1 Agustus 2010

Why Do I Blink?

Your eyes make tears all the time. Not only when you cry. Blinking spreads the tears across your eyes and stop them from drying out and getting sore.

Eyelashes help to stop things like dust and grit getting into your eyes.
A blink lasts for about one-third of a second. You do it thousand of times a day.
The black hole in the middle of the eye is called the pupil.
The iris is the coloured part of your eye. It works rather like curtains on a window-when it's too dark to see, the iris opens to let it more light. When the light is too bright, the iris tightens up to protect the eye.
Jelly-like stuff in your eyeball keeps it in shape, like air in a balloon.

Reference: Brigid Avison (I Wonder Why Book)

Vocabularies:

* tears : air mata
* blinking:berkedip
* spread: menyebar
* sore : sakit/perih
* Eyelashes: bulu mata
* dust:debu
* grit : pasir
* tightens up : menyempit
* eyeball : bola mata

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