Millions of contact lens users are at risk of eye-devouring amoeba that can turn them blind

วันอาทิตย์ที่ 9 กันยายน พ.ศ. 2555


The Raelian Movement
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http://www.dailymail.co.uk/health/article-2199343/Contact-lens-wearers-mercy-bug-tap-water-gnaws-eyeballs-causing-blindness.html

Millions of contact lens users are at risk of eye-devouring amoeba that can turn them blind

  • Acanthamoeba parasite found in tap water, dust and swimming pools
  • Causes painful infection that is 'potential problems for ever single contact lens wearer'
  • Can eat its way through the cornea and even cause blindness
Contact lens wearers are at the mercy of a bug that is found in tap water and gnaws through the eyeballs causing blindness, scientists have warned.
With the Acanthamoeba parasite also found in dust, in the sea and in showers and swimming pools, millions of people are at risk worldwide, including Britain's 3.7million contact lens users.
The actual number of infections is small but treatment is long, painful and not completely effective, meaning some Britons are left blind every year.
Fiona Henriquez, of the University of the West of Scotland, said: 'It is a potential problem for every single contact lens wearer.' 
Professor Craig Roberts, of the Strathclyde University, who is working with Dr Henriquez to produce better contact lens cleaning solutions, said: 'It's absolutely everywhere.' 
The British Science Festival in Aberdeen heard that Acanthamoeba, a tiny single-celled parasite, feeds on bacteria found on dirty contact lenses and cases.
When the lens is put in the eye, it starts to eat its way through the cornea, the outer layer of the eyeball and breeding as it goes.
 
Symptoms of include itchy and watery eyes, blurred vision, sensitivity to light, swelling of the upper eyelid and extreme pain.
Culprit: The Acanthamoeba parasite that lives in tap water and dust
Culprit: The Acanthamoeba parasite that lives in tap water and dust
Vision can be permanently damaged within a week, said Graeme Stevenson, an optician.
'Generally it leaves you with scarring. Your cornea is your window on life and if the infection penetrates in towards the third layer you are left with scarring, with a kind of frosty windscreen.' 
He added that many of the 75 infections recorded each year in the UK occur because people fail to follow the instructions they are given by their optician.
'Usually a lot of it is non-compliance. It's patients rinsing their case out in tap water or rinsing their lenses out in tap water. Potentially something as simple as swimming or showering while wearing their lenses increases the risk significantly.' 
Treatment includes Dettol-like eye drops, with patients initially being treated every 20 minutes, day and night and spending up to three weeks in hospital. The most severe cases are given cornea transplants.
Advice for avoiding the bug includes keeping lenses and cases clean and replacing them regularly.
The affect of Acanthamoeba on the eye of a contact lens wearer
The affect of Acanthamoeba on the eye of a contact lens wearer
The British Contact Lens Association advises against wearing contact lenses while swimming, unless goggles are also worn. And if contact lenses are kept in while showering, eyes should be tightly closed.
Dr Tara Beattie, of Strathclyde University, said: 'Millions of people wear lenses and don't have a problem. We don't want people thinking "we can't wear lenses any more".
'That's not the case but what they need to do is be diligent about keeping them clean.' 


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"Ethics" is simply a last-gasp attempt by deist conservatives and
orthodox dogmatics to keep humanity in ignorance and obscurantism,
through the well tried fermentation of fear, the fear of science and
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WARNING FROM RAEL: For those who don't use their intelligence at its
full capacity, the label "selected by RAEL" on some articles does not
mean that I agree with their content or support it. "Selected by RAEL"
means that I believe it is important for the people of this planet to
know about what people think or do, even when what they think or do is
completely stupid and against our philosophy. When I selected articles
in the past about stupid Christian fundamentalists in America praying
for rain, I am sure no Rael-Science reader was stupid enough to
believe that I was supporting praying to change the weather. So, when
I select articles which are in favor of drugs, anti-semitic,
anti-Jewish, racist, revisionist, or inciting hatred against any group
or religion, or any other stupid article, it does not mean that I
support them. It just means that it is important for all human beings
to know about them. Common sense, which is usually very good among our
readers, is good enough to understand that. When, like in the recent
articles on drug decriminalization, it is necessary to make it
clearer, I add a comment, which in this case was very clear: I support
decriminalizing all drugs, as it is stupid to throw depressed and sad
people (as only depressed and sad people use drugs) in prison and ruin
their life with a criminal record. That does not mean that there is
any change to the Message which says clearly that we must not use any
drug except for medical purposes. The same applies to the freedom of
expression which must be absolute. That does not mean again of course
that I agree with anti-Jews, antisemites, racists of any kind or
anti-Raelians. But by knowing your enemies or the enemies of your
values, you are better equipped to fight them. With love and respect
of course, and with the wonderful sentence of the French philosopher
Voltaire in mind: "I disapprove of what you say, but I will defend to
the death your right to say it".