Your eyes are very important so it's important that you take care of them.

The average eyeball is only 2.5 cm in diameter but yet it can do so much.

If a person has normal vision this is called 6/6 (or 20/20 back-in-the-day).

Short-sighted (myopia): If you are short-sighted then this means you can see close up but far away things become blurry. This is because the eyeball is too long.

Long-sighted (hypermetropia): If you are long-sighted then this means you can see far away but not things become blurry when close up. This is because the eyeball is too short.

Get your eyes checked out if your vision becomes blurred, if you get lots of headaches, if you find it hard to read the words in a book, and especially if you are squinting to see the TV. It's a good idea to have your eyes checked every couple of years anyway - and eye tests are free for Scottish residents. 

If you smoke then you are more at risk of blindness.

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The Eyecare Trust Website - The Eyecare Trust has loads of information on caring for your eyes.