Myopia
is a very common eye condition and sometimes referred to as
nearsightedness or short-sightedness because objects in the distance
become blurry and closer objects are perfectly clear. Myopia comes in
several forms of severity, from mild, which may not need treatment,
to serious cases that affect the vision substantially. An appointment
with the optometrist should be made if distant objects become
slightly fuzzy or you have trouble bringing objects at a distance
into focus.
School
myopia develops in adolescence around the school age, hence the term,
this problem can stabilize in the teen years. Adult onset myopia
commonly starts around puberty slowly worsening until the eye is
fully developed. Late onset myopia happens in adults around the age
of forty and onwards. Myopia affects over 128 million North Americans
and 1.6 billion people globally, and still rising.
What
is the cause of myopia?
A
refractive eye condition is when the structure of the eye has errors
which cause how light rays enter the eye. The eye grows with the rest
of the body and sometime the back of the eye can grow too long, which
stops light rays reaching the retina and causing distant objects to
blur. Myopia is associated with genetics or several environment
factors.
Environment
factors causing myopia in children include:
Excessive close up work
Poor quality illumination
Lack of outdoor activity
Font size in print
books
Very poor eye care
Uncorrected refractive errors
Unhealthy diet
Children
should be encouraged to participate in more outdoor activities,
giving them longer breaks, more often from close work, which could
help prevent the onset of myopia.
The
IMPA (International Myopia Prevention Association) suggest that if
children start to wear reading glasses for close work as soon as the
first signs of myopia appear, it could prevent the problem from
deteriorating further. Equally, new studies from a distinguished
vision scientist called David Troilo, has proposed the introduction
of contact lenses that can be used to aid the growth of children's
eyes using multi-zonal lenses with alternating rings of negative and
positive focal lengths. This, he suggest, can stop the progression of
myopia in young adolescence.
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