Things you Did Not Know about your EYES...
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Few people could argue that without our 5 senses life would be pretty dull.
All our senses are extremely important but I think if you asked most people
which sense would they least like to lose they would probably say their
vision.
As with most of our abilities, our vision is something that many of us take
for granted. If you stop and think for a moment, you will realize that just
about everything we do in our day to day life involves our vision. During
this article I am going to try and see if I can get you to start thinking a
little bit more about your eyes. Listed below is my top 10 list of weird
and wonderful things you didn't know about your eyes..
*10. Everyone needs reading glasses as they get older*
This is assuming that you already have perfect distance vision. If you are
currently reading this article and are under 40 years of age with perfect
distance vision, I can say with absolute certainty that you will need
reading glasses at some point in the future. For about 99% of the
population the age that you will first start needing reading glasses is
between 43 and 50 years old. This is because the lens in your eye slowly
loses its focusing ability with age. In order to focus things near to you,
your lens has to change from a flat to a more spherical shape and it loses
the ability to do this as you get older. As you get to around 45 years old
you will start to hold things further away from you to keep them focus.
*9. The lens in your eye is quicker than any camera lens*
Just behind the pupil sits the eyes natural lens, whose function is to
focus on the object you are looking at. Just take a minute to glance around
the room and think about how many different distances you are focusing at.
Every time you do this, the lens in your eye is instantly changing focus
without you even being aware of it! Compare that with a camera lens which
takes a few seconds to focus between one distance and another. Just be
thankful that the lens in your eye is as quick as it is, otherwise things
would be continually going in and out of focus.
*8. Your eyes are fully developed by the age of 7 years old*
By the age of 7 years old our eyes are fully developed and are
physiologically the same as adult's eyes. It is for this reason that it is
vitally important to pick up a lazy eye before we reach this age. The
earlier a lazy eye is diagnosed, the greater the chance it will respond to
treatment, as the eyes are still developing and capable of an improvement
in vision. Beyond 7 years old no amount of treatment will result in any
improvement in vision.
*7. You blink approximately 15,000 times each day*
Blinking is a semi- involuntary function meaning we do it automatically,
but can also choose to blink if we so require. Blinking is an extremely
important function of your eyes as it helps remove any debris on the
surface of your eye, by spreading fresh tears over them. These tears help
to nourish your eyes with oxygen and also have important anti bacterial
properties. You can think of the function of blinking as being similar to
the action of the windscreen wipers on your car, cleaning and removing
everything to keep you seeing clearly.
*6. Everyone gets cataracts as they get older*
People don't realize that cataracts are just a normal consequence of
getting older and everyone gets them at some point in their life. You can
think of cataracts as being similar to getting grey hair, in that it is
just a normal natural age change. The average age people first get
cataracts is about aged 70 years old and by 80 years old you are guaranteed
to have cataracts. In the same way that you could not find any aged 80
years old without grey hair, it would be equally impossible to find anyone
over 80 years old without cataracts. Cataracts refer to a gradual clouding
of the lens in your eye and typically take about ten years from onset to
them needing treatment.
*5. Diabetes is often first detected during an eye test*
People who suffer from type 2 diabetes (the type you develop later in life)
are often symptom free, meaning they often don't even know that they have
it. This type of diabetes is commonly picked up during an eye test as it
can be seen as tiny hemorrhages from leaking blood vessels at the back of
your eye. This certainly is good reason to get your eyes tested regularly.
*4. You see with your brain and not your eyes*
The function of your eyes is to collect all the required information about
the object you are looking at. This information is then passed from your
eye to the brain via the optic nerve. It is the brain (visual cortex) where
all this information is analyzed to enable you to 'see' the object in its
finished form. This is not to say that your eyes don't play an important
role as they certainly do.
*3. Your eyes can adapt to blind spots in your vision*
Certain eye conditions such as Glaucoma and certain general health
conditions such as having a stroke, can lead to you developing blind spots
in your vision. This would be extremely debilitating if it wasn't for your
brain and your eyes ability to adapt to make these blind spots disappear.
It does this by suppressing the blind spot in your affected eye and letting
your other good eye 'fill in the gaps'. It is adaptation like this that
makes your eyes so resilient.
*2. 20:20 vision is not the best vision you can have*
When people hear the phrase 20:20 vision they assume that this is the best
vision possible. However this is not true as 20:20 vision refers to what
the average adult should be able to see. If you imagine a typical eye test
chart the 20:20 vision is probably only the line second from the bottom.
The line below it is even smaller than 20:20 vision and would mean you have
20:16 vision. So don't be so impressed next time someone tells you they
have 20:20 vision!
*1. Your eyes water when they are dry*
I know this might sound crazy but this is one of strange facts about your
eyes. Your tears are made up of 3 different components and they are water,
mucus and fat. If these 3 components are not in exactly the right
quantities, your eyes can become dry as a consequence. Your brain responds
to this dryness by producing extra water and hence your eyes water.
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