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Eyes

An extreme close-up of an eye.
The commonest problem that teenagers are going to have with their eyes is not being able to see properly because what they are looking at is a bit out of focus. It is not that your eyes are either 'bad' or 'good' it is simply whether you can see clearly or not. The main reason why young people do not see clearly is due to the length and shape of their eyeballs and whether the picture of the outside world that comes through the lens in their eyes is properly focused on the light sensitive nerves in your retina at the back of their eyes.
 

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