but we can’t see it (because our retina can’t detect rays of that “wavelength”).  A number of changes, in the short and long term, can occur to our eyes when they have too much UV exposure. 

Short term effects (that can continue if exposure isn’t reduced) can include painful, red, watery eyes and feeling like there is sand in the eye.  In extreme cases photokeratitis (‘light’ induced inflammation of the cornea) occurs.  Depending on the means of acquisition, photokeratitis can be called welders flash or snow blindness. 

In the long term over exposure to UV is linked to earlier cataract formation, tumours of the eyelid and pterygium development.  There may also be a link between sun damage and macula degeneration – research is continuing in this area.  It is currently thought that sun related damage to the macula may be related to high end visible light, i.e. blue/purple light (the front of the eye absorbs UV meaning it doesn’t get through to the retina).

It has been well established that limiting the amount of damaging UV rays that get to our eyes improves to ocular health.  The most effective way of doing this is with a pair of sunglasses.  Hats are also an excellent mode of UV protection; they shield parts of our face as well as our eyes but don’t adequately protect our eyes from reflected light.  Another sun smart step to take is avoiding extended exposure to direct sunlight between 10 am and 2 pm.


Pterygium of the right eye.
Cataract
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October 09th, 2013

10/9/2013

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Happy World Sight Day! We would like to thank everyone from around the world who is taking part in the World Sight Day Challenge by making a donation or fundraising - your support is helping to give sight and hope to people in need.

Our Optometrist Hannah McGowan, reached her goal on Sunday of completing a half marathon. We congratulate her on her achievement and Scenic Rim Optometrists thanks patients for their generous support in supporting this wonderful cause.

This is the latest video shared with you to celebrate World Sight Day. You'll meet 3 primary school children who got their first eye exams and glasses in August thanks to a School Screening Project in Tanzania that is funded by Optometry Giving Sight.

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